User Manual 2-wire field indicator 311 / 312
Contents
1. 4 samples s 2 5 mm detachable aoo 1700 C B C 0 D 0 E 100 900 C G 1000 2200 C J 150 900 C K 150 1350 C L 100 900 C N 0 1300 C R 0 1700 C S 0 1700 C T 150 400 C Internal 0 1 of spanor 1 C 0 4 C 0 05 C C Negligible below 1 KQ 200 700 C 0 00385 3 or 4 wire approx 0 3 mA 0 15 C 0 05 rdg 0 03 C C lt 30 O wire 200 300 C 60 175 C 0 1000 Q Three wire slidewire mV input Range Accuracy at 25 C Linearity Input impedance V input Measurement range Standard ranges Input impedance Accuracy at 25 C Linearity mA input Measurement range Standard ranges Input impedance Accuracy at 25 C Linearity IR sensors Types and 440F K Range 140F K Range 440F K Emissivity correction Output 50 500 Q 100 4100 mV 10 uV 0 02 rdg 0 01 gt 10 MQ 10 10 V 0 5 V 0 10 V 1 MQ 3 mV 1 mV 20 20 mA 0 20 mA 4 20 mA 5Q 6 pA 0 01 Exergen 140F K 40 350 C 30 600 C Freely adjustable Range Accuracy at 25 C 4 20 mA or 20 4 mA 0 1 of span Output limiter 21 mA typ Sensor break indication 3 8 or 21 mA Power supply range 10 28 VDC Ohm 1000 800 600 400 200 0 10 14 18 22 26 30V Thermal drift 0 005 C Connectors 2 5 mm detachable Configuration With front panel keys or alter2. 1 disabled Sensor break detection Submenu for linearization table Enable the tare function Configuration menu Main level In Submenu for input settings Out Submenu for analog output settings Alm1 Submenu for alarm 1 settings Alm2 Submenu for alarm 2 settings Cfcode Password for the configuration menu Alcode minimum maximum memory Input settings Password for the operator menu quick editing the alarm values and resetting the These settings are located in the In submenu of the configuration menu Sensor Input sensor or signal type Selection Explanation Lo Hi scaling mV Millivolts up to 100 mV V Volts up to 10 V mA Milliamps up to 20 mA 0 5V 0 5 V scaled input Yes 0 10V 0 10 V scaled input Yes 0 20mA 0 20 mA scaled input Yes 4 20mA 4 20 mA scaled input Yes TcB TcC TcD TcE TcG TcJ Thermocouples TcK TcL TcN TcR TcS TcT E140 E440 Exergen infrared thermocouples Ohm Resistance measurement including a potentiometer in a variable resistance configuration Pt Ni RTD sensors Pot Potentiometer in a slidewire configuration Yes Bip Bipolar measurement on mV V and mA signals Off The device can t measure below 0 V nor 0 mA On The device can measure down to 100 mV 10 V and 20 mA but with slightly diminished resolution 4W Four wire connection on RTD s and resistance measurement Off 3 wire measurement On 4 wire measurement Lo With 0 5V 0 10V 0 20mA 4 20mA and Pot inputs The
3. There are no means to de tare except by switching this setting off Lin submenu The Lin submenu is used for custom linearization of the input To enable the linearization set Use Yes Enter six sample pairs X values are unlinearized scaled input values C F mV or whatever while Y values are the corresponding linearized display values The X and Y values may be selected freely but the X values must be in ascending order the smallest first Linear interpolation extrapolation is used between outside the points Out submenu The Out submenu is used for the analog output signal settings Lo The displayed engineering reading at which the output signal is at its lowest value 4 mA Hi The displayed reading at which the output signal is at its highest value 20 mA To achieve an inverted output 20 4mA swap the Lo and Hi values Mode Off The output not used fixed at 8 mA The display is at the maximum intensity all the time 9 Limit Limited between 4 and 20 mA no overranging Full Can overrange from approx 3 8 mA to approx 21 mA Break Output state at sensor wire fault Dscale The output driven to its minimum value 3 8 or 4 0 mA depending on Mode Uscale The output driven to its maximum value 20 or 21 mA Alarm submenus There are two alarm submenus Alm1 and Alm2 for two alarm relays These are identical If the alarm option is not fitted the alarms can still be used for visual in
4. low end scaling i e the reading displayed on the low end of the range With other inputs Offset correction will be added to the reading Usually 0 Hi With 0 5V 0 10V 0 20mA 4 20mA and Pot inputs The high end scaling i e the reading displayed on the high end of the range With mV V mA and ohm A multiplier applied to the reading before applying the offset Lo setting Emis Slope correction for thermocouples or emissivity correction for Exergen infrared thermocouples Normally set to 1 The temperature difference between the measured sensor temperature and the ambient temperature is divided by the Emis setting and added to the ambient temperature to get the displayed reading In other words the slope of the thermocouple reading is amplified by 1 Emis when distancing from the ambient temperature The ambient temperature is obtained from the internal cold junction compensation RO The nominal resistance of the Pt or Ni sensor i e the resistance at 0 C For a Pt100 select 100 This can also be used to fine tune the slope If the resistance of the sensor has been calibrated at 0 C the exact resistance can be entered here Unit Measurement unit C or F Only for Pt Ni and thermocouples Dec The number of digits displayed on the right hand side of the decimal point Selectable between 2 and 3 If the digits won t fit in the display the decimal count is automatically decreased temporarily A negative value me
