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AIC PM4-PH Meter User Manual

1. Default Value io Seen only with the 16 bit digital output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted Selections available are Fl a active low i e logic 1 OV output logic 0 V output or AH active high i e logic 1 V output logic 0 OV output 5 18 Digital output option BCD start position Display bed Strt Range D iog Default Value amp Seen only with the 16 bit digital output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted This function affects BCD mode only and determines the number of digits to skip when outputting from the display As the output is 16 bit it can output up to 4 BCD numbers Select from amp to number of display digits minus 4 e g for a 6 digit display you may select D to Z if 2 is selected then the four left most digits will be output if set to then the four right most digits will be output 5 19 Digital output option low value Display d 9 Range Any display value Default Value amp Seen only with the 16 bit digital output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted Accepts any valid display value Determines the low scaling point for the 6 S amp mode and has no effect on other modes See example which follows in 5 20 PM4PHMAN 2 0 1 23 of 54 5 20 Digi
2. as C3 6 560 5 0 Reading 5 5 or below relay pulses at maximum frequency Reading 5 4 to 9 5 relay pulses with frequency decreasing as value approaches 9 period increased by 50 at 7 amp compared to minimum period e g if minimum period is 4 seconds the period at 7 8 will be 6 seconds Reading amp or above relay permanently off ad C3 3 C3 C3 wn C3 3 Reading of 5 5 or below relay permanently off Reading of 6 8 to B U relay pulses with frequency decreasing as value approaches 8 period increased by 50 at 7 amp compared to minimum period e g if minimum period is 4 seconds the period at 7 8 will be 6 seconds Reading 8 amp or above relay pulses at maximum frequency 9 12 PI relay on duration Display Ar dr Range 5 8 to 25 2 Default Value 45 Displays and sets the control relay on duration from amp 8 to 25 G seconds If set to G the relay will be disabled The duration should be long enough to ensure that the device being controlled receives an acceptable on pulse PM4PHMAN 2 0 1 51 of 54 9 13 Setting up the PI frequency controller 1 Set the Aa GPE F function to ArFr 2 Set the control setpoint Ax SP to the required setting 3 Set the control span ckr SPAR to the required setting 4 Set the proportional gain Axv P3 to an arbitrary value e g G 58G 5 Set the integral gain Av 9 to G GGG i e off 6 Set the low and high integ
3. Note if the dual analog output option is fitted only the first of these outputs can be configured for PI control When this function is set to an the following associated functions will appear 5 amp amp E SPR CPS C Pa C39 CO L H CF et and FEE SPRE These functions are not detailed in this manual Refer to the separate PM4 Panel Meter Optional Output Addendum booklet for description of the analog PI control functions and wiring details 5 38 Remote input function Display Po nP Range NONE Paid d Hid W La SP Ac Na Aec or duit Default Value MONE Remote input function When remote input terminals are short circuited via a switch relay keyswitch etc the instrument will perform the selected remote input function A message will flash e g P Hid to indicate which function has been selected when the remote input pins are short circuited The remote input functions are as follows e NONE no remote function required i e activating the remote input has no effect 28 of 54 PM4PHMAN 2 0 1 e P Hid rate peak hold The display will show the peak rate value highest positive value only whilst the remote input terminals are short circuited i e the display value can rise but not fall whilst the input terminals are short circuited The message P Ht d will appear briefly every 8 seconds whilst the input terminals are short circuited to indicate that the peak hold function is active e d Hid rate display hold The rate
4. cause the peak memory value to be displayed the next operation will give a valley memory display PH or Pte will flash before each display to give an indication of display type 5 40 Input type Display PPE EYPE Range PH or OF Default Value PH Displays and sets the input type to be used Choices available are PH pH electrode input or GFP ORP Redox electrode input 5 41 Access mode Display ACC Range DFF ERSY AGNE ALL or CAL Default Value GFF Access mode the access mode function ACES has five possible settings namely DFF EASY NONE ALL and CAL If set to GFF the mode function has no effect on alarm relay operation If set to ERSY the easy alarm access mode will be activated for access to alarm relay setpoints Refer to Easy alarm relay adjustment access facility page 15 If set to AGRE there will be no access to any functions via FURIE mode entry via AL mode must be made to gain access to alarm and calibration functions If set to ALL then access to all functions including calibration functions can be gained via FURIE mode If set to TAL then the easy alarm access mode will be activated but in this instance it allows easy access to alarm setpoints and calibration functions CAL CAL2 and UCAL 5 42 Setpoint access mode Display SPRE Range ALAR t 2 etc Default Value Fi Setpoint access seen only if more than 1 relay fitted Sets the access via FUNE mode and easy alarm access mode
5. except relay 1 may be programmed to operate with an independent setpoint value or may be linked to operate at a fixed difference to another relay setpoint known as trailing operation The operation is as follows Alarm 1 R is always independent Alarm 2 RZ may be independent or may be linked to Alarm 1 Alarm 3 R3 may be independent or may be linked to Alarm 1 or Alarm 2 Alarm 4 A 4 may be independent or may be linked to Alarm 1 Alarm 2 or Alarm 3 The operation of each alarm is selectable by selecting for example Alarm 4 A4 5P Alarm 4 normal setpoint or AY Alarm 4 trailing Alarm 1 or AH k Z Alarm 4 trailing Alarm 2 or AM k 3 Alarm PM4PHMAN 2 0 1 19 of 54 4 trailing Alarm 3 For trailing set points the setpoint value is entered as the difference from the setpoint being trailed If the trailing setpoint is to operate ahead of the prime setpoint then the value is entered as a positive number and if operating behind the prime setpoint then the value is entered as a negative number Example With Alarm 2 set to trail alarm 1 if A iH is set to IDOD and AZH is set to 5G then Alarm 1 will activate at DOD and alarm 2 will activate at 958 i e 1000 50 If Alarm 2 had been set at 50 then alarm 2 would activate at 450 i e 1000 50 5 10 Alarm relay operation mode e g Ai GPEF etc Display Axr GPEr Range Ax AL or Av kP or Ax Fre Default Value Ax AL Alarm relay operating mode relays 1 and 2 on
6. rated 5A resistive Programmable N O or N C or PI control frequency or pulse width 10 2 Optional outputs Extra Relays Analog Retransmission Digital Retransmission Serial Communications DC Voltage Output PM4PHMAN 2 0 1 Same specs as Relay 1 up to 6 extra relays The standard relay and first optional relay can be programmed for PI control operation if required Available as one three or six extra relays 12 bit isolated 4 to 20mA 0 to 1V or 0 to 10V link selectable Single or dual analog output versions available 4 20mA will drive into resistive loads of up to 8009 Isolated BCD Binary Isolated RS232 or RS485 ASCII or Modbus RTU Isolated 12V 24V standard 5V 10V link selectable rated at 25mA 53 of 54 10 3 Physical Characteristics Bezel Size DIN 48mm x 96mm x 10mm Case Size 44mm x 91mm x 120mm behind face of panel Panel Cut Out 45mm x 92mm 1mm Omm Connections Plug in screw terminals max 2 5mm wire Weight 400 gms basic model 450 gms with option card 11 Guarantee and service The product supplied with this manual is guaranteed against faulty workmanship for a period of two years from the date of dispatch Our obligation assumed under this guarantee is limited to the replacement of parts which by our examination are proved to be defective and have not been misused carelessly handled de faced or damaged due to incorrect installation This guarantee is VOID where the unit has be
7. 21 switching bAr Bargraph low value Any display 5 5 13 21 value bAr Bargraph high value Any display gcc 5 14 4 21 value bAr Bargraph type bAr S dot bAr 5 15 22 YPE d dot C bAF or r dot d3gP Digital output option mode bed b 5EL b nd 5 16 23 Optional by nor b ne d3 DP Digital output option polarity FU o or AH Fla 5 17 7 23 Optional bed Digital output option BCD start 8 fore 5 5 18 23 Skrt position Optional d 9 Digital output option low value Any display 5 5 19 23 Optional value d 37 Digital output option high value Any display gcc 5 20 24 Optional value FEC Analog output option low Any display 5 5 21 24 display value Optional value FECT Analog output option high Any display gcc 5 22 24 display value Optional value FEE Second analog output option low Any display 5 5 23 7 25 Che display value Optional value Optional this function will only be accessible if the relevant option is fitted 10 of 54 PM4PHMAN 2 0 1 FECT Second analog output option Any display gcc 5 24 25 Che high display value Optional value GFSt Calibration offset Any display n a 5 25 25 CAL value CAL i First live input calibration Any display 5 5 20 7 25 scaling point value CALZ Second live input calibration Any display HEDH 527 25 scaling point value drnd Display rounding to 5000
8. 23 88 7 Set the bias Az b5 to 58 8 8 Set the cycle Ax de period to 2 amp seconds Initialise the control system and monitor the control results If the original settings causes process oscillations then gradually decrease the proportional gain until the oscillations decrease to an acceptable steady cycle If the original settings do not cause process oscillations then gradually increase the proportional gain until a steady process cycling is observed Once the steady cycling state is achieved note the difference between the display value and the control setpoint value Gradually increase or decrease the bias value until the displayed value matches or cycles about the control setpoint value Gradually increase the integral gain until the process begins to oscillate Then reduce the integral gain slightly to regain the control without this added oscillation Create a step change to the process conditions and observe the control results It may be necessary to fine tune the settings and use integral limits to obtain optimum results PM4PHMAN 2 0 1 49 of 54 Set up sequence Symptom Solution Proportional gain Slow response Increase proportional gain Proportional gain High overshoot or oscillation Decrease proportional gain Proportional bias Process above or below setpoint Increase or decrease bias as required Integral gain Slow response Increase integral gain Integral gain Instability or oscillatio
9. Optional 2683 2400 4605 S9605 9 2 or 38 4 Pet Parity for serial communications AGRE EUEN AGRE 5 48 34 Optional or odd G Puot Output for serial di SP Cant Cant 5 49 34 communications Optional GLE or RAibuS Addr Instrument address for serial Gtozi 5 5 50 35 communications Optional Optional this function will only be accessible if the relevant option is fitted 12 of 54 PM4PHMAN 2 0 1 4 1 Relay table Record your relay settings in the table below Display Relay 1 Relay 2 Relay 3 Relay 4 Relay 5 Relay 6 Relay 7 Arlo Ar H ArH Arte Arre Arna a or Rane RAcSP or Ark fetc n a A Ae etc Air OPE n a n a n a n a n a Ax 5P n a n a n a n a n a ctr SPAN n a n a n a n a n a Ax PS n a n a n a n a n a Art 9 n a n a n a n a n a ArI L n a n a n a n a n a Az H n a n a n a n a n a Air bS n a n a n a n a n a Ar de n a n a n a n a n a Ar dr n a n a n a n a n a PM4PHMAN 2 0 1 13 of 54 5 Explanation of functions The PM4 setup and calibration functions are configured through a push button sequence The three push buttons located at the rear of the instrument also at the front on some display options are used to alter settings Two basic access modes are available FURE mode simple push button sequence allows access to commonly set up functions such as alarm setpoints CAL mode po
