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1. Pin Type Signal Name 1 GND 2 GND 3 GND 4 IN N 5 IN IN 3 6 IN IN 2 7 IN IN 3 8 IN IN 4 9 OUT CAL CONF 10 OUT OUT 6 11 GND 12 GND 13 GND 14 OUT DET_ERROR 15 OUT LEAK_OUT 16 OUT DET_ON 17 OUT DET SIGNAL 18 OUT DET_WAIT 19 OUT OUT 0 20 OUT OUT 1 21 OUT OUT 2 22 OUT OUT 3 23 OUT OUT 4 24 OUT OUT 5 25 OUT 24 VDC OUT 14 4 General 47 Panel Mount Model General Power Input Connector 2 pin Phoenix MC1 5 3 81 Series Detachable screw terminal Power Supply Voltage 19 30 VDC Power Supply Current 3 A max Overall Dimensions 275 x 140 x 75 mm Net Weight 2 2 kg Environment Temperature 0 50 C Humidity 10 90 RH Protection IEC529 IP64 front IP32 back Printer port Connector 9pol D sub male Standard RS232 Inputs Connector 10 pin Phoenix MC1 5 3 81 Series Detachable screw terminal Minimum pulse length 40 ms Input Impedance 50 kohm Input Maximum Range 34 to 38 VDC Input HI gt 12 0 VDC Input LO lt 8 0 VDC Outputs Connector 10 pin Phoenix MC1 5 3 81 Series Detachable screw terminal Output Current max 0 5A output max 2 5 A total Inductive Loads External clamp diodes recommended HI State Voltage Drop lt 2 5V from Supply Voltage at max current LO State Voltage Max 1 5 VDC LO State Leakage Current Max 100 uA Short Circuit Protectio
2. 1 Eeit al e RI 32 10 2 Kent oS E A arent E R AS 33 10 3 Service Mode Display AAA 35 10 4 Service Mode I O Control 37 11 El UI EI 38 11 1 Connector Pin Configuration s nsuesesrsrsresrsresrsrsrssrsrsrsrnsns en sr sr sr skenar An Ra RAR Ra RAR An an ann 38 11 2 Selectable Printer Types A 39 12 Probe Control Pon EE 42 13 Ee Ee 43 14 Specificatons ee Ee eg 44 14 1 SNE Ui E 44 14 2 Table Top Model General AEN 45 14 3 Table Top Model Probe Control Port Connector s sssssresesressrosesrosrnsrsrsrssrn ss nens nn rna 46 14 4 Panel Mount Model General 47 14 5 Panel Mount Model Connectors AAA 48 14 6 Battery operated model Genera 49 1 Scope of this manual This manual covers three different instruments in the H2000 PLUS series of hydrogen leak detectors Hydrogen Leak Detector H2000 PLUS Table top model Hydrogen Leak Detector H2000 P PLUS Panel mount model Hydrogen Leak Detector H2000 C PLUS Battery operated model The H2000 PLUS and H2000 P PLUS models differ only in appearance and supply voltage The Battery operated model H2000 C PLUS does not have the Active Probe Control APC system The Active Probe Control and Installing APC Drivers sections do therefore not apply to the H2000 C PLUS model See the respective specification for further details on differences between model 2 Principle of Operation The H2000 PLUS detector is based on microelectronic sensor technology known as MIS FET technology The
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4. Leak Alarm Level will give fastest possible cycle times for those probes Quick purging also enhances signal repeatability NOTE Purge level interrupts active sampling of APC probes This means that higher signals will be underestimated as the sensor is purged before full signal has developed See also under Printer Port Threshold for leak alarm N B The frequency of the acoustic signal in Analysis Mode is controlled by the Leak Alarm Level A signal equal to the Leak Alarm Level will always give the same audio frequency irrespective of the actual signal strength Signal values in Analysis Mode will never be presented shorter than this time Values are however always presented until signal has recovered Language used in the menu system The detector will look for maximum signal from calibration source during this time This is also the timeout of the Calibration line in an APC program Value of calibration reference N B Calibration Coefficient must be given in same unit as Leak Rate Unit See User Manual for further explanation The Leak Rate Unit is a text string with a maximum of 12 characters It is not involved in any calculations Make sure that you are using same unit for as for your calibration reference see Calibration Coefficient The following characters can be used Upper and lower case English letters the numbers 0 to 9 A A O a a 6 and Space is not supported The string will be trun
5. OUT 2 LO FOLLOW IF OUT 3 HI FOLLOW IF OUT 3 LO FOLLOW IF OUT 4 HI FOLLOW IF OUT 4 LO FOLLOW IF OUT 5 HI FOLLOW IF OUT 5 LO FOLLOW IF OUT 6 HI FOLLOW IF OUT 6 LO FOLLOW IF CAL CONF HI FOLLOW IF CAL CONF LO FOLLOW IF DET WAIT HI FOLLOW IF DET WAIT LO FOLLOW IF DET ON HI FOLLOW IF DET ON LO FOLLOW IF DET ERROR H FOLLOW IF DET ERROR LO The LEAK OUT output can be set actively by the APC program The LEAK OUT will follow the internal leak alarm if no such line exists in the program See further under OUTPUTS below 7 1 3 PRIORITY The PRIORITY index decides if the line may terminate a line currently executing e Aline with higher PRIORITY will immediately terminate the line currently executing e A line with lower PRIORITY will start executing when all lines with higher priority have been executed e Lines with same PRIORITY index will be executed in order of their position in the program list starting from the top The PRIORITY index is also used to control if a progress bar should be shown on the screen during execution of the line For example for a 10 second timeout such a bar will grow from left to right on the screen during 10 seconds e Aline with even PRIORITY will not be indicated by a progress bar e Aline with odd PRIORITY will be indicated by a progress bar NOTE The adjustable times A to D can also be assigned descriptive names that will be presented above the progress bar during execution of a line using the res
6. Port 25 pin D type on the back of the instrument is not a computer or printer port Connecting a printer or any other computer device may cause permanent damage to the connected device Pin configuration for the different detector models is described under Model Specific Specifications below Electrical specifications can be found under Model Specific Specifications below and further information on how to use the port for active probe and test fixture control can be found in the Active Probe Control section Signal patterns for the status signals can be found under Status Signal Patterns below 43 13Status Signal Patterns The timing of the status signals in relation to different events is described by the following two examples Input signals issued to control the APC system should have a pulse length of at least 40 ms Output signals switch with a cycle time of 20 ms 0 02 s This is the cycle time of the APC system 13 1 1 After Power On Power off Power on Warming up Detection or analysis Mode No gas detected DET_ERROR DET_ON DET_WAIT DET_SIGNAL LEAK_OUT 13 1 2 when Detecting a Gas Signal Gas signal Purge Level Leak Alarm Level Detector Signal Level 0 PPM DET SIGNAL LEAK OUT PURGE_LEVEL Trigger APC 44 14Specifications 14 1 Sensitivity Gas sensitivity is the same for all model