5. with To edit the value of a setting Conf menu Item 1 Edit value Edit value Submenu push gt to start editing Use AVP to edit and to get back to the menu Edit value La gt Item 3 Item 3 1 Item 3 2 The menu is organized hierarchically You can enter Out Alm1 Alm2 and Lin submenus by selecting them with A V keys and entering the submenu with the P key See the menu chart When all settings are done exit from the menu with key Two options are shown save to keep the settings made and undo to discard all changes Select Save or Undo and push P The contents of the configuration state are detailed in the chapter Configuration menu A quick overview is shown below The items on the shaded background are hidden in certain cases Analog output Low end scaling Hi High end scaling Limited overranging Config password Operator password Fault indication Alm1 2 Alarms model 312 Low or high alarm Alarm activation level Hysteresis Input Input sensor type Bipolar measurement on mV V mA Off 3 wire connection On 4 wire Low end scaling or offset High end scaling Emissivity slope correction on tc s Nominal resistance of an RTD Temperature unit C or F Displayed decimals Low pass filter time constant in secs Slew rate limiter 0 disabled Dead zone
6. User Manual 2011 02 21 firmware V1 1 2 wire field indicator 311 312 Nokeval m mxm wm Conf Nw Nokeval Introduction The field display 311 is a versatile instrument combining a two wire 4 20 mA transmitter and an LED display accepting almost all common sensor inputs It can be powered with a 10 30 VDC supply if an analog output is not needed The galvanic isolation provided is especially important with thermocouples but helps to avoid potential differences in other applications too The device can be configured with the front panel buttons The device is housed in a splash proof wall mounted enclosure The model 312 is equipped with two semiconductor relay alarm outputs The relays are rated for 250 VAC Warnings Although the input circuitry is galvanically isolated the isolation is purely functional and intended to prevent the problems associated with ground loops and potential differences The input signal must not be connected to a voltage higher than 120 VDC or 50 VAC with respect to earth When using a line voltage with the alarm relays the associated wires must be tied so that they can t come in contact with the other parts inside the unit in case of accidentally detaching from the connector Trademarks Exergen is a registered trademark of Exergen Corporation USA Manufacturer l Nokeval Oy Yritt j katu 12 FI 37100 Nokia Finland tel 35833424800 Installing Connections The con
7. ans that there are no decimals and that the corresponding amount of rightmost digits will be rounded off E g Dec 2 the display is rounded to O 100 200 etc Lopass A first order digital lowpass filter for input Used to damp noise and transient disturbances in the reading Set the time constant to 63 of step change in seconds Recommended value 1 To disable the filtering set to 0 Slew Slew rate limiter Prevents the input reading from changing too rapidly Defines how much the new reading can differ from the previous one New readings are acquired about 3 times second so a setting of 1 limits the slew rate to about 3 C s To disable set to 0 Dead Dead zone around zero If the input reading is smaller than the Dead value the display is rounded to zero This is useful in weighing and flow measurement applications To prevent negative values only set Dead to 0 To disable the dead zone function set Dead to 1 or any other negative value Pullup Sensor break detection by injecting a small current in the sensor wires Normally enabled but can be switched off if the current is disturbing a high impedance sensor Lin A submenu for a six point linearization table See below Tare Tare function used in weighing applications If switched on this unit can be tared zeroed on the front panel Press in the normal state to tare Current reading will be stored in non volatile memory and subtracted from all readings this on
8. dication at the front panel Type The alarm type Lo Hi LoNc and HiNc Lo means low level alarm and Hi high level alarm Nc means inverse operation at the relay the contacts open when the alarm activates Level The alarm activation level in the display engineering units Hyst The alarm hysteresis When the alarm has activated the input reading must fall under the level Hi alarm or rise above the level Lo alarm by the Hyst value for the alarm to deactivate Example High level alarm at 100 C Hyst 5 The alarm activates at 100 and deactivates at 95 C Set the hysteresis in the display engineering units not percent and always positive Manual reset hold If the Hyst value is very large e g 9999 the alarm will never deactivate unless manually reset in the Operator menu see chapter Operator menu on the page 5 10 Environmental Specifications Operating temperature Storage temperature Humidity Protection Pollution degree Altitude Inputs 0 60 C 20 70 C 0 95 RH IP 65 2 Max 2000 m Common Galvanic isolation Measuring rate Connectors Thermocouples Types and ranges Cold junction Calibration accuracy Linearization error CJ compensation error Sensor wire influence Pt100 Range Alpha Connection Sensor current Accuracy at 25 C Thermal drift Max wire resistance Pt500 Pt1000 Range Ni100 Range Potentiometer input Two wire resistance 1000 VDC 1 min 3