10. Range Any display value Default Value BDD Seen only when analog retransmission option fitted Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted for wiring details and link settings Displays and sets the analog retransmission 4 20mA 0 1V or 0 10V link selectable output high display value 20mA 1V or 10V in displayed engineering units To set the analog output high value go to the FEET function and use the B or amp push buttons to set the required value then press GJ to accept this selection Example If it is required to retransmit 20mA when the display indicates 5 then select 5 in this function using the amp or amp button 24 of 54 PM4PHMAN 2 0 1 5 23 Second analog output option low value Display Feo Che Range Any display value Default Value amp See FEE function 5 21 for description of operation 5 24 Second analog output option high value Display Feo Che Range Any display value Default Value BOD See FEET function 5 22 for description of operation 5 25 Calibration offset Display DFSk CAL Range Any display value Default Value n a Calibration offset See section 8 1 5 26 First calibration scaling point Display CAL i Range Any display value Default Value amp First scaling point for 2 point calibration scaling See Calibration chapter section 8 2 5 27 Second calibration scaling point Display CALZ Ran
11. SPRA Range Any display value Default Value DU The function of the control span is to define the limit to which the PI control values will relate The control span value will be common to all control relays i e if more than one control relay output is being used then each of these relays operates from the same control span setting The span value defines the range over which the input must change to cause a 100 change in the control output when the proportional gain is set to 4005 This function affects the overall gain of the controller and is normally set to the process value limits that the controller requires for normal operation For example if the control setpoint Ax SP is T O and the ckr SPAM is 2 0 and Ax P9 is set to LDD then an error of 2 8 from the setpoint will cause a 100 change in proportional control output For example with Ar SP at 1 4 ctr SPAM at Z D Ac P9 at L000 and ArbS at G 833 a display reading of 5 8 or lower Ax SP minus ckr SPAM the control output will be at 100 i e the relay will be on continuously The control output will then gradually adjust the on off time as the display value reaches the setpoint 44 of 54 PM4PHMAN 2 0 1 9 4 PI relay proportional gain Display Ax PS Range 32 15 7 to 32 767 Default Value D D iG Note the range value may be restricted if the number of display digits does not allow viewing of the full range The proportional value will determine the degree to which the control
12. above relay permanently off ad ca co cI c3 j cJ c3 Reading of 7 amp or below relay permanently on Reading of 7 amp to 9 relay pulses with off time increasing as value approaches 9 amp Reading 9 8 or above relay permanently off ad 3 C3 3 C3 wn C3 C3 Reading of 5 5 or below relay permanently on Reading of 6 4 to 4 0 relay pulses with off time increasing as value approaches 7 5 Reading 7 relay pulses at 50 on and 50 off Reading 7 8 to B D relay pulses with off time increasing as value approaches 8 50 Reading 8 8 or above relay permanently off ad C3 C3 wn 3 C3 wn C3 C3 Reading 5 8 or below relay permanently on Reading 5 8 to 7 relay pulses with off time increasing as value approaches 7 Reading 7 5 relay pulses at 50 on and 50 off Reading 7 8 to 9 G relay pulses with off time increasing as value approaches 9 Reading amp or above relay permanently off ad C3 3 C3 C3 wn C3 C3 Reading of 5 5 or below relay permanently off Reading of 6 4 to 7 relay pulses with on time increasing as value approaches 7 0 Reading 7 relay pulses 50 on and 50 off Reading 7 8 to B D relay pulses with on time increasing as value approaches 8 50 Reading 8 8 or above relay permanently on 9 5 PI relay integral gain Display Act 93 Range 32 15 7 to 32 767 Default Value 5 50
13. for another operation or by removing power from the instrument Note In this mode the bargraph will show a zero reading until the remote input is operated for the first time after switch on e H peak max memory mode With the peak remote input switch open the bargraph will indicate the peak value in memory i e the bargraph can rise but not fall The bargraph can be reset by clearing the memory The memory may be cleared either by closing the PM4PHMAN 2 0 1 33 of 54 remote input switch for approximately 2 seconds or by temporarily removing power to the instrument e La valley min memory mode With the valley remote input switch open the bargraph will indicate the valley min value in memory i e the bargraph can fall but not rise The bargraph can be reset by clearing the memory The memory may be cleared either by closing the remote input switch for approximately 2 seconds or by temporarily removing power to the instrument e d SP display mode The bargraph display will follow whatever value is on the 7 segment display For example if the remote input is to EAFE then the 7 segment and bargraph will indicate the tared value and both will also be changed if the remote input toggles the displays between MEE amp E and SF QS If the BAF function had been set to KAFE then the bargraph would not respond to the 9r 5S toggle 5 47 Baud rate for optional serial communications Display bAUd FREE Range 300 600 203 2463 48oo 9500
14. gain Slow response Increase integral gain Integral gain Instability or oscillations Decrease integral gain 52 of 54 PM4PHMAN 2 0 1 10 Specifications 10 1 Technical specifications Input Temperature input Impedance Measuring range ADC Resolution Accuracy Sample Rate Display update Microprocessor Ambient temperature Humidity Display Power Supply Power Consumption Output standard Relay Action pH any electrode where Eo 7 Redox any standard Redox ORP electrode 2V to 2V nominal 100Q RTD 10009 RTD LM335 3kQ Balco thermistor or manually set Greater than 10 Q 0 00 to 14 00pH 2000mV for Redox and 40 to 130 C for temperature 1 in 20 000 0 2 of full scale pH and Redox 1 sample per second 4 times per second HC68HC11F CMOS LED 10 to 60 C LCD 10 to 50 C 5 to 95 non condensing LED Models 4 digit 20mm 5 digit 14 2mm status LEDs 4 way keypad 6 digit 14 2mm 4 way keypad LED Bar Graph 20 segment bar 5 digit 7 6mm relay status LEDs LCD Models 4 digit 12 7mm 6 digit 12 7mm AC 240V 110V or 24V 50 60Hz or DC isolated wide range 12 to 48V Special supply types 32VAC 48VAC 50 60Hz or DC isolated 50 to 110V also available Note supply type is factory configured AC supply 4 VA max DC supply typically 100mA at 12VDC and 50mA at 24VDC for PM4 with no optional outputs actual current drawn depends on display type and options fitted 1 x relay Form A
15. i e at CALZ press the and amp pushbuttons simultaneously etc except that SEL 2 will be seen instead of SEL 4 It is essential that the second buffer is different in value to the one used for the CAL input Example First point Place electrode in buffer 1 e g 4 00 ph At the CAL function press the and amp pushbut tons simultaneously A live reading will be seen Allow the reading to stabilise then press the pushbutton The display will show SEt fol lowed by a value Use the amp or amp pushbutton to make this value equal the first buffer value e g GG for a 4 00 pH buffer Buffer solution 1 Example Second point PM4PHMAN 2 0 1 39 of 54 Wash and dab dry the electrode then place the electrode in the second buffer e g 7 00 pH At the CALZ function press the ZB and M pushbuttons simultaneously A live reading will be seen Allow the reading to stabilise then press the pushbutton The display will show SCL2 followed by a value Use the or M pushbutton to make this value equal the first buffer value e g 4 50 for a 7 00 pH buffer Buffer solution 2 8 3 Grab calibration 9 Ab CAL and 9 Ab SELE grab sample calibration can be used for pH or Redox ORP inputs The grab sample calibration method can be used to provide a single point offset calibration This method allows a sample to be taken and the input at that time stored in memory The sample can then be analysed and the value for this s
16. modes which follow is required e OE temperature mode When set to temperature mode the retransmission will follow the temperature reading e P Hid peak hold mode The 7 segment display and retransmission value will indicate the peak value only whilst the peak value function is operated via a contact closure on the remote input i e the 7 segment display and retransmission can rise but not fall whilst the remote input switch is closed When the remote input switch is opened the retransmission value will remain fixed i e it will not rise or fall although the 7 segment display value will be free to alter This peak retransmission output can be cleared by closing the remote input switch for another operation or by removing power from the instrument Note In this mode the retransmission will show a zero reading until the remote input is operated for the first time after switch on e d Hid display hold mode The 7 segment display and retransmission value will be held whilst the remote input display hold switch is closed When the switch is opened the retrans mission value will remain fixed at the held value although the 7 segment display value will be free to alter The held retransmission output can be cleared by closing the remote input switch for another operation or by removing power from the instrument e H peak max memory mode With the peak remote input switch open the retransmission will indicate the peak value in memory i e the
17. retransmission output can rise but not fall The retransmission output can be reset by clearing the memory The memory may be cleared either by closing the remote input switch for approximately 2 seconds or by removing power to the instrument 32 of 54 PM4PHMAN 2 0 1 e La valley min memory mode With the valley remote input switch open the retransmis sion will indicate the valley min value in memory i e the retransmission output can fall but not rise The retransmission output can be reset by clearing the memory The memory may be cleared either by closing the remote input switch for approximately 2 seconds or by removing power to the instrument e d SP display mode The retransmission output will follow whatever value is on the 7 segment display Note in display mode any decimal points on the display will be ignored e g a reading of 1 4 will be taken as having a value of 14 this must be compensated for when setting the FEE and FEET functions 5 46 Bargraph display operation mode Display bAr Range Lo uE OC P HLd d HLd Hi La or di SP Default Value L gt uE The following choices are available for bargraph display mode e L wE live input mode The bargrpah display will always follow the electrical input at that time irrespective of the 7 segment display value For example if the remote input is set for peak hold operation then when the remote input is closed the 7 segment display will only show the peak value but the bar
18. sensor or Jte 3KQ Balco temperature sensor used by certain pH electrode manufacturers e g TBI Uniloc and Bradley James Corporation 5 34 Default solution temperature Display dEF OF Range 5 8 to 263 3 Default Value 25 3 Displays and sets the display default solution temperature when no temperature sensor is used The default solution temperature chosen is used to calculate the pH temperature compensation and so this value should be set as close as possible to the solution temperature Default temperature can be set from 0 0 to 200 0 C When a temperature sensor input is selected at the PE amp YPE function and connected the default solution temperature is ignored and the live temperature reading used PM4PHMAN 2 0 1 27 of 54 5 35 Calibrate temperature sensor Display CAL E Range n a Default Value n a Temperature sensor calibration function Refer to section 8 6 5 36 Uncalibrate temperature sensor Display UCAL OC Range n a Default Value n a Temperature sensor uncalibration function Refer to section 8 7 5 37 Analog output PI control Display rEc ctr Range on or GFF Default Value GFF Analog output mode seen only when analog output option is fitted This function allows selection of an or GFF for PI control analog output If set to GFF the analog output operates as a retransmission output and uses the functions described in this chapter If set to an the analog output operates as a PI control output