7. Screen Save Timeout 1 60 min 20 min Sensitivity 1 13 5 Auto Range ON OFF OFF Direct sensitivity adjustment ON OFF ON Lowest Frequency 0 10 Hz 1 Hz Dead Band 0 14 0 Probe Type Hand Probe H50 Hand Probe H50 1 installable APC Driver APC Time A 0 0 6000 0 s 10 0s APC Time B 0 0 6000 0 s Os APC Time C 0 0 6000 0 s Os APC Time D 0 0 6000 0 s Os Measure Button ON OFF OFF Purge Level Leak Alarm Level 1 00E37 1 00E 02 100 Leak Alarm Level 1 00E 37 1 00E37 1 00E 01 10 Min Presentation Time 120s 1s Language Several choices English Calibration Time Min Calibration Time 30s 10s Calibration Coefficient 1 00E 37 1 00E37 1 00E 00 1 Leak Rate Unit Max 12 characters PPM Password Max 12 characters No password Password protected calibration ON OFF OFF Clock hh mm ss Date YY MM DD Printer Type b Ge No Printer Analysis data output Detection data output Detector Signal Level 0 100 20 Yo Min Calibration Time 0 30s 5s The Hand Probe H50 driver handles all passive hand probes l e probes not requiring any specific I O control such as valves etc 5 Calibration 5 1 General Calibration is a natural part of leak measurement and an important factor in Quality Assurance Calibration is easily done using the internal calibration function Before explaining the details of the calibration procedure we must however point out some facts T
8. and not in high vacuum This makes chamber design very much easier than for a high vacuum chamber There are however three important factors to consider when designing an atmospheric pressure test chamber e The dead volume in the chamber directly influences the sensitivity and eventually the cycle time e Sample transport from chamber to sensor easily adds seconds to the test time e Leaks of equal size at different positions in the chamber can give considerably different signals if adequate mixing is not achieved 6 1 Dead volume of chamber When measuring the total leak rate of an object by enclosing it into a chamber the concentration of hydrogen will increase linearly with time The rate of increase will depend on the leak flow and the volume in which the leak flow is mixed with ambient air The bigger the dead volume the slower the concentration will grow The dead volume should therefore normally be kept as small as possible so that the accumulation time and thereby the total cycle time can be kept short In all but very small chambers it is necessary to provide forced circulation to mix the leaking gas evenly in the dead volume before taking a sample See further under Locating of sample inlet below 6 2 Sampling hose and filter Sampling is normally done through a sampling hose carrying the gas sample from the test point or chamber to the sampler This hose should be kept as short and narrow as possible to minimise cycle
9. be repeated CALIB_FAIL is reset LO when execution of this line starts A program setting the CALIBRATE flag must include exactly one line starting with the CALIB_FAIL trigger Execution starts when execution of previous line ends FOLLOW is used to create program sequences FOLLOW can not be used after WARM_UP or after a line setting either of the CALIBRATION and MEASURE flags Conditional FOLLOW triggers Execution starts when execution of previous line ends IF specified basic TRIGGER is TRUE A sequence will terminate if one FOLLOW_IF trigger in the sequence is FALSE FOLLOW_IF triggers are used to create program sequences FOLLOW_IF triggers can not be used after WARM_UP or after a line setting either of the CALIBRATION and MEASURE flags All FOLLOW_IF triggers are listed below FOLLOW IF IN 0 HI FOLLOW IF IN 0 LO FOLLOW IF IN 1 HI FOLLOW IF IN 1 LO FOLLOW IF IN 2 HI FOLLOW IF IN 2 LO FOLLOW IF IN 3 HI FOLLOW IF IN 3 LO FOLLOW IF IN 4 HI FOLLOW IF IN 4 LO FOLLOW IF LEAK ALARM HI TRUE if signal is above leak alarm level FOLLOW IF LEAK ALARM LO TRUE if signal is below leak alarm level FOLLOW IF LEAK OUT HI TRUE if LEAK OUTis set HI FOLLOW IF LEAK OUT LO TRUE if LEAK OUT is set LO FOLLOW IF DET SIGNAL H FOLLOW IF DET SIGNAL LO FOLLOW IF PURGE LEVEL HI FOLLOW IF PURGE LEVEL LO FOLLOW IF SENSOR ERROR FOLLOW IF OUT 0 HI FOLLOW IF OUT 0 LO FOLLOW IF OUT 1 HI FOLLOW IF OUT 1 LO FOLLOW IF OUT 2 HI FOLLOW IF
10. connect the fresh air intake Lines 0 and 1 form the stand by loop This loop resets the test result outputs OUT_6 and LEAK_OUT after 30 seconds timeout 300 on line 0 Lines O and 1 have the lowest possible priority so that they only execute if no other trigger is HI Lines 2 3 and 4 form the Measurement trigger routine Line 2 is a delay intended for accumulation type sampling Accumulation is used e g when performing an integral test on a test object to allow a sufficient amount of gas to accumulate under a test hood The accumulation time is set by APC Time D This is set to 0 s as default i e line 2 is skipped Line 3 performs pre test purging of the sample hose The pre test purge time is set by APC Time B Line 4 calls the measurement routine by setting the MEASURE flag Sampling time is set by APC Time A The priorities of lines 3 and 4 are set low so that errors and other running routines inhibit measurement trigging The priorities of lines 3 and 4 are all odd numbers This makes the H2000 PLUS display a progress bar and the specific timer name for the adjustable timeouts A to C NOTE If external sample time control is desired you can set APC Time A to 1 and control the sample time by holding the sample trig input IN 0 HI for the desired sample period Remember however that the accumulation and pre test purging times controlled APC Times D and A then will be a part of the sampling time Sampling starts when line 3 times o
11. continuously dump debugging data on the printer port IMPORTANT Setting the detector in debug mode will inhibit normal use of the printer port If in debug mode the display will show a number on the right side If you have accidentally entered the debug mode you can exit by choosing the Debug Mode menu option again 35 10 3 Service Mode Display When in service mode the display will show a service info screen as shown below Left part of the screen shows APC program status and gas signal data The right part shows the current status of inputs outputs and some internal flags This screen is very handy when debugging APC programs since you can follow how the program runs and directly see how inputs outputs and flags change Service Mode Program 0 3 58 Detect 5 132498 Signal 0 0e 00 DSP Out 0 00 00 000 00000 00 ADC V 1 861459 000 0000000 0 00100 Toggle lt OUTO gt Menu Program 0 3 5s Means APC Program has been executing line 0 for 3 5 seconds Detect 5 132498 Numeric value of the Detection Mode signal Signal 0 0e 00 Direct sensor signal value Can be used to analyse sensor condition DSP Out 0 00 Numeric value of the Analysis Mode signal before Leak Rate Unite conversion ADC V 1 861459 Sensor output voltage First line of binary digits Group 1 Digit 1 Meas Per END Goes HI when the flag Measure goes LO Goes LO again when either of the triggers MEAS LEAK or MEAS NO LEAK is polled Digit