9. ed from the analog output The reading can be scaled or adjusted linearly and optionally treated with a 6 point linearization table Two digital filters are provided 1 degree lowpass filter and a slew limiter These can be used to decrease input noise and response to transient fluctuations A tare function is provided for weighing applications When taring the device with the button the reading is offset appropriately to get a zero reading at this input signal The tare value is retained even ina power off situation The Dead function allows preventing small or negative readings useful in weighing and flow measurement applications The analog output and the alarms follow the displayed reading processed with all of the functions mentioned above Cleaning The device can be cleaned externally with a soft cloth and soap water Cleaning with a small amount of isopropyl alcohol is also allowed User interface Config state LED Maximum memory Minimum memory Alarm indicators Nakeval as 5620 J Ta Select Exit Enter operator menu Unit label Normal state In normal state this device displays the current measurement value continuously functioning as an indicator The A1 and A2 LEDs indicate the current state of the alarms The device is in this state after power up If the tare function is enabled in the configuration menu you can tare the unit by
10. natively Connection Nokeval POL at a three pin header Baud rate 9600 bps Serial protocol Nokeval SCL Meku 1 address 0 slot 0 Display Digits 4 digits red LED Digit height 14mm Alarms model 312 Relay type 2 solid state relays Relay ratings 250 VAC 150 mA resistive load Alarm reset Automatic or manual with front panel key Alarm mode High or low level one alarm per relay Normally closed Selectable Hysteresis Selectable 0 100 Connectors 1 5 mm Note Both relays can t operate simultaneously EMC Immunity EN 61326 industrial Emissions EN 61326 class B Dimensions and weight 100 57 100 Weight 200 g 12
11. nector blocks are detachable Alm1 Alm2 Thermocouples 112 13 4156 He A mA input G i nput 0 4 20 mA 24VDC 0 5 10V Power supply Com 0 4 20 mA Jumpers There are no user configurable jumpers Configuration Using the front panel keys This device can be fully configured using the front panel keys Using the keys is described in chapter The device can be cleaned externally with a soft cloth and soap water Cleaning with a small amount of isopropyl alcohol is also allowed User interface The settings are explained in chapter Configuration menu With a configuration software Using a configuration cable POL RS232 or DCS772 and an adapter POL 3PIN Nokeval Mekuwin configuration software can be used for convenient configuration This is especially useful when configuring large number of devices as the settings may be saved to a file and then retrieved The settings are explained in chapter Configuration menu There is a pin header marked as POL on the circuit board Connect the adapter cable to this Start the software and select 9600 baud and the appropriate COM port Use address 0 or 126 Operation A D alae amp Custom converter lineariz Display scaling Sensor Alarms The input signal or sensor is measured with an analog to digital converter and other circuitry A new reading is obtained 3 to 4 times per second The input circuitry is galvanically isolat
12. pressing the key for one second Operator menu The alarm levels and the minimum maximum memory can be accessed without entering the configuration state Use the P key to select function Alarm level 1 Alarm level 2 Minimum Maximum Normal the blinking indicator LEDs indicate the current function Normal Normal state Alarm level 1 Alarm level 2 Minimum Maximum Tare Reset hold Reset hold Reset Reset A Conf AY Edit level AY Edit level When an alarm LED is blinking the alarm level can be changed Press A or V until the first digit starts blinking then edit as described in chapter Editing When an alarm A1 or A2 or minimum M1 or maximum M2 LED is blinking the associated alarm hold or minimum maximum memory can be reset by pressing for one second If a password has been set Alcode in configuration menu the alarm levels can t be changed nor functions reset without entering the correct password Configuration state oe Press A and simultaneously for two seconds to enter the configuration state When entered the Conf LED will Ate light If a configuration password is set you will need to enter it now Cod 0 displayed In case the password is not Y save e known switch the power off hold and keys pressed and switch the power on again E lt Undo The first item of the main level of the configuration menu is shown In Move within the menu using A YV keys Enter a submenu
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