19. step 1 when accessing function unless power has been removed 14 of 54 releasing the 8 button press then release the 2 and amp buttons together The display will now indicate FURL followed by the first function PM4PHMAN 2 0 1 Example Entering FUNE mode to change alarm 1 high function A iH from GFF to aa Press amp release B Press amp release Press amp release gt m NT gt gt ha 1 gt i m pa m gt then press BR Lb th B until IH LJ B until mn Press amp release Press amp release min 100 a asin Func gt End Example Entering CAL mode to change decimal point function df Pt from amp to B D Switch off Press amp hold Switch on rm een fe instrument gt Held unti j gt E AL gt Release Press amp release J rir Press amp release rT Press amp release gt gt gt Wt Bint OLPre BS unti i Press amp release Press amp release i nn a gt gt gt For gt End B O or B until F Lh m Easy alarm relay adjustment access facility The display has an easy alarm access facility which allows access to the alarm setpoints simply by pressing the I button at the front or rear of the instrument The first setpoint will then appear and changes to this setpoint may be made to this setpoint via the Z or M buttons Press the 8 button to accept any changes or to move on to the next setpoint Note this easy access also functions in the same manner for the PI control setpo
20. to the alarm relay setpoints The following choices are available A i Allows setpoint access to alarm 1 only A i Allows setpoint access to alarms 1 and 2 only Fii 32 Allows setpoint access to alarms 1 2 and 3 etc up to the maximum number of relays fitted The remote input function fF RP must be set to SP AC for this function to operate Note 30 of 54 PM4PHMAN 2 0 1 Only the setpoints which have been given a value will be accessible e g if A fH is set to GFF then there will be no access to the A iH function when SPAT is used 5 43 Grab calibration on or off Display Sr Ab CAL Range on or GFF Default Value GFF Used to allow or not allow grab calibration procedure See Calibration chapter section 8 3 5 44 Alarm relay operation mode for each relay e g A 1 RZ etc Display Ax Range Lo uE OC P H d d Hid H Laor do SP Default Value L wE Alarm relay operation mode for relays Note relays 1 and 2 can only be used in these modes if the Ax GPEF function for the relay required is set to Ax AL The following choices are available for alarm operation mode e L wE live input mode for channel 1 The alarm relay operation will always follow the channel 1 electrical input at the time irrespective of the 7 segment display value e g assume the remote input is set to PHid and A iLa is set to 10 The display may be indicating a peak reading of 12 but if the electrical input changes to correspond with a n
21. when the relay is de activated Frequency control operates by changing the rate at which the relay switches on and off In a typical control application the frequency control operation is particularly suited for use when one shot dosing is used i e the pump or other device puts out a fixed dosing quantity for every pulse received 9 1 Relay pulse width modulation control mode To use pulse width modulation control Axz eP must be selected at the Ax GPEr function Pulse width control on Rela Proportional gain y at a given value off time on Proportional gain increased Relay leading to greater on time for a given error One control cycle S set by Axde off time PM4PHMAN 2 0 1 43 of 54 9 2 PI relay control setpoint Display Fir SP Range Any display value Default Value amp The control setpoint is set to the value in displayed engineering units required for the control process The controller will attempt to vary the control output to keep the process variable at the setpoint Note that the control setpoint value can be reached and adjusted via the easy access mode see Explanation of functions chapter if the RAEES function is set to EAS This feature could be useful if the setpoint is to be frequently changed PROCESS A Process above setpoint Process at setpoint SETPOI NT poe era Process below setpoint TIME 9 3 PI relay control span Display ctr
22. 00 Note the range value may be restricted if the number of display digits does not allow viewing of 46 of 54 PM4PHMAN 2 0 1 the full range The Integral action will attempt to correct for any offset which the proportional control action is unable to correct e g errors caused by changes in the process load When the integral gain is correctly adjusted the control output is varied to maintain control by keeping the process variable at the same value as the control setpoint Since the integral gain is time based the output will gradually increase if the error does not decrease i e if the measured value remains constant and there is an error a difference between the measured value and the setpoint then the frequency will be increased compared to the previous frequency output The higher the proportional gain the greater the degree by which the on to off ratio will be affected i e the response will be greater at higher integral gain settings With an integral gain of LODO an error of 8 or more with control span set at 4 5 will cause the integral action to try to correct at the rate of 100 minute With an integral gain of G 288 an error of 8 or more will cause the integral action to try to correct at the rate of 20 per minute Too high an integral gain will result in instability To low an integral gain will slow down the time taken to reach the setpoint The optimum setting will depend on the lag time of the process and the other control set
23. 19 2 or 38 4 Default Value S600 Set baud rate seen only with serial output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when optional outputs are fitted Select from 300 DD 200 2400 800 95600 19 2 or 38 4 baud 5 48 Parity for optional serial communications Display Prey Range MONE EVEN or add Default Value MODNE Set parity seen only with serial output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when optional outputs are fitted Select parity check to either NONE EUEN or add 5 49 Output mode for optional serial communications Display G Put Range d SP Cont POLL or A buS Default Value Cant Set serial interface mode seen only with serial output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when optional outputs are fitted Allows user to select the serial interface operation as follows d SP sends image data from the display without conversion to ASCII Cont sends ASCII form of display data at a rate typically 90 of the sample rate 34 of 54 PM4PHMAN 2 0 1 GLL controlled by computer or PLC as host Host sends command via RS232 485 and instru ment responds as requested Fi bu5S is a special communications mode used with Windows compatible optional PC download software Refer to the user manual supplied with this optional software 5 50 Instrument addre
24. 7pH then this is a good indication that the display is working correctly in displaying pH value If a pH simulator is available then check the display reading either side of 7 pH to cover the normal measuring range of the installation If the readings in 2 and 3 above are not correct then contact the supplier of the display If the readings in 2 and 3 above indicate that the display is measuring pH correctly then reconnect the pH electrode and temperature sensor if used and follow the steps below Ifa temperature sensor is used check the temperature reading and recalibrate the temperature display if necessary It is essential that the temperature reading is correct before checking the pH output from the electrode 36 of 54 PM4PHMAN 2 0 1 6 Clean the electrode in water preferably distilled and dab dry the electrode and place it in a beaker containing a solution of known pH value e g 4 00 pH buffer and note the reading then clean and dab dry the electrode and place it in a beaker with a second solution of known pH value e g 7 00 pH and note the reading Ideally the two solutions used should cover the normal measurement range of the application e g if the normal expected reading is around 8pH then use 7 00 and 10 00 pH buffers solutions 7 If the readings in 6 above are more than 1 pH different from the buffer values then it can be assumed that the electrode needs to be replaced If the readings in 6 above are close to th
25. Insert the links into the appropriate location on the pin header to suit the range required LM335 5 RTDS 100R LM335 RTDS 100R aa LM335 sensor selected LM335 RTDS 100R 1000Q RTD PT1000 aia or 3kQ thermocouple sensor selected LM335 RTDS 100R aU 1009 RTD PT100 sensor selected 8 of 54 PM4PHMAN 2 0 1 4 Function tables summary of setup functions Note the order in which the functions appear on the display may not be exactly as shown below The availability and order of functions is determined by choice of function settings and options fitted Functions in this first table are available in FUFIZ or TAL mode Display Function Range Default Your Ref Page record Arloa Low setpoint value for Any display GFF See ba 16 designated alarm relay x value or GFF 4 1 Ar Hi High setpoint value for Any display GFF See oA 17 designated alarm relay x value or GFF 4 1 AcHY Hysteresis value for the O to 9999 iG See 5 5 18 designated alarm relay zx 4 1 Artt Trip time delay for the D to 9999 Ht See 5 6 18 designated alarm relay zx 4 1 Arre Reset time delay for the D to 9999 G See 5 7 19 designated alarm relay zx 4 1 Ara ao Alarm relay x action to normally Fizn a or FAirn a See 5 8 19 or open de energised or normally Rrn ec 4 1 Rrn e closed energised Fir SP PI relay control setpoint Any display 5 See 9 2 44 value 4 1 Opti
26. Model PM4 PH and PM4 OR pH or Redox ORP Panel Mount Display Controller Operation and Instruction Manual AMALGAMATED INSTRUMENT CO PTY LTD ACN 001 589 439 Unit 5 28 Leighton Place Hornsby Telephone 61 2 9476 2244 e mail sales aicpl com au NSW 2077 Australia Facsimile 61 2 9476 2902 Internet www aicpl com au Table of Contents 1 Introduction 2 Mechanical Installation 3 Electrical installation 4 Function tables summary of setup functions 5 Explanation of functions 6 Error messages 7 Fault finding 8 Calibration 9 Setting up the relay PI controller 10 Specifications 11 Guarantee and service 2 of 54 14 35 36 38 43 53 54 PM4PHMAN 2 0 1 1 Introduction 1 1 General description This manual contains information for the installation and operation of the PM4 PH Monitor This instrument is a general purpose pH Redox monitor which may be configured to accept an input from a standard pH electrode Eo 7 an electronic unity gain buffer amplifier or a standard Redox ORP electrode The instrument is user configurable for use as a pH or Redox monitor A second input is provided for a temperature sensor for automatic pH temperature compensation The PM4 can accept various types of temperature sensors 100Q RTD 10009 RTD 3kQ thermistor or LM335 or a default temperature can be manually set Calibration setpoint and other set up functions are easily achieved by push buttons located at the rear panel and o
27. ample entered at a later time The grab sample offset calibration method operates as follows 1 Set the Sr Ab CAL an GFF function to an note this is the second 9r Ab CAL function which appears in the table Press the J button to accept the change then press the button to exit to normal measurement mode 2 When ready to perform a grab sample calibration ensure that the electrode is in the solution to be measured Enter the functions via EAL mode and at the first 9 Ab CAL function press the and Bd buttons simultaneously 3 A live pH or ORP reading will now be displayed When the reading has settled to a steady value press the I button The pH or ORP value for that sample will now be stored in memory The message 9r Ab End and FUNE End will be seen and the display will go back to its normal live reading 4 When the sample has been analysed or checked with a reference meter if any adjustment to the display reading is needed the true value for the sample can be entered at the 9r Ab SELE function Enter the functions via CAL mode and pass by the 9 Ab CAL function to the 9r Ab SELE function 5 At the 9 Ab SELE function press the A and amp buttons simultaneously The previous scale value in memory will be seen Adjust this value to the required value for the sample using the amp or amp button 6 When the required value is displayed press the button to accept the new value the message GFSt End will be displayed and the calibratio