12. detector signal or by the APC program If the LEAK OUT output is not set H or toggled T in the APC program it will follow the signal of the detector In that case it will go HI when signal goes above leak alarm level and go LO when signal recovers again If you want LEAK OUT to directly follow the signal you must make sure that all lines in your program set the LEAK OUT tag low L or unchanged 0 CAL CONF Driving transistor output CAL CONF tells the supervising system that the detector has been successfully calibrated CAL CONF is set by the APC program CAL CONF should be set HI if last calibration was successful It is recommended that CAL_CONF is set LO by the line or sequence that sets the CALIBRATE flag starts calibration NOTE As all other controllable outputs CAL_CONF is set LO on power up It is good practice too perform calibration after power up The detector can be used when CAL_CONMF is LO but calibration may be incorrect See example for Sample Probe H28 NOTE We strongly recommend that CAL_CONF output is used for calibration control Electrically it is however not different from the other outputs OUT_0 to OUT_6 It is therefore possible to use CAL_CONF as an extra general output in applications where there is less need for automatic control of calibration status 21 7 1 5 2 Non controllable outputs NOTE This section is for reference only There are 4 driving external outputs that can not be contro
13. for acknowledgement of the leak If you wish the LEAK_OUT to go low upon leak acknowledgement you can change the LEAK_OUT tag on line 21 to L instead of 0 NOTE The top priority lines 17 and 18 will not release line 9 since they will only trig after a calibration The measurement or calibration routines can not be trigged when program is stopped at line 9 since lines 2 and 6 have lower priority 29 7 5 Installing APC drivers APC drivers are installed in the detector from a PC All active probes need a driver to be installed before they can be used N B The Tracer Gas Filler TGF10 is does not need a separate driver as the TGF driver is already included in the different probe drivers including the H50 driver that is permanently installed in the detector NOTE Battery operated model H2000 C PLUS does not incorporate the APC feature Customised APC drivers edited and compiled on a Windows computer are installed in the same way For driver installation you will need the following 1 APC Driver software Delivered with the probe 2 File transfer cable Delivered with the probe 3 PC computer with Windows95 or later Follow the instructions below carefully 1 Check if driver is already installed i Switch the detector ON wait until start up sequence has terminated ii Enter the APC Settings menu iii Enter the Probe Type sub menu iv If driver is installed you will find the correct driver name in
14. gas concentration is defined by the Calibration Coefficient The following characters can be used Upper and lower case Roman letters the numbers 0 to 9 U U A A O a a 6 and dash Space is not supported The string will be truncated after the first space found You can use any unit you like as long as it contains a maximum of 12 characters for example sccm mm3 s oz yr g a R134a etc The unit can also be a concentration for example PPM or mg ml H2 etc Note that space is not supported The leak rate unit string will be truncated at the first space found See also under Adjustable parameters above N B It is strongly recommended that the Leak Rate Unit is set to that used on your calibration reference l e the unit used in the calibration certificate of your reference leak or reference gas If you use another Leak Rate Unit you must also recalculate the calibration value of your reference in that same unit 5 2 2 Calibration time The calibration time decides how long time the detector shall look for a reference signal before giving up If the calibration is set to e g 6 seconds the detector will record the maximum signal during 6 seconds after that the operator or external hardware orders a calibration It is very important that all delays in gas exposure as well as reaction time of sensor are taken into consideration when setting the calibration time Calibration will not be correct if
15. isn t affected if an output is set high For example the APC instruction FOLLOW IF OUT 0 HI only works if OUT 1 is set internally by the program When H2000 PLUS is turned off all overrides will be lost and the 1 O are reset to normal state 38 11Printer Port The detector is equipped with a standard serial printer port The port can be set up for the following printer types Alfapanel Alfapanel Compact PC Printer and Data Dump This is done in the APC Settings menu The intended use for the different options and the specific functions are described below Important The 25 pin D type connector on the back of the instrument is not a computer or printer port Connecting a printer or any other computer device may cause permanent damage to the connected device Always switch power off before disconnecting or connecting any cable 11 1 Connector Pin Configuration The printer output connector is a standard 9 pin male D sub The connecting cable is a standard 9 pin file transfer cable Null Modem Cable Pin configuration Pin Signal Signal name 1 DCD Not used 2 RD Received data 3 TD Transmitted data 4 DTR Not used 5 SG Signal ground 6 DSR Not used 7 RTS Not used 8 CTS Not used 9 CE Not used 39 11 2 Selectable Printer Types 11 2 1 No Printer Printer output disabled Incoming communication is enabled H2000 PLUS listens for incom
16. sensor is a field effect transistor in an integrated circuit The gate electrode of the transistor is made of a hydrogen absorbing metal alloy metal hydride When this device is exposed to hydrogen the gas molecules adsorb on its surface dissociate into hydrogen ions protons and diffuse rapidly into the gate metal The absorption of hydrogen ions affects the work function surface potential of the metal which gives the same effect as if the gate voltage of the transistor was changed Only hydrogen ions can diffuse into the metal This excludes cross sensitivity from substances that does not contain hydrogen Also the dissociation of hydrogen from other molecules is very inefficient a fact that makes these sensors practically insensitive to other substances The only relatively common substance being detected is H2S hydrogen sulphide This gas is however extremely toxic and has a very strong and distinct smell It is therefore never present in interfering concentrations in normal working environments The electrical output signal from such sensors are not at all as stable and repeatable as for example sensors for physical parameters such as temperature pressure etc Therefore the output signal must undergo signal interpretation in order to give reliable measurements This is done by a microprocessor in the instrument which also controls the sensor temperature with high accuracy and other sensor diagnostics in order to ensure functional
17. the measurement result interpreter and post test purging routine The measurement routine will set either MEAS NO LEAK or MEAS_LEAK depending on the result of the measurement Lines 9 or 12 will be executed accordingly when line 4 times out or is interrupted by another line Lines 9 to 14 have higher priority than the calibration and measure routine sequences lines 6 and 2 The probe error line 15 has a higher priority and can interrupt lines 9 to 14 See further under comments to line 12 Lines 10 and 13 set the appropriate result output LEAK_OUT for REJECT and OUT_6 for ACCEPT of test object and then performs post test purging of the sampling hose This purging time is controlled by the adjustable timeout C APC Time C The post test purging is only performed if the REJECT output is LO when reaching the respective line The reason for this is that a signal above the Purge Level will set the REJECT flag and purge the probe and normal post test purging will therefore not be needed in that case Line 15 checks the Sample Unit s sniffer flow alarm switch The switch is connected to IN 2 and is HI if sniff flow is correct IN 2 goes LO if sniff flow is blocked Line 15 will then set the PROBE_ERROR flag the REJECT output and reset the ACCEPT output The program will halt at line 15 until the flow is OK again IN_2 goes HI again Line 15 has a high priority to ensure that a sniff flow error will terminate a measurement and reject the test o
18. time Sensistor s samplers incorporate built in sample inlet filters These do however have limited capacity and must be cleaned or replaced at rather short intervals if there are high levels of dust and other particles in the samples An external filter is fitted in the sample hose will greatly prolong the service intervals This is at the cost of prolonged sampling time however Generally we recommend a sample hose with inner diameter within the range of 1 2 mm 2492 6 3 Location of sampling inlet When designing the test chamber it is essential that the sample inlet is placed in a correct position relative to reference inlet circulation fans etc The following issues should always be considered The geometry of the test object and the chamber should be considered when designing the circulation device In a more open geometry it is often enough to place a small electric fan inside the chamber In many cases you will however need to design a circulation bypass fitted with a pump or duct fan The inlet and outlet of the circulation bypass should be placed at opposite ends of the chamber so that leaking gas from all points of the object will be caught in the main flow and mixed evenly with the chamber air Remember that the internal volume of the circulation bypass adds to dead volume of the chamber Even if the circulation is ever so well designed a small leak located in a retracted part of the object often gives an unexpectedly lo
19. wait until the RS232 transmitter unit has sent the data appr 20 ms and then send the data e g 1 00E 01 Data string must be ended with a carrige return character chr13 dec It is necessary to have a short pause gt 20 ms between the header and the data Example C wait 20 ms PPM Carriage Return chr 13 This sets Leak Rate Unit to PPM Parameters can be sent in any order you like e f your data was received and correct H2000 PLUS immediately echoes sends back the data e f you send a non existing header you will not receive anything e If the data couldn t be converted in the H2000 PLUS you will receive the string CoEr Conversion Error N B Remember to use capitals for the header 31 9 H2000 PLUS commands The most commonly used H2000 PLUS functions can be started configured over the RS232 interface H2000 PLUS Command Header Calibrate Measure Print Request Printer Analysis Data Output Stop Measurment Hand Probe H50 Active Probe Installed AP Analysis Mode Detection Mode NX ODOVZAERA Calibration Request Starts calibration if the H2000 PLUS has an active probe driver installed H2000 PLUS answers with a K if an active driver containing a calibration routine was found and F if the calibration APC sequence not found Calibration doesn t start if Purge level is reached Measure Request The active test cycle defined by the APC driver starts M i
20. 2 Meas Per HI Goes HI if leak is detected during APC Measurement period Goes LO again when either of the triggers MEAS_LEAK or MEAS NO LEAK is polled Group 2 Digit 3 DET SIGNAL HI when signal is above Detector Signal Level Digit 4 LEAK_ALARM HI when signal is above Leak Alarm Level Digit 5 PURGE LEVEL HI when signal is above Purge Level Group 3 Digit 6 IN A Status of external input 4 Digit 7 IN 3 Status of external input 3 Digit 8 IN 2 Status of external input 2 Digit 9 IN_1 Status of external input 1 Digit 10 IN 0 Status of external input 0 Group 4 Digit 11 TEMP LO HI if sensor temperature is too low Digit 12 TEMP_HI HI if sensor temperature is too high 36 Second line of binary digits Group 1 Digit 1 Digit 2 Digit 3 MEASURE HI when APC measurement routine is running i e APC line setting MEASURE flag is executing PROBE ERROR HI when Probe Error flag is set CALIBRATE HI when APC calibration routine is running Calibration screen will be shown Group 2 Digit 4 Digit 5 Digit 6 Digit 7 Digit 8 Digit 9 Digit 10 OUT 6 Status of external output6 OUT_5 Status of external output 5 OUT_4 Status of external output 4 OUT_3 Status of external output 3 OUT_2 Status of external output 2 OUT_1 Status of external output 1 OUT 0 Status of external output 0 Group 3 Digit 11 CAL_CONF Status of external ou
21. IN 3 LO IN 4 H IN 4 LO LEAK ALARM H LEAK ALARM LO DET SIGNAL HI DET SIGNAL LO PURGE LEVEL HI PURGE LEVEL LO SENSOR ERROR MEAS LEAK MEAS NO LEAK CALIB PASS CALIB FAIL FOLLOW FOLLOW IF 16 TRUE if IN 3 input is HI TRUE if IN 3 input is LO TRUE if IN 4 input is HI TRUE if IN 4 input is LO TRUE when sensor signal is above Leak Alarm Level TRUE when sensor signal is below Leak Alarm Level TRUE when sensor signal is above Detector Signal Level TRUE when sensor signal is below Detector Signal Level TRUE if sensor signal is above Purge Level TRUE if sensor signal is below Purge Level TRUE if sensor or sensor cable is defective TRUE if sensor signal was above Leak Alarm Level anytime during last measurment MEAS PER MEAS_LEAK is reset LO when execution of this line starts A program setting the MEASURE flag must include exactly one line starting with the MEAS_LEAK trigger TRUE if sensor signal never was above Leak Alarm Level during last MEAS PER MEAS NO LEAK is reset LO when execution of this line starts A program setting the MEASURE flag must include exactly one line starting with the MEAS NO LEAK trigger TRUE if last calibration was accepted by the detector CALIB_PASS is reset LO when execution of this line starts A program setting the CALIBRATE flag must include exactly one line starting with the CALIB_PASS trigger TRUE if last calibration was rejected and calibration needs to