28. are short circuited or entry is made via EAL mode or if the RECS function is set to ALL e duit display brightness control The remote input can be used to change the display brightness When this mode is selected the display brightness can be switched via the remote input terminals between the brightness level set at the br 9t function and the brightness level set at the dutt function 5 39 Q button function Display Pout Range AGKHE WH Laor to Default Value MODNE 2 button function The GQ button may be set to operate some of functions also available via the remote input If both the remote input and GQ button function are operated simultaneously the button will override the remote input Functions available are e NONE no function required i e pressing the GJ button has no effect e H peak memory The peak value stored in memory will be displayed if the button is pressed momentarily the display will return to normal measurement after 20 seconds If the 2 button is held pressed for 3 seconds or the power is removed from the instrument then the memory will be reset PM4PHMAN 2 0 1 29 of 54 e La valley memory The minimum value stored in memory will be displayed Otherwise operates in the same manner as the H function described above e H La toggle between H and Le displays This function allows the GJ button to be used to toggle between peak and valley memory displays The first operation of the button will
29. ay mode is used then the alarms will operate purely on the display value at the time i e if the display is showing above high setpoint or below the low setpoint value then the alarm relay will activate For example if the remote input were set to peak memory and A1 were set to display mode then unless the display is actually showing the peak memory value i e the remote input has just been activated the alarm relay is free to operate from the changing display value i e the memory does not have to be reset to clear an alarm condition Note in display mode any decimal points on the display will be ignored e g a reading of 4 7 will be taken as having a value of 47 this should be borne in mid when setting the Ax Lo and Ax H functions 5 45 Analog retransmission output mode Display FEE Range Lo uE OC P HLd d Hid H Laor di SP Default Value b gt uE The following choices are available for analog retransmission operation mode note the FEE ckr function must be set to GFF to use these modes e L u live input mode for channel 1 The retransmission will follow the electrical input on channel 1 and will not necessarily follow the 7 segment display For example if the remote input is set for peak hold operation then when the remote input is closed the 7 segment display will only show the peak value but the retransmission will be free to change to follow the electrical input This will be the normal setting used unless one of the special
30. cate a faulty temperature sensor or that the temperature sensor is not fitted Display shows iG REE this indicates that the ACES function has been set to AGRE or the rt RP function has been set to na Ae blocking entry to FURE mode Enter functions via CAL mode to gain entry to functions and if required change the RECS or F 4 AP function setting Display shows MO SPARE this indicates that the 7 3 RP function has been set to SP Ale blocking entry to alarm relay functions Enter functions via CAL mode to gain entry to functions and if required change the F FP function setting Fault finding General information For accurate repeatable readings the pH and Redox electrodes must be clean and must be in contact with the process solution at all times Both pH and ORP electrodes have a finite life and the output from these electrodes will drop over time When the output becomes too weak calibration will not be possible and a new electrode should be fitted Most electrodes contain external and internal glass parts and should be handled carefully Any breakage or cracking of the glass internally or externally will lead to failure of the electrode Checking the pH display and electrode Uncalibrate the display using the UCAL GM function Disconnect the pH electrode and temperature sensor Connect a short circuit or pH simulator set for 7pH across the pH input terminals the display value should be very close to 7pH If it is close to
31. ction will not be seen until a value has been set for the low or high alarm e g for A ita or A tH The best results are usually achieved by initially configuring as a Proportional Only controller and then introducing the Integral functions when stable results are obtained Relay 1 and if fitted relay 2 can be set to operate in PI control mode Any other relays fitted will only operate in normal non PI operation The x in the Aa GPEr and other functions indicates the chosen relay i e for relay 1 the display will show A i GPEF R LSP etc The Ar GPE function allows three choices of operating mode for the chosen relay namely Ax AL Av tP and Ax Fre If RAx AL is selected the chosen relay will operate as a setpoint relay whose operation is controlled by the Ax H Arto etc settings and the PI control settings will not be seen See the Explanation of functions chapter for details of operation when Arx At is selected If Axv amp P is selected then the chosen relay will operate in pulse width control mode If Ax Fr is selected then the chosen relay will operate in the frequency control mode Pulse width control operates by controlling the on to off time ratio of the relay In a typical application this would be used to control the length of time for which a dosing pump is switched on during a control cycle i e the pump or other device will continuously operate for the length of time the relay is activated and will stop operating
32. display value will be held whilst the remote input terminals are short circuited The message d H d will appear briefly every 8 seconds whilst the input terminals are short circuited to indicate that the display hold function is active e H rate peak memory The rate peak value stored in memory will be displayed if the remote input terminals are short circuited if the short circuit is momentary then the display will return to normal measurement after 20 seconds If the short circuit is held for 2 to 3 seconds or the power is removed from the instrument then the memory will be reset e ia rate valley memory The rate minimum value stored in memory will be displayed Otherwise operates in the same manner as the H function described above e H La rate toggle between H and La displays This function allows the remote input to be used to toggle between rate peak and valley memory displays The first operation of the remote input will cause the peak memory value to be displayed the next operation will give a valley memory display PH or Pta will flash before each display to give an indication of display type e SP Re setpoint access only This mode blocks access to any functions except the alarm setpoint functions unless the remote input pins are short circuited or entry is made via TRL mode or if the REES function is set to either ERSY or ALL e fia Fle no access This mode blocks access to all functions unless the remote input pins
33. e buffer values the it can be assumed that both the electrode and display are operating satisfactorily continue on to the steps below 8 If necessary perform a 2 point calibration to ensure that the display is matched to the electrode at the values of the two buffer solutions used 9 Take a sample of the process solution and place it in a beaker make a note of the pH reading after allowing time for the pH electrode to respond to any temperature change 10 Place the electrode into its normal process pipe or vessel location and compare the reading to that taken in 9 above again allow time for the pH electrode to respond to any temperature change If the readings are close then it can be assumed that the pH measuring system is operating correctly If there are large differences or instable readings then problem can be assumed to be caused by the conditions at the normal pH electrode location Common problems at the location are e Air locks or air bubbles the electrode must be in contact with the process solution at all times for correct operation e Electrical current flowing in the process solution typically caused by leakage from electric motors pumps level sensors etc e Coating of electrode by dyes paints oil fats solids etc in the process solution e Faulty extensions or junctions made to the electrode cable Checking the Redox display and electrode The output from the Redox electrode can be measured directly using a v
34. e calibration point is used usually EAL Z for routine calibrations and two points being used periodically for full calibration The procedure for entering the first scaling point is 1 If a temperature sensor is used check that the temperature reading is correct If it is not correct perform a temperature calibration using function 5 35 before proceeding If a tem perature sensor is not used then check that the default temperature setting function 5 34 is set correctly before proceeding 2 Place a cleaned and dabbed dry probe into the first buffer solution e g 4 00 pH use distilled water for cleaning the probe 3 At the CAL function press ZB and M simultaneously then release them The display will indicate the live input value Do not be concerned at this stage if the live input display value is not the pH value required Allow time for the reading to stabilise It is important that the live input value seen is a steady value If the reading does not stabilise then the input needs to be investigated before proceeding with the scaling 4 Press then release the I button The display will indicate SEL 1 followed by a value Use the or button to change this value to the buffer value at this input e g 4 00 for a 4 00 pH buffer Press the I button to accept changes or the button to abort the scaling CALZ Second scaling point for 2 point scaling method The second point scaling is performed in exactly the same manner as EAL
35. e off time to maintain the setpoint but not reduce it If a 100 error is seen then the pulse rate will be at its maximum i e the off time will equal Ax de If a 50 error is seen there will be a pulse every 2 times Ax de For a 25 error there will be a pulse every 4 times Axz de and for a 10 error there will be a pulse every 10 times Az de 50 of 54 PM4PHMAN 2 0 1 This table shows the effect of the output frequency of changing proportional gain and bias with the following settings ctr SPAN 2 G R tide L0 A n 9 6 068 165 Effect on relay operation aJ ID wr vu my vu fa R D C3 C3 3 3 5 Reading of 5 8 or below relay pulses at maximum frequency Reading of 5 G to 4 0 relay pulses with frequency decreasing as value approaches 7 5 Reading 7 amp or above relay permanently off ad ca ca cI c3 j c3 t Reading of 4 5 or below relay pulses at maximum frequency Reading of 7 0 to 9 G relay pulses with frequency decreasing as value approaches 9 amp Reading amp or above relay permanently off ad 3 C3 3 C3 wn C3 C3 Reading of 5 5 or below relay pulses at maximum frequency Reading of 6 2 to B D relay pulses with frequency decreasing as value approaches 8 period increased by 50 at 7 amp compared to minimum period e g if minimum period is 4 seconds the period at 7 will be 6 seconds Reading 8 amp or above relay permanently off
36. e placed either way around at the temperature input Note If using low noise pH Redox coaxial cable with an anti microphonic layer ensure that this layer is removed from the exposed wiring This layer is conductive and may cause a short circuit between the centre conductor and the cable shield resulting in an incorrect indication usually this fault would be seen as a constant 7 00 pH or OmV indication Central Conductor y Insulation ir t h Anti Microphonic Layer Shield Outer Insulation 6 of 54 PM4PHMAN 2 0 1 3 3 Input Output Configuration If you need to alter the input or output configuration link settings proceed as follows 1 Remove the plug in terminals from the rear of the instrument 2 Remove the 4 x self tapping screws from the back cover then remove the back cover by pulling it away from the instrument P P A 3 Remove the earth screw which passes through the underside of the case then slide out the board or boards Remove earth screw which passes through the case then slide out the printed circuit board 4 Configure the PCB links as requred see appropriate chapter 5 Slide PCB back into case 6 Replace the earth screw which passes through the case 7 Refit the back cover and fix with the self tapping screws 8 Plug the terminal strips back into the rear of the instrument PM4PHMAN 2 0 1 7 of 54 3 4 Temperature sensor type link selection Dismantle the instrument as described in section 3 3
37. ed The advantage of using separate low and high limits is that in many applications the response is very one directional e g the system may respond very quickly to a heat input but may cool down at a much slower rate Separate high and low limit settings allow independent limiting of the integral control swing below and above the setpoint so a smaller minimum limit can be set to limit swings below the setpoint to compensate for the slower cooling time The minimum and maximum limits are used in conjunction with the output bias setting to maintain the control process setpoint value For example with a bias Ax bS set at 50 minimum limit set at 20 and a maximum limit of 30 the actual bias when the process is at the setpoint may be anywhere between 30 and 80 i e Integral control is being used to alter the bias setting in order to maintain the process at the setpoint In this case the minimum term will allow the bias to drop to a value between 50 and 30 in order to maintain the setpoint The maximum term will allow the bias point to rise to a value between 50 and 80 in order to maintain the setpoint 9 7 PI relay integral control high limit Display Act H Range D D to 33 3 Default Value 38 3 The maximum limit can be used to reduce overshoot of the control setpoint when the control output is increasing i e rising above the setpoint Other than this the limit operates in the same manner as the low limit described previously 9 8 PI re
38. en opened tampered with or if repairs have been made or attempted by anyone except an authorised representative of the manufacturing company Products for attention under guarantee unless otherwise agreed must be returned to the manu facturer freight paid and if accepted for free repair will be returned to the customers address in Australia free of charge When returning the product for service or repair a full description of the fault and the mode of operation used when the product failed must be given In any event the manufacturer has no other obligation or liability beyond replacement or repair of this product Modifications may be made to any existing or future models of the unit as it may deem necessary without incurring any obligation to incorporate such modifications in units previously sold or to which this guarantee may relate This document is the property of the instrument manufacturer and may not be reproduced in whole or part without the written consent of the manufacturer This product is designed and manufactured in Australia 54 of 54 PM4PHMAN 2 0 1
39. ept this value 5 14 Bargraph high value Display bArr Range Any display value Default Value BOD Seen only in bargraph display instruments Displays and sets the bar graph high value i e the value on the 7 segment display at which the bargraph will reach its maximum indication e g all LEDs illuminated May be independently set anywhere within the display range of the instrument To set bargraph high level go to the bA 7 function and use the amp or amp push buttons to set the value required then press GJ to accept this value PM4PHMAN 2 0 1 21 of 54 5 15 Bargraph type Display br EYPE Range bAr S dot d dot C bAF or r dat Default Value bAr Bar graph display operation mode seen only in vertical or circular bargraph display instruments Allows selection of bargraph operation mode Choices available are e bfer conventional solid bargraph display i e all LEDs illuminated when at full scale When scaling the display use the bAr and BAr functions e g bArr Gand bAr DBO will give a bargraph with no segments lit at a 7 segment display reading of B and all segments lit with a 7 segment display reading of 100 e 5 dat single dot display A single segment will be lit to indicate the input readings position on the scale When scaling the display use the bArr and bAr functions e g bAr Gand bAr 168 will give a bargraph with the bottom segment lit at a 7 segment display reading of G and the top se
40. et by the br S function 5 11 and the display brightness set by the desb L function The display dull level is selectable from G to 5 where amp lowest intensity and 5 highest intensity This function is useful in reducing glare when the display needs to be viewed in both light and dark ambient light levels To set dull level go to the dut L function and use the amp or amp push buttons to set the value required then press GJ to accept this value Example With duit set to 4 and br 9t set to 5 and the F t RP function set to det l the display brightness will change from the 5 level to when a switch connected to the remote input terminals is activated 5 13 Bargraph low value Display bAr Range Any display value Default Value amp Seen only in bargraph display instruments Displays and sets the bar graph low value i e the value on the 7 segment display at which the bargraph will start to rise This may be independently set anywhere within the display range of the instrument Note The bAr and bAr settings are referenced from the 7 segment display readings not the bargraph scale values The bargraph scale may scaled differently to the 7 segment display For example the bargraph scale may be indicating percentage fill of a tank whilst the 7 segment display is indicating actual process units To set bargraph low level go to the bA function and use the amp or push buttons to set the value required then press GJ to acc
41. g the ATES function to EAL see section 5 41 8 1 Offset calibration The offset calibration offers a single point adjustment across the whole calibration slope The offset procedure can be used to adjust the reading when the same error exists at all readings e g reading 0 5 pH high To enter the offset function press the and S pushbuttons simultaneously at the GFSt CAL function the display will indicate the live pH reading for the solution Place the probe in a known buffer solution or in the process solution if the pH of this solution is accurately known When the display has stabilised press the GJ button the display will now read GFSt SELE followed by the value in memory the offset may now be changed using the amp or M pushbuttons to read the correct value of the buffer or process solution To enter the corrected value into memory press the f button The display will show GF St End and the system offset will be adjusted so that the display will match the corrected value ELECTRODE MILLIVOLTS ELECTRODE OFFSET mV 0 pH 7 pH 14 pH 8 2 Live signal input calibration CAL first scaling point CAL and CALZ functions are used together to scale the instruments display Two calibration 38 of 54 PM4PHMAN 2 0 1 buffer solutions will be required e g 4 00 and 7 00 pH buffers The CAL function sets the first calibration point Note CAL and CAL Z can be set independently and in some applications only on
42. ge Any display value Default Value 883 Second scaling point for 2 point calibration scaling See Calibration chapter section 8 2 PM4PHMAN 2 0 1 25 of 54 5 28 Display rounding Display drnd Range to SEDD Default Value Displays and sets the display rounding value This value may be set to 1 5000 displayed units Display rounding is useful for reducing the instrument resolution without loss of accuracy in appli cations where it is undesirable to display to a fine tolerance To set the display rounding value go to the dend function and use the amp or M push buttons to set the required value then press to accept this selection Example If set to the display values will change in multiples of 10 only i e display moves from to D to 38 etc 5 29 Decimal point Display dOPE Range G D fete Default Value amp Displays and sets the decimal point By pressing the or pushbutton at the d Pt function the decimal point position may be set The display will indicate as follows no decimal point G 1 decimal place 2 82 2 decimal places 8 883 3 decimal places and G 8G8 for display with more than 4 digits Note if the decimal point is altered the display will need to be recalibrated and alarm etc settings checked 5 30 Digital filter Display Fler Range U to B Default Value 2 Displays and sets the digital filter value Digital filtering uses a weighted average method of de
43. gment lit with a 7 segment display reading of IBD Note this could also be set up as a centre zero single dot display by entering a negative value and positive value e g BAr DD bAr 7 DD e d dat double dot display Two segments will be lit to indicate the input reading position on the scale The reading should be taken from the middle of the two segments When scaling the display use the bAr and BAr functions e g BAe Gand bArr 186 will give a bargraph with the bottom two segments lit at a 7 segment display reading of G and the top two segments lit with a 7 segment display reading of IBO Note this could also be set up as a centre zero double dot display by entering a negative value and positive value eg bBAr IDU bArr 130 e 6Ar centre bar display The display will be a solid bargraph but will have its zero point in the middle of the display If the seven segment display value is positive the bargraph will rise If the seven segment display value is negative then the bargraph will fall When scaling the display use the bAr and BAr functions e g bAr Gand bAr 136 will give a bargraph with all the bottom half segments lit at a 7 segment display reading of 9G and all the top segments lit with a 7 segment display reading of 82 e dot modulus or wrap around single dot bargraph This mode of operation allows the bargraph to wrap around the limits set by the b Ar and bAr functions b
44. graph will be free to move up and down to follow the live input Note that the L WE mode does not follow the electrical input if a remote input or button ZEFA operation has been undertaken This is due to the fact that the PEFD operation shifts the display calibration e OE temperature mode When set to temperature mode the retransmission will follow the temperature reading e P HLd peak hold mode The bargraph and 7 segment display will indicate the peak value only whilst the peak value function is operated via a contact closure on the remote input i e the bargraph and 7 segment display can rise but not fall whilst the remote input switch is closed When the remote input switch is opened the bargraph value will remain fixed i e it will not rise or fall although the 7 segment display value will be free to alter This peak bargraph reading can be cleared by closing the remote input switch for another operation or by temporarily removing power from the instrument Note In this mode the bargraph will show a zero reading until the remote input is operated for the first time after switch on e d Hid display hold mode The bargraph and 7 segment display value will be held whilst the remote input display hold switch is closed When the switch is opened the bargraph value will remain fixed at the held value although the 7 segment display value will be free to alter The held bargraph reading can be cleared by closing the remote input switch
45. i 5 28 26 dEPE Decimal point D D etc HH 5 29 26 Fler Digital filter O toB 2 5 30 26 PAPE Input polarity P amp S or RES PoS 5 317 2T POL UCAL Uncalibrate n a n a 5 32 27 on or Temperature sensor type NONE D0 AGKHE 5 33 27 YPE 000 1335 or Jte dEF Default solution temperature 6 5 to 286 6 25 3 5 34 27 bad CAL Calibrate temperature sensor n a n a 5 35 28 of UCAL Uncalibrate temperature sensor n a n a 5 36 28 or r c Analog output PI control an or DFF GFF 5 37 28 ctr Optional F3 RP Remote input external input MGKE AGKHE 5 38 28 function P Hid d Hid H Lo 5P Ae Mo Ale or dull Phut 2 button function AGHE WH ta NONE 5 39 29 or toa PAPE Input type PH or OF PH 5 40 30 EYMPE ACES Access mode GFF ERSY GFF 5 41 30 NONE ALL or CAL SPRE Setpoint access mode R LA i 2 etc Ri 5 42 30 Optional Optional this function will only be accessible if the relevant option is fitted PM4PHMAN 2 0 1 11 of 54 g rRb Grab calibration on or off on or GFF GFF 5 43 31 CAL Ax Alarm relay operation mode for Lo wE OC bo uE 5 44 31 each relay e g At AZ etc P HLd d Hid H Lo or d SP rec Analog retransmission output Lo wk OC be uE DAD 32 mode P Hid d Hid H Lo or d SP bAr Bargraph display operation by we OC Lo uE 5 46 33 mode Pid d Hid H Lo or d SP bAU Baud rate for serial 63 689 9600 5 47 34 FREE communications