22. PLUS V4 0 Hydrogen Leak Detector H2000 PLus H2000 C PLus H2000 P PLus E Sensistor Technologies DU A gt D O sl lt oi gt C oi Contents L Scope ofthis manual ass vast tesnsnerssdonsdases dant atte see ave ee ve SANN NN oi daw Manan 1 2 Principle of Operations niivives adie NERON SANNA ANN eege 1 CMN te EE 1 A Adjustable Paramete Sesar aaa ai a SOA RNA TRAAN a AN KE RNA YE KANE 3 4 1 Engineenng Fort edu dei ANNAN ies de dna i eared aides 3 4 2 Description of Parameters ENEE 3 4 3 Range and Default Settings of all Parameters AAA 6 5a ee ET 7 SE WEE BEEN 7 5 2 Setting up calibration parameters m mmsssssresesrssrsrssosroresrsrssnsrs en snar snar sr sn sr RAR Kn an sn bn an ora H 5 3 Password protected Calibration AAA 10 5 4 Sensor condition indicator Au 10 55 gt Galilbration MESSAGES EE 11 6 Active Probe Sampling WEE 12 6 1 Dead volume Of chamber AANEREN 12 6 2 Sampling hose and BE 12 6 3 Location of sampling inlet 0 AE 13 7 Active Probe Control sar sior sensor anat ease AE EE EE ated 14 TA APG tele TEE EE 14 KO Programming ell LCE 23 7 3 APC Program Example 1 25 7 4 APC Program Example 2 28 Zb Installing APC driverg ANEN 29 8 Downloading parameters to H2000 DUU 30 8 1 Settings of the RS232 serial Communication 30 8 2 Supported Parameters AAA 30 8 3 Transfer Of parameters ANE 30 9 H2000 PLUS commands AA 31 10 Reyer Vero 1 816 EE 32 10
23. al above Alarm Level is detected or e g H50 and AP57 when the print button is pressed Activate under Measure Button menu Active probes Data is printed at end of measurement sequence e g AP29 Printing of the current value can also be requested by an RS232 command see under H2000 PLUS commands or ordered manually by pressing PRINT see Operators Manual A custom APC program setting the MEAS flag prints as AP55 AP29 and an APC program not using MEAS flag prints as H50 41 11 2 5 Detection Data Output The Detection Data Output option is intended for automated scanning of weld seams etc IMPORTANT The Detection Data is expressed in arbitrary units Detection Mode signal is not affected by calibration 11 2 5 1 Communication Specifications Data Rate 9600 baud Data bits 8 Stop bits 1 Parity None Flow Control None Data Format for Detection Data Output 10 ASCII characters 9 characters showing value in engineering format see under Engineering Format 1 linefeed LF character Print time 50Hz continuous streaming data N B Data rate is 25Hz when H2000 PLUS is running in Service Display Mode 42 12Probe Control Port NOTE Battery operated model H2000 C PLUS does not have a Probe Control Port The Probe Control Port can be used for controlling active probes feeding status signals to a supervising computer system and for simple test fixture control Important The Probe Control
24. ared Conditions interrupting a sequence can be a higher priority line or a FALSE FOLLOW_IF trigger Lines setting any of the CALIBRATE or MEASURE flags can only be the last line in a sequence Follow lines after such a line will never execute Unconditional purging or other actions needed after a calibration or measurement must therefore be controlled by a separate line or sequence A suitable place for this is in sequence with the CALIBRATE_PASS FAIL or MEAS _LEAK NO_LEAK lines that set outputs to signal calibration and measurement results See example 1a below 7 2 5 Loops A loop is a sequence that restarts by itself and is repeated until terminated by a higher priority trigger goes TRUE Only one loop should normally be defined in an APC program The loop should start with the STAND BY trigger and include one or more FOLLOW FOLLOW_IF triggers Additional loops can be achieved by using an output as a flag restarting the loop IMPORTANT The last line of a loop started by the status of an output must have lower priority than the first line of the loop sequence The loop will otherwise stop at the last line waiting for the starting trigger to go false sequence timeout override Choosing the right priorities is the key to make single and multiple loops work properly 7 2 6 Calibration Controlling calibration from an external device often involves one or several preparation steps Make these in a sequence and let the last line in the
25. ast level of display Higher value gives higher contrast The contrast may need adjustment if ambient temperature changes Brightness of display lamp Display lamp will dim to half brightness if instrument is left idle for the number of minutes set by this parameter The display lamp will return to the set brightness if any of the display buttons is pressed and if a gas signal is detected Sensitivity of audio signal and signal bar in Detection Mode NOTE This does not affect the Analysis Mode Set this parameter to ON for auto ranging of sensitivity in Detection Mode Sensitivity will decrease two steps if signal reaches full scale Sensitivity is restored to selected Sensitivity see above when signal returns to zero Setting this parameter to OFF will remove the sensitivity adjustment from the Detection Mode display Sensitivity can still be adjusted in the Sensitivity Settings menu after giving password if set NOTE The sensitivity setting only affects the Detection Mode Frequency of audio signal when not detecting gas The Dead Band function can be used to mask low signals This can be handy if working with high sensitivities and noisy signal Increasing the Dead Band will raise the threshold at which signals will affect the sound and signal bar NOTE Dead Band applies only to Detection Mode Dead Band will be automatically reset to zero if sensitivity is changed Select the connected probe Chose betw
26. bject whose status is unclear Line 16 is executed if signal goes above DET_SIGNAL level during stand by This will inhibit starting of calibration routine who has lower priority Lines 17 and 18 form the calibration result interpreter Directly after a calibration either of the lines 17 or 18 will execute depending on the result of the calibration Line 17 will set the CALIB_CONF output if calibration passed and was saved Line 18 will reset the same output if calibration failed Lines like 17 and 18 must be included to read and thereby reset the CALIB_FAIL and CALIB_PASS triggers See also explanation of these triggers in the TRIGGER section above Line 19 is trigged if the system detects a sensor error This line has priority over calibration and measurement routines It will set the REJECT output LEAK OUT The H28 valves are set in STAND BY mode Line 20 defines input IN_3 as an external manual sample hose purge trigger Setting IN_3 HI will set the H28 in purging mode This should be used if you prefer to control purging from an external device If so you can set APC Time B and C pre and post test purging times to zero and control purging solely via the IN_3 input 28 7 4 APC Program Example 2 You can add forced acknowledgement of leaks to example 1 by changing line 9 and adding line 21 as shown below Changes are shown in bold italics If a leak is found it must be acknowledged by a HI signal on IN 4 before testin