46. int relay and or analog PI output if PI control is available The instrument must be set in the manner described below to allow the easy access facility to work 1 The F3 RP function must be set to SPRE or the REES function must be set to EASY 2 At least one alarm must have a setpoint nothing will happen if all the alarm setpoints are set to GFF 3 The SPRE function must be set to allow access to the relays required e g if set to A i 2 then the easy access will work only with alarm relays 1 and 2 even if more relays are fitted 4 The instrument must be in normal measure mode i e if the instrument is powered up so that it is in EAL mode then the easy access will not function If in doubt remove power from the instrument wait for a few seconds then apply power again 5 If the easy access facility is used then the only way to view or alter any other function settings is to power up via EAL mode i e there is no entry to FURE mode functions unless the instrument is powered up in EARL mode Note that if the RECS function is set to EAL then in addition to alarm relay easy access there will also be easy access to CAL 1 CALZ and UCAL GR functions PM4PHMAN 2 0 1 15 of 54 Explanation of Functions 5 1 Grab calibration Display Sr Ab CAL Range n a Default Value n a Used to initiate grab calibration procedure See Calibration chapter section 8 3 5 2 Grab calibration scale value Display SrAb SEL Range Any disp
47. lay control output bias Display FAir b5 Range D D to 66 3 Default Value 6 3 The control bias sets the ideal steady state output required once the setpoint is reached Settings are in from B D to 1500 50 When set at D D the relay will be de activated for the entire control period when the measured input is at the setpoint depending on proportional and integral gain settings If set at 5G then the relay operation frequency will on for 50 and off for 50 of the duty cycle time when the measured input is at the setpoint If set at amp G then the relay will activated for the whole time whist the measured input is at the setpoint 48 of 54 PM4PHMAN 2 0 1 9 9 PI relay control cycle period Display Fir de Range O to 25a Default Value i amp Displays and sets the control period cycle from amp to 50 seconds The control period sets the total time for each on off cycle This time should be set as long as possible to reduce wear of the control relay and the controlling device gt etc period period period 9 10 Setting up the PI pulse width controller 1 Set the Aa GPEF function to Av kP 2 Set the control setpoint Ax SP to the required setting 3 Set the control span ckr SPAR to the required setting 4 Set the proportional gain Axv P3 to an arbitrary value e g G 58 5 Set the integral gain Av 9 to G G8 i e off 6 Set the low and high integral Ar L and Ax H limits to an arbitrary value e g
48. lay value Default Value n a Used to enter grab calibration scale value See Calibration chapter section 8 3 5 3 Alarm relay low setpoint Display Arlo Range Any display value or GFF Default Value GFF Displays and sets the low setpoint value for the designated alarm relay x Note x will be replaced by the relay number when displayed e g A ito for relay 1 Use this low setpoint function if a relay operation is required when the display value becomes equal to or less than the low setpoint value To set a low alarm value go to the Arte function and use the or amp push buttons to set the value required then press J to accept this value The low alarm setpoint may be disabled by pressing the and amp push buttons simultaneously When the alarm is disabled the display will indicate GFF If the relay is allocated both a low and high setpoint then the relay will activate when the value displayed moves outside the band set by the low and high setpoints The value at which the relay will reset is controlled by the AaH function Example IfA iLa is set to iD then relay 1 will activate when the display value is 10 or less 16 of 54 PM4PHMAN 2 0 1 Display Value Relay resets Relay above this activates value at this value or below Rack value Alarm low operation with hysteresis Time 5 4 Alarm relay high setpoint Display Ar H Range Any display value or BFF Default Value GFF Displays and sets
49. ler will respond when there is a difference error between the measured value and the process setpoint If the proportional gain is increased then for a given error the relay on time will be increased or decreased if the error is on the other side of the setpoint The proportional gain action can be reversed by setting a negative gain i e with a negative gain the on time will reduce as the error increases With a proportional gain of 4 amp 8 and an error of 8 or more with control span set at 45 the controller will increase the frequency by 100 if possible With a proportional gain of 8 5 G an error of 40 or more with control span set at 4 5 will cause the controller to increase the frequency by 50 if possible Too much proportional gain will result in instability due to excessive overshoot of the setpoint Too little proportional gain will lead to a slow response PROCESS A Proportional gain Ideal too high gt SETPOINT Joc A Proportional gain too low TIME PM4PHMAN 2 0 1 45 of 54 This table shows the effect of the output frequency of changing proportional gain and bias with the following settings ctr SPAN 20 Aide L0 A 1 9 0 000 165 Effect on relay operation ad ID my vu my vu fa R D C3 C3 3 3 5 Reading of 5 4 or below relay permanently on Reading of 5 4 to 4 0 relay pulses with off time increasing as value approaches 7 8 Reading 7 4 or
50. ll activate when the display value is IDD or higher and will reset at a display value of 89 or lower 5 6 Alarm relay trip time Display Arke Range D to 9999 Default Value amp Displays and sets the alarm trip time in seconds The trip time is common for both alarm high and low setpoint values The trip time provides a time delay before the alarm relay will activate when an alarm condition is present The alarm condition must be present continuously for the whole trip time period before the alarm will activate If the input moves out of alarm condition during this period the timer will reset and the full time delay will be restored This trip time delay is useful for preventing an alarm trip due to short non critical deviations from setpoint The trip time is selectable over D to F494 seconds To set a trip time value go to the Artt function and use the B or M push buttons to set the value required then press I to accept this value Example If A itt is set to amp seconds then the display must indicate an alarm value for a full 5 seconds before relay 1 will activate 18 of 54 PM4PHMAN 2 0 1 5 7 Alarm relay reset time Display Arre Range D to 9999 Default Value amp Displays and sets the alarm reset delay time in seconds The reset time is common for both alarm high and low setpoint values With the alarm condition is removed the alarm relay will stay in its alarm condition for the time selected as the reset time If the input
51. ly this function allows selection of standard alarm on off setpoint operation A LAL or R2 AL using the alarm functions described in this chapter or PI control operation A LEP or A Fr or A k P or A2 F er To set the alarm operation mode go to the Ar GPEr function and use the amp or Ad push buttons to choose the required operation then press to accept this value Refer to the Setting up the relay PI controller chapter 9 for details of the PI control operations and functions Example With Ar GPE set to A Fer relay 1 will operate as a PI control relay with the frequency of the relay varying 5 11 Display brightness Display br Ge Range ito i5 Default Value 5 Displays and sets the digital display brightness The display brightness is selectable from to 5 where 4 lowest intensity and 45 highest intensity This function is useful for improving the display readability in dark areas or to reduce the power consumption of the instrument See also the duit function 5 12 To set brightness level go to the br Gt function and use the B or M push buttons to set the value required then press I to accept this value 20 of 54 PM4PHMAN 2 0 1 5 12 Display remote brightness switching Display duit Range Gto iS Default Value Displays and sets the level for remote input brightness switching see F RP function When a remote input is set to duit the remote input can be used to switch between the display brightness level s
52. me inputs e SFU RM Err or Std Err these messages indicate a faulty attempt at calibration has been made Check that the input pH or Redox levels correspond to the scale values input e g if you place the electrode in 4pH buffer and try to enter the value for this input as 7pH you may get one of these error messages e Unstable display if the display is not stable the usual cause is either that the input signal is unstable or that the calibration scaling was incorrectly attempted If the calibration scaling was unsuccessful then uncalibrating the display at the UCAL GF function should return the display to stable readings but the previous calibration scaling values will be lost If the display is still not stable after uncalibrating then check the sensor PM4PHMAN 2 0 1 35 of 54 7 Display shows this message indicates that the input signal is higher than is acceptable for the pH or ORP expected levels Check that the RPE amp YPE function selection matches the sensor being used or PE EYPE if this error message is seen on the temperature display Display shows er this message indicates either that the number is too big to display e g above 99999 on a 5 digit display Check the input and recalibrate if necessary If this message is seen as a live reading during calibration ignore the message and continue with the calibration procedure then check the results If this message is seen as the temperature reading it could indi
53. moves back into alarm condition during this period the timer will reset and the full time delay will be restored The reset time is selectable over G to 9999 seconds To set a reset time value go to the Arr t function and use the or S push buttons to set the value required then press I to accept this value Example IfA irt is set to seconds then the resetting of alarm relay 1 will be delayed by 10 seconds 5 8 Alarm relay normally open closed Display Ron a or Rane Range Rin a or Rane Default Value FAan a Displays and sets the setpoint alarm relay x action to normally open de energised or normally closed energised when no alarm condition is present Since the relay will always open when power is removed a normally closed alarm is often used to provide a power failure alarm indication To set the alarm relay for normally open or closed go to the Azm a or Arn e function and use the Q or Rd push buttons to set the required operation then press J to accept this selection Example If set to A tn a alarm relay 1 will be open circuit when the display is outside alarm condition and will be closed short circuit across terminals when the display is in alarm condition 5 9 Alarm relay setpoint or trailing operation Display FAicSP or Act fetc Range FAicSP or Act fetc Default Value FAxSP Relay operation independent setpoint or trailing setpoint this function will not be seen unless extra optional relays are fitted Each alarm
54. n and use the or B push buttons to set the value required then press I to accept this value The hysteresis value is common to both high and low setpoint values The hysteresis value may be used to prevent too frequent operation of the relay when the measured value is rising and falling around setpoint value e g if A fHY is set to zero the alarm will activate when the display value reaches the alarm setpoint for high alarm and will reset when the display value falls below the setpoint this can result in repeated on off switching of the relay at around the setpoint value The hysteresis setting operates as follows In the high alarm mode once the alarm is activated the input must fall below the setpoint value minus the hysteresis value to reset the alarm e g if A iH is to 50 0 and A EHY is set to 3 4 then the setpoint output relay will activate once the display value goes to 58 8 or above and will reset when the display value goes below 7 0 ie at 45 9 or below In the low alarm mode once the alarm is activated the input must rise above the setpoint value plus the hysteresis value to reset the alarm e g if A iLa is to 23 6 and A H4 is set to 4 then the alarm output relay will activate when the display value falls to 28 3 or below and will reset when the display value goes above 33 8 i e at 3G i or above The hysteresis units are expressed in displayed engineering units Example IfA iH is set to DO and A HY is set to iD then relay 1 wi