27. cated after the first space found Text string max 12 alphanumerical characters used to lock critical parameters Setting password to an empty string no characters means that no password is needed to modify the critical parameters The default is no password If this parameter is set to ON you will be prompted for password when Calibration Clock Date Printer Type Detector Signal Level Min Calibration Time starting a calibration Setting Password Protected Calibration to ON has no effect is no password is set APC controlled calibration can be started from the bus in both cases Real time set as hh mm ss Hours and minutes can be adjusted Seconds will automatically be set to 00 when hours and minutes have been set Clock runs even when detector is disconnected from the mains Real Time Clock date set as YY MM DD Example 00 12 31 Clock runs even when detector is disconnected from the mains See Printer section below Signal level below which the detector is considered to have recovered from previous gas signal Carefully read Service Mode section before changing this parameter This defines the lower limit of the parameter Calibration Time Carefully read Service Mode section before changing this parameter 4 3 Range and Default Settings of all Parameters Parameter Range Default Contrast 0 20 10 Brightness 0 63 63
28. ctions and the menu structure of the H2000 PLUS detector is essential for successful APC programming Some previous experience of software design is also helpful We recommend that you use a Bus Test Box 2000 to test and verify your program The test box is an excellent tool and a great help when developing APC drivers Also use the Service Menu to display the progress of the program line by line It is recommended that you study the examples below in parallel with reading the text 7 1 APC program syntax The editable APC program consists of maximum 32 program lines Each line consists of the elements listed below See further description below the list The elements of a line are separated by commas TRIGGER Line is executed if TRIGGER command is TRUE PRIORITY The PRIORITY index decides if the line can terminate another executing line Priority also decides if a running timer should be indicated by a progress bar on the screen Even priority means no bar odd priority means bar should be displayed FLAGs There are 3 internal FLAGs that can be controlled by the APC program line Status of each FLAG is set according to respective TAG OUTPUTs There are 9 external outputs that can be controlled by the APC program line Status of each output is set according to the respective TAG TIMEOUT Execution of the line terminates when the TIMEOUT has elapsed and the trigger is LO 7 1 1 Line SYNTAX An APC program line is built up as f
29. d with inputs and outputs for controlling external active probes Active probes incorporate pneumatics and electronics for sniffing purging etc This feature is called APC Active Probe Control and works much like an industrial PLC For each standard probe in the H2000 PLUS Leak Detecting System there is a specific software driver This driver makes the APC system control the probe in the correct way The software driver will be delivered with the active probe To install the driver simply start the installer program and follow the instructions given See also under Installing APC drivers The driver for the H50 Hand Probe is built in to the detector The driver for any other probe as well as custom made APC drivers programs are installed as the second choice in the Probe Type menu A custom driver is an APC program made for a customer specific purpose such as e g special samplers or to control simple test fixtures This section of the manual describes the programming syntax of the APC system Each line in an APC program controls the status of the outputs and internal flags according to specified conditions Single line commands sequences and loops can be programmed so that a large variety of tasks can be performed The custom APC program is written on a Windows computer and compiled by the APC Compiler software The compiled APC program is downloaded to the H2000 PLUS via a standard serial 9 pin RS232 cable Understanding the basic fun
30. een Hand Probe H50 and one more probe driver installed from disk delivered with active probe if ordered APC Time A APC Time B APC Time C APC Time D Measure Button Purge Level Leak Alarm Level Min Presentation Time Language Calibration Time Calibration Coefficient Leak Rate Unit Password Password Protected 4 Adjustable timer used by the APC system Select APC Time A and press Enter to display specific use of Time A APC Timer A can be used for general purposes in a custom APC program Adjustable timer used by the APC system Select APC Time B and press Enter to display specific use of Time B APC Timer B can be used for general purposes in a custom APC program Adjustable timer used by the APC system Select APC Time C and press Enter to display specific use of Time C APC Timer C can be used for general purposes in a custom APC program Adjustable timer used by the APC system Select APC Time D and press Enter to display specific use of Time D APC Timer D can be used for general purposes in a custom APC program Setting this parameter to ON display Measure over the left button Pressing Measure will initiate a sample cycle Signal level controlling the Purge Level APC Triggers Standard probes that support active sampling use the Purge Level for fast interruption of sampling that result in high gas signals Setting Purge Level equal to or just above
31. ement cycle has ended For active measurement routines it may therefore be practical to program the LEAK_ALARM output to be set when detecting a leak and reset at start of next sample Another output can be programmed to Accept indicator in a similar way IMPORTANT The setting of an ACCEPT indicator must be a 100 certain indication of that the tested object was not leaking This means that all events terminating the measurement cycle must set that indicator LO It is in the same way recommended that a REJECT indicator LEAK OUT is set HI by the same events The two result indicators should normally both be reset LO when starting the next measurement sequence It is also recommended that they are reset by a STAND BY loop as seen in Example 1 The reason for this is to avoid confusing an operator coming back after a break not remembering whether the test object on the bench has been tested or just connected Testing again is better than passing a leaking object 7 2 2 Leak acknowledgement If desired you can cause the APC program to halt every time a leak is found so that further testing is not possible until the result is confirmed by an acknowledgement signal from the operator or supervising system This is done by setting TIMEOUTS S on the line or last line in the sequence setting the REJECT output This line sequence starts with the MEAS_LEAK trigger Setting the S timeout will cause the program to halt at this line The prog