55. n will now be adjusted to the new value 7 Press the GJ button to exit to normal measurement mode 40 of 54 PM4PHMAN 2 0 1 8 4 Redox calibration If the Redox display scaling needs to be checked or the electrode calibrated then follow the method below The method used for pH calibration see section 8 2 can also be used for Redox calibration Two Redox buffers may be used if calibrating from the Redox electrode input or two known mV input levels from an external source may be used as the inputs e g OmV for CAL SEL and 500mV for CRL2 SEL Using buffer solutions ensure that the buffers have different mV values Typical mV buffer solutions are ZoBell which has a value of 186mV at 25 C and quinhydrone added to a know pH buffer solution mV value depends upon concentration and temperature Ready made buffer solutions of various mV values are commercially available 8 5 pH and Redox uncalibration Uncalibrate pH or Redox Used to set the instrument back to the factory calibration values This function is only used when calibration problems exist and the calibration memory needs to be cleared other settings are not affected To uncalibrate the instrument pH or Redox reading press the and M buttons simultaneously at the HEAL ON function The display message HEAL End should be seen and the display will move to the next function 8 6 Temperature calibration A single step temperature calibration function is provided For a
56. ns Decrease integral gain 9 11 Relay frequency modulation control mode To use pulse width modulation control Ax Fr must be selected at the Ax GPE function In frequency modulation mode the relay on time is fixed A minimum relay off time can also be set The control program will vary the actual off time to suit the error seen between the setpoint and the measured temperature at the time For example if extra dosing is needed to reach the setpoint then the off time will be reduced resulting in more on pulses per period of time i e the frequency of the pulses is controlled to allow the setpoint to be maintained Frequency control pulse frequency varies according to settings and control requirement on Relay off time on Relay off time Frequency PI control operation has many functions in common with PI pulse width control refer to the appropriate sections as shown below for these common functions Ax SP Control setpoint refer to section 9 2 ctr SPAN Control span refer to section 9 3 Ax P9 Proportional gain refer to section 9 4 Ax 9 Integral gain refer to section 9 5 Ax L Integral control low limit refer to section 9 6 Ax H Integral control high limit refer to section 9 7 Ax b5S PI control bias refer to section 9 8 Ax de PI control cycle period refer to section 9 9 In frequency mode this function sets the minimum off time If set to G the relay will be disabled The control program can extend th
57. oltmeter or multimeter If the reading from the electrode is correct but the display is not showing the same value then uncalibrate the display using the VEAL GF function If necessary perform a 2 point calibration after the uncalibration procedure If the display is still not accurate or if error messages persist during calibration check the output from the electrode again if this is still OK place a short circuit across the Redox input The display should show Om V if it does not show a value very close to OmV then the display will need to be returned for service PM4PHMAN 2 0 1 37 of 54 8 Calibration Offset calibration and grab sample calibration methods are provided for single point calibration adjustment The 2 point calibration method EAL and CALZ is used to fully calibrate the display to the pH electrode output slope The CA and CALZ scaling functions may be set independently The two point calibration method should be undertaken when a new electrode is installed and during periodic calibration checks Single point calibration adjusts the offset of the input whereas two point calibration also adjusts the slope of the input Whilst single point calibration is acceptable for routine checks it is essential that a two point calibration is carried out periodically Chapter 5 which shows the method of entering EAL mode to gain access to calibration functions Easy access to CAL CALZ and UCAL GA functions is possible by settin
58. onal this function will only be accessible if the relevant option is fitted Functions in this second table are available only in ZAL mode or if REES is set to ALL Display Function Range Default Your Ref Page record 9 fAb Grab calibration n a n a 8 3 40 CAL g Ab Grab calibration scale value Any display n a 5 2 16 EL value Ar5SP Relay operation independent RAicSP or Fic SP See 5 9 19 or setpoint or trailing setpoint Arte fete 4 1 Fick Optional etc Ar Relay operation mode alarm or Ax AL or Ar AL See 5 10 20 GPEr PI control Fiv eP or 4 1 Ar Fr ctr PI relay control span Any display igg See 9 3 44 SPAR value 4 1 Optional this function will only be accessible if the relevant option is fitted PM4PHMAN 2 0 1 9 of 54 FAir P9 PI relay proportional gain 32 7157 to 6 3 iG See 9 4 45 32 767 4 1 Act 9 PI relay integral gain 32 757 to 6 053 See 9 5 46 32 767 4 1 Fic L PI relay integral control low limit G to 83 3 103 3 See 9 6 47 4 1 Act H PI relay integral control high O D to 86 5 133 3 See 9 7 48 limit 4 1 Ar b5 PI relay control output bias D D to 100 0 3 5 See 9 8 48 4 1 Fir de PI relay control cycle period Sto 25a ig See 9 9 49 4 1 Axr dr PI relay on duration 6 8 to 25 8 ig See 9 12 51 4 1 br Sek Display brightness level ito amp is 5 11 720 dull Display remote brightness Gto i5 i 5 12
59. ormal display value of 10 or less then the alarm will operate This will be the normal setting used unless one of the special modes which follow is required e OE temperature mode When set to temperature mode the alarm relay will operate from the temperature reading i e setpoint will be in C rather than pH or ORP e P HLd peak hold mode If the peak hold mode is used and the remote input is set to peak hold then once the peak display goes above any alarm high setpoint the alarm relay will activate and will not de activate until the peak hold is released and the display value falls below the setpoint value e d Hid display hold mode If the display hold mode is used and the remote input is set to display hold then the alarm relay will be held in its present state activated or de activated until the display hold is released and the display is free to change e H peak max memory mode If the peak memory mode is used and the remote input is set to peak memory then the alarm will be activated if the peak memory value is above the high setpoint value The alarm will not de activate until the memory is reset e La valley min memory mode If the valley memory mode is used and the remote input is set to valley memory then the alarm relay will be activated if the valley memory value is below the low setpoint value The alarm will not de activate until the memory is reset PM4PHMAN 2 0 1 31 of 54 e d SP display mode If the displ
60. r front panel depending on model The and M pushbuttons may be used to toggle the display between pH and solution temperature C reading or default temperature if no external sensor is used A standard inbuilt relay provides an alarm control function optional extra relays retransmission analog serial or digital and DC output voltage may also be provided The PM4 is available with a 4 5 or 6 digit display or combined bar graph 5 digit display to suit various applications Unless otherwise specified at the time of order your PM4 has been factory set to a standard configuration Like all other PM4 series instruments the configuration and calibration is easily changed by the user Initial changes may require dismantling the instrument to alter PCB links other changes are made by push button functions Full electrical isolation between power supply input voltage or current and retransmission output is provided by the PM4 thereby eliminating grounding and common voltage problems This isolation feature makes the PM4 ideal for interfacing to computers PLCs and other data acquisition devices The PM4 series of panel mount monitors are designed for high reliability in industrial applications The high brightness LED display provides good visibility even in areas with high ambient light levels 1 2 Standard outputs e A standard inbuilt relay provides an alarm control function can be set for on off alarm control or PI control using pulse width or f
61. ral Ar L and Ax H limits to an arbitrary value e g 23 88 7 Set the bias Av b5 to 50 0 8 Set the cycle Ax de period to 2G seconds 9 Set the relay on time Ax dr to an arbitrary value e g 1G Initialise the control system and monitor the control results If the original settings causes process oscillations then gradually decrease the proportional gain until the oscillations decrease to an acceptable steady cycle If the original settings do not cause process oscillations then gradually increase the proportional gain until a steady process cycling is observed Once the steady cycling state is achieved note the difference between the display value and the control setpoint value Gradually increase or decrease the bias value until the displayed value matches or cycles about the control setpoint value Gradually increase the integral gain until the process begins to oscillate Then reduce the integral gain slightly to regain the control without this added oscillation Create a step change to the process conditions and observe the control results It may be necessary to fine tune the settings and use integral limits to obtain optimum results Set up sequence Symptom Solution Proportional gain Slow response Increase proportional gain Proportional gain High overshoot or oscillation Decrease proportional gain Proportional bias Process above or below setpoint Increase or decrease bias as required Integral
62. requency control 1 3 Output options e 1 3 or 6 extra relays first optional relay can be set for simple on off alarm control or PI control using pulse width or frequency control e Isolated analog retransmission single or dual analog outputs configurable for 4 20mA 0 1V or 0 10V The first analog output is configurable for retransmission or PI control e 12VDC 24V isolated transmitter supply excitation voltage 25mA max e Isolated RS485 or RS232 serial communications ASCII or Modbus RTU e Isolated Digital output binary or BCD up to 16 bit NPN or PNP output types available e Isolated Optional outputs are available in certain combinations e g Extra relay plus RS232 PM4PHMAN 2 0 1 3 of 54 2 Mechanical Installation Choose a mounting position as far away as possible from sources of electrical noise such as motors generators fluorescent lights high voltage cables bus bars etc An IP65 access cover which may be installed on the panel and surrounds is available as an option to be used when mounting the instrument in damp dusty positions A wall mount case is available as an option for situations in which panel mounting is either not available or not appropriate A portable carry case is also available as an option for panel mount instruments Prepare a panel cut out of 45mm x 92mm 1 mm 0 mm see diagram below Insert the instrument into the cut out from the front of the panel From the rear of the instrument fit the
63. ss for optional serial communications Display Addr Range Gto wi Default Value amp Set unit address for polled PGLL mode G to 3 4 seen only with serial output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when optional outputs are fitted Allows several units to operate on the same RS485 interface reporting on different areas etc The host computer or PLC may poll each unit in turn supplying the appropriate address The unit address ranges from 0 to 31 DEC but is offset by 32 DEC to avoid clashing with ASCII special function characters such as lt STX gt and lt CR gt Therefore 32 DEC or 20 HEX is address 0 42 DEC or 2A HEX is address 10 5 51 Returning to normal measure mode When the calibration has been completed it is advisable to return the instrument to the normal mode where calibration functions are less likely to be tampered with To return to normal mode turn off power to the instrument wait a few seconds and then restore power 6 Error messages e SPAM Err calibration span error Live inputs used at CAL i and CALZ too close in value Recalibrate using inputs further apart in value If you are certain that the inputs are far enough apart but still see the SPAM Err message then ignore the message and continue with the two point calibration At the end of the calibration check to see if the display calibration is correct and if not recalibrate using the sa