32. equal to the Hydrogen concentration in your reference gas This can be found on the certificate of analysis issued for the gas N B Remember to set the Leak Rate Unit to the same unit as that used to express the concentration Set up and calibration 1 Set Leak Rate Unit equal to the desired unit of concentration typically PPM 2 Set the Calibration Coefficient equal to the concentration of hydrogen in the reference gas 3 Enter the Calibration menu and press START 4 If using a hand probe immediately put the probe in a stream of reference gas Remove probe when gas has been detected Automatic probes will perform this step automatically Repeat steps 3 and 4 until calibration is OK 5 Press SAVE Automatic probes will save automatically Example Reference gas contains 10 PPM Hydrogen in synthetic air Set the Calibration Coefficient 10 and Leak Rate Unit PPM NOTE You will need to repeat the calibration typically 2 3 times to get Calibration OK after changing set up or probe Remember to allow at least 30 s between each calibration for best accuracy 5 2 3 2 when measuring Leak Flow When measuring leak flow you should calibrate the detector against a reference leak Also in this case the detector generates a signal which is proportional to the change in hydrogen concentration It then calculates the corresponding leak flow in the selected unit by multiplying the signal with the Calibratio
33. g can continue CAL_CONF LEAK_OUT EN Cl STAND BY FOLLOW H L 0 L H L H H L L H H 0 0 H H L L H H 0 L L L L H 0 L L H FOLLOW FOLLOW PURGE LEVEL HI lNnIolalselhIvl lo line reference FOLLOW MEAS LEAK 10 FOLLOW IF LEAK OUT LO MEAS NO LEAK 13 FOLLOW IF LEAK OUT LO 14 FOLLOW 191 d s gt L 15 0 L 0 0 L 0 0 L L L L 0 L L L L H L L FOLLOW IF DET SIGNAL LO L L L L L L L L DET SIGNAL H CALIB PASS CALIB_FAIL L L L L L L L L H L L L L L L L L L L SENSOR_ERROR L L 0 L 0 L 0 0 L L L L 0 L L L L 0 L L L L 0 L L L L 0 L L L L 0 L 0 L L 0 L L L L L L L L L L L L L L 0 0 L L L L 0 H 12 L L L L 0 0 L H L L 0 L H i L L 0 H L L L 0 L 0 L L 0 L 0 L L H L 0 L L L L L L L L L 0 L L 0 0 0 0 0 0 0 0 0 H L H 0 0 0 0 0 0 H L H 0 0 0 0 0 0 L L L L L L H H L H L H 0 0 0 0 Comments TIMEOUT of line 9 has been set to S to make the program stop at this line until the higher priority leak acknowledgement signal IN_4 is set HI This is defined on line 21 Line 9 has been given a higher priority to prevent that a temporary sensor or probe error would acknowledge the leak by releasing line 9 The 4 outputs controlling the H28 pneumatics have been changed to set the H28 in sample hose purge mode while waiting
34. he H2000 PLUS detector has two measuring modes Analysis and Detection Mode The Analysis Mode is used to quantify leaks and should therefore be calibrated as described below and in the User Manual The Detection Mode is primarily intended for locating leaks The two modes are only affecting the way the signal is presented to the operator In Analysis Mode the detector presents an absolute number signifying the size of the leakage and also a sound whose frequency is proportional to the number shown In Detection Mode the operator will instead hear a sound whose frequency varies continuously with the concentration of hydrogen in the sensor The same signal is also presented as a horizontal bar on the display IMPORTANT The leak alarm is active in both modes and leaks will be correctly evaluated against the leak alarm level also when instrument is in Detection Mode The sensitivity setting of the Detection Mode does not in any way affect the calibration of the instrument It just changes the sensitivity of the audio frequency and the bar in the detection mode Note that Sensistor that certain probes such e g the AP57 are solely intended for locating leaks and that those probes can normally not be calibrated to the same accuracy 5 2 Setting up calibration parameters 5 2 1 Leak Rate Unit The Leak Rate Unit is a text string with a maximum of 12 characters It is not involved in any calculations The relation between the leak rate unit and the
35. he first line of the sequence goes FALSE or until the TIMEOUT of that line has elapsed whoever is longest Le TIMEOUT override only works for the last line in a sequence and it is the trigger of the first line that controls the TIMEOUT override 22 IMPORTANT Timeout override in a sequence only works if the last line has higher priority than the first line of the sequence Lower priority should be used in a LOOP See LOOP under General Hints Below 7 1 6 2 Adjustable Timeouts Instead of typing an integer to define the TIMEOUT of a line you can use one of the four adjustable TIMEOUTSs These four timers can be adjusted from the display of the H2000 PLUS detector Typing A B C or D instead of a TIMEOUT value will cause the APC program to load the TIMEOUT value from the display memory Adjustable TIMEOUTs can be set in the range 0 to 6000 0 s with 0 1 s resolution Important Setting an adjustable TIMEOUT to zero means line will be skipped Consider this when writing you driver Program lines using adjustable timeouts will be skipped if the time is set to zero No necessary output changes must therefore be ordered on such a line The adjustable TIMEOUTs are located under the APC Settings menu under the following names A APC Time A B APC Time B C APC Time C D APC Time D The adjustable timers can be given specific and descriptive names The names are defined in the APC program file and should not be
36. ibration time Example Calibration is made by sniffing on a very low flow reference leak The sniffer flow will carry the hydrogen to the sensor in 1 5 seconds Sniffer flow alarm will go off if the flow decreases by 25 This means that gas transport could take up to 2 s In this example the sensor will reach its maximum signal 3 s after that the gas reaches the sensor This gives a total of 5 seconds Allowing for some margin it is recommended to set Min Calibration Time to 6 s in this example Setting Min Calibration Time too low will have the following effects e Calibration will fail if Calibration Time is set too low e Calibration might pass but be incorrect Setting a high Min Calibration Time will have the following effects e Calibration takes longer time than necessary e Calibration gas consumption is higher than necessary It is of course possible to set Min Calibration Time to 0 and anyway set the correct Calibration Time from under the General Settings Menu IMPORTANT Correct calibration is an essential parameter in quality testing We therefore recommend that careful consideration is paid to setting an appropriate Min Calibration Time This will inhibit personnel lacking detailed knowledge about calibration from jeopardising quality by setting a to short Calibration Time 10 2 5 Debug Mode Do not enter this mode Debug mode is for the manufacturer s use only Entering debug mode will set the detector to