64. tal output option high value Display d 97 Range Any display value Default Value D00 Seen only with the 16 bit digital output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted Determines the high scaling point for the amp S L mode and has no effect on other modes Example Ifd 9 issettoGanda amp 97 isset to 55535 2 1 then the retransmission will not be scaled i e a display of 2 will cause a retransmission of 2 If d 97 is now changed to 3276 7 2 1 then a display of 2 will cause a retransmission of 4 note rounding may occur on retransmission 5 21 Analog output option low value Display FEC Range Any display value Default Value amp Seen only when analog retransmission option fitted Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted for wiring details and link settings Displays and sets the analog retransmission 4 20mA 0 1V or 0 10V link selectable output low value 4mA or OV in displayed engineering units To set the analog output low value rer go to the FEE function and use the or amp push buttons to set the required value then press G to accept this selection Example If it is required to retransmit 4mA when the display indicates G then select G in this function using the amp or amp button 5 22 Analog output option high value Display FECT
65. termining the display value and is used for reducing display value variation due to short term interference The digital filter range is selectable from amp to B where D none and B most filtering Use or at the FLEr function to alter the filter level if required Note that the higher the filter setting the longer the display may take to reach its final value when the input is changed similarly the relay operation and any output options will be slowed down when the filter setting is increased To set the digital filter value go to the Ft tr function and use the Bor push buttons to set the required value then press I to accept this selection 26 of 54 PM4PHMAN 2 0 1 5 31 Input polarity Display PRP POL Range PGS o Default Value P amp S Allow selection of P amp S positive or REY negative input polarity for the pH or ORP input signal For most applications PGS would be used Use RES if the electrode signal has been inverted e g if an inverting amplifier is used between the electrode and the display 5 32 Uncalibrate Display UCAL DRN Range n a Default Value n a Uncalibrate resets calibration See Calibration chapter section 8 5 5 33 Temperature sensor type Display oE EYPE Range NONE 105 1005 L335 or Jte Default Value MONE Displays and selects the input sensor type being used Select from MORE no temperature sensor GG 100Q RTD or Pt100 BEG 1000Q RTD or Pt1000 amp 33S LM335 semiconductor
66. the high setpoint value for the designated alarm relay x Note x will be replaced by the relay number when displayed e g A iH for relay 1 Use this high setpoint function if a relay operation is required when the display value becomes equal to or more than the low setpoint value To set a high alarm value go to the Ax H function and use the or amp push buttons to set the value required then press I to accept this value The high alarm setpoint may be disabled by pressing the and amp push buttons simultaneously When the alarm is disabled the display will indicate GFF If the relay is allocated both a low and high setpoint then the relay will activate when the value displayed moves outside the band set by the low and high setpoints The value at which the relay will reset is controlled by the AaH function Example IfA iH is set to DU then relay 1 will activate when the display value is IBE or higher Display Value Arh t 5 minus Relay AxrHY activates at this value Relay or above resets below this value gt Alarm high operation with hysteresis Time PM4PHMAN 2 0 1 17 of 54 5 5 Alarm relay hysteresis deadband Display ArH Range D to 9999 Default Value 3 Displays and sets the alarm relay hysteresis limit for the designated relay x Note x will be replaced by the relay number when displayed e g A fH for relay 1 To set a relay hysteresis value go to the AxHY4 functio
67. tings Start with a low figure e g G 2 amp 38 and increase until a satisfactory response time is reached The integral gain figure has units of gain minute The integral action can be reversed by setting a negative gain figure note that the sign of the integral gain must match the sign of the proportional gain The integral control output follows the formula error x Ig x time seconds 60 Integral control output previous integral control output Where Ig is the integral gain set via Ax 93 PROCESS Ideal Integral gain too high SETPOINT TIME 9 6 PI relay integral control low limit Display Ar L C3 m Malaig ad CO CESES S Range Default Value 33 3 The minimum limit can be used to reduce overshoot of the control setpoint when the control output is being reduced i e falling below the setpoint The low limit reduces the available output swing by a percentage of the maximum output Without a limit the integral output can be very large at PM4PHMAN 2 0 1 AT of 54 the time the setpoint is reached and a large overshoot of the will then result Settings available are from B D to 98 8 If the limit setting is too high then overshoot will result If the setting is too low then the integral output can be limited to such an extent that the setpoint cannot be maintained Start with a low value such as 2 amp amp and increase or decrease the value until a satisfactory result is obtain
68. tputs refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when options are fitted Instrument rear connections example O O A B C D E F H J K ae 1l2l3l4 slo hoh BO EEE Pe OOo O o D N MAINS EARTH COM N O ELECTRODE INPUT AC NEUTRAL DC RELAY 1 RD RTD 3rd WIRE AC ACTIVE DC EXT IN E ELECTRODE amp RTD GND Instrument label example 1 MAINS EARTH 2 240 VAC NEUTRAL 3 240 VAC ACTIVE 5 RELAY 1 CoM 6 RELAY 1 N O 7 EXT INPUT 8 GROUND 9 RTD 3W 10 RTD 11 pH INPUT PM4 PH 240 5E SERIAL No XXXXX XXX PM4PHMAN 2 0 1 5 of 54 3 2 Electrical connection examples If output options are fitted refer to the PM4 Panel Meter Optional Output Addendum booklet for connection details Electrode and temperature sensor wiring 2 Wire RTD or thermistor 3 Wire RTD LM335 GND 3W RTD Input GND 3W RTD Input GND 3W_ RTD Input 2 Wire RTD or 3 Wire RTD LM335 Sensor Balco thermistor Shield pH or Redox electrode pH or Redox electrode pH or Redox electrode Termination of a typical pH electrode with temperature compensation Centre core Red Tab Shield Black Tab Temperature sensor wires RTD and thermistor temperature sensors are not polarised and therefore the wires may b
69. two mounting brackets into the recess provided see diagram below Whilst holding the bracket in place tighten the securing screws being careful not to over tighten as this may damage the instrument Hint use the elastic band provided to hold the mounting bracket in place whilst tightening securing screws Vertical mounting bar graph displays Horizontal mounting ie 92mm 4 45mm PANEL CUT OUT Poe l g2mm OUT Mounting bracket 2 off Se fmm 10mm 48mm 4 of 54 PM4PHMAN 2 0 1 3 Electrical installation 3 1 Electrical installation The PM4 Panel Meter is designed for continuous operation and no power switch is fitted to the unit It is recommended that an external switch and fuse be provided to allow the unit to be removed for servicing The plug in screw type terminal blocks allow for wires of up to 2 5mm to be fitted Connect the wires to the appropriate terminals as indicated below The power supply type is factory configured Check supply type before connecting Relay outputs are voltage free type When power is applied the instrument will cycle through a display sequence indicating the software version and other status information this indicates that the instrument is functioning Acknowl edgement of correct operation may be obtained by applying an appropriate input to the instrument and observing the reading The use of screened cable is recommended for signal inputs For connection details of optional ou
70. utomatic temperature compensa tion of pH reading a temperature sensor should be used in most cases the temperature sensor is inside the pH electrode The temperature can be viewed via the front The steps for pH temperature sensor calibration are e Place the temperature sensor in a solution of known temperature e At the CAL PC function press the ZB and M pushbuttons simultaneously A live input reading from temperature sensor will be seen Allow the reading to stabilise then press the button e The display will show PE followed by a value Use the or pushbutton to make the value read the known temperature of the solution e Press the J button to accept the change the display should show the message PE End then move on to the next function 8 7 Temperature uncalibration Used to set the instrument back to the factory temperature calibration values This function is only used when calibration problems exist and the calibration memory needs to be cleared other settings are not affected To uncalibrate press the Z and amp buttons simultaneously at the UERL PM4PHMAN 2 0 1 41 of 54 o function The display will show the message UCAL End to indicate that the uncalibration process is complete A2 of 54 PM4PHMAN 2 0 1 9 Setting up the relay PI controller The Relay Proportional Integral Controller can be made to operate in either pulse width control or frequency control mode via the Ax GPE r function Note that the Ax GPE fun
71. wer up sequence plus push button sequence allows access to all functions including calibration parameters Once CAL or FUNE mode has been entered you can step through the functions by pressing and releasing the push button until the required function is reached Changes to functions are made by pressing the or push button in some cases both simultaneously when the required function is reached See the flow chart example on the following page Entering CA Mode Entering Fufit Mode 1 Remove power from the instrument Hold in the B button and reapply power The display will briefly indicate CAL as part of the wake up messages when the EAL message is seen you can release the button Move to step 2 below No special power up procedure is required to enter FUNE mode 2 When the wake up TAAS 1 When the wake up messages have finished messages have finished and the display has settled and the display has settled down to its normal reading down to its normal reading press then release the press then release the button B button Move to step 3 below CENO 3 Within 2 seconds of CENT 2 Within 2 seconds of releasing the G button press then release the and M buttons together The display will now indicate FUE followed by the first function Note If step 1 above has been completed then the instrument will remain in this AL mode state until power is removed i e there is no need to repeat
72. y dividing the 7 segment display by the modulus the modulus is the difference between 0 and bAr and displaying the remainder For example if bAr is set to G and bAr is set to D then in other bargaph modes when the 7 segment display reads a value such as 5 the bargraph would be stuck at the high limit of its travel since it cannot go beyond In r dot mode the display will wrap around at then continue up the bar again and will be at the midpoint of the bargraph when the 7 segment display shows 5 as it would for a 7 segment display of 5 35 etc In this example for a 7 segment display of 25 the value of 25 is divided by the modulus value of 10 in this example and the remainder displayed i e 10 goes into 25 twice with the remainder of 5 and so a bargaph position of 5 is displayed This mode will operate on both vertical and circular bargraph type displays 22 of 54 PM4PHMAN 2 0 1 5 16 Digital output option mode Display d3OP Range bed b6 50L b nor amp ne Default Value b n Seen only with the 16 bit digital output option Refer to the separate PM4 Panel Meter Optional Output Addendum booklet supplied when this option is fitted Selections available are b ng signed binary i e 32767 to 32767 b m unsigned binary i e 0 to 65535 b SEL scaled binary seed 9 and d 97 below bed binary coded decimal i e up to four BCD numbers 5 17 Digital output option polarity Display d3 0P Range FU a or AH

AIC PM4-PH Meter User Manual

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