37. ing data but will not print send test results 11 2 2 PC Printer with serial interface The PC Printer option can be used to print data on most standard PC printer with serial interface Parallel interface printers can be used if connected through a serial to parallel converter see below NOTE The output format has been chosen to be as simple as possible to ensure that most printers will accept it The printer output therefore doesn t use any flow control This means that some printers may delay printing until the input buffer is full or a pre defined timeout has elapsed 11 2 2 1 Communication Specifications Data Rate 1200 baud Data bits 8 Stop bits 1 Parity None Flow Control None IMPORTANT Due to the large variety of printers available on the market Sensistor can take no responsibility for the functionality of a particular type of printer 11 2 3 Printed data The detector can print the following information Date and Time for Power on of detector Time of print Value of all gas signals above than Leak Alarm Level Test result Accept or Reject Value of signal obtained during active test Result of calibration OK or Calibration Not saved Date and Time Parameter settings FA ANA RON Printing of the current value can also be requested by an RS232 command see under H2000 PLUS commands or ordered manually by pressing PRINT see Operators Manual Choice of probe decide
38. ing triggers will be set when calibration routine ends CALIB_PASS goes TRUE if calibration is accepted CALIB_FAIL goes TRUE if calibration is rejected Sequencing is not possible after a line setting the Calibrate flag Follow lines after this line will never execute NOTE The CALIBRATE FLAG is automatically reset LO when calibration routine ends See further under General Hints Calibration When execution of a line starts each of the 3 FLAGs is set reset according to the following TAGs L FLAG is reset LO H FLAGis set Hl NOTE Toggle T and No Change 0 tags can not be used on the internal flags 20 7 1 5 OUTPUTS 7 1 5 1 Controllable outputs There are 9 driving external outputs that can be controlled by APC programs Source and sinking capacity is specified under Specifications When execution of a line starts each of the 11 outputs is set according to the following TAGs OUTPUT is set LO 0 VDC OUTPUT is set HI 24 VDC Status of OUTPUT is toggled HI goes LO LO goes HI 0 _ Status of OUTPUT is left in previous state The controllable outputs are ap SET UH OUT 0 Driving transistor output OUT 1 Driving transistor output OUT 2 Driving transistor output OUT 3 Driving transistor output OUT 4 Driving transistor output OUT 5 Driving transistor output OUT 6 Driving transistor output LEAK OUT Driving transistor output LEAK OUT can either be controlled directly by the
39. ity It also automatically compensates for background gas 3 Installation Important The 25 pin D type connector on the back of the instrument is not a computer or printer port Connecting a printer or any other computer device may cause permanent damage to the connected device Always switch power off before disconnecting or connecting any cable Installation and set up of table top model when using passive probes e g Hand Probe H50 is described in the User Manual For connection of other probes please refer to respective probe manual 2D The panel mount model can be installed in the operator s panel or any other flat surface of your leak tester Mounting brackets and panel rubber seal is delivered with the detector The detector should preferably be mounted on a vertical surface Tilting more than 30 degrees is not recommended Tilting more makes air circulation poor resulting in increased temperature inside detector This will reduce contrast of display and lifetime of lamp and electronic circuits IMPORTANT Verify that ambient temperature is below 50 C Panel cut out DA 26242 mm Free space i vertically gt 330 mm 127 2 mm Free space horisontally 300 mm EE Panel cut out 262 x 127 mm Maximum panel thickness 8 mm Allow an extra 20 mm on left and right side for mounting brackets Leave at least 100mm above and below for air circulation Install the detector as follows 1 Cut hole in pa
40. lled by the APC programs These 4 outputs are controlled by specific signals set by the general software in the H2000 PLUS Even if not controlled by the APC program the status of these outputs can be used as triggers in an APC program DET_ON HI when power of detector is on DET_WAIT HI when detector is warming up first 60 s after power on DET_ERROR HI if instrument sensor or probe error is detected DET_SIGNAL HI when sensor signal is above Detector Signal Level See Service Menu section for details 7 1 6 TIMEOUT 7 1 6 1 Fixed timeout Starting execution of a line will start a timer set by the TIMEOUT value One TIMEOUT unit is 100 ms 0 1 s TIMEOUT is defined as An integer in the range of 1 60000 OR S meaning STOP OR A B C or D The code for one of four adjustable timers See next section Important Setting TIMEOUT 0 means line will be skipped Compiler will accept TIMEOUT 0 This is allowed since the adjustable timeouts must support zero time for dynamic shut off of functions A single line not included in a sequence will stay active Until 0 1 x TIMEOUT seconds have elapsed OR As long as the trigger is TRUE timeout override OR Until a higher priority trigger goes TRUE Timeout override in a sequence works differently Each line in a sequence will stay active until its timeout have elapsed The last line in a sequence will remain active until the trigger starting the sequence t
41. longer than 20 characters The names are defined in the APC file before the program code See example below gt Name H50 and TGF10 gt Timer A Sampling gt Timer B Pre Test Purge gt Timer C Accumulation gt Timer D Not used The timer names will be displayed when you change any of the adjustable times A to D The names will also be displayed above the progress bar displayed when the respective timer is running The progress bar function can be turned off by selecting an even PRIORITY index see PRIORITY above NOTE The first line in the example above defines the name of the APC driver or Probe it controls This name will show up in the H2000 PLUS menu system under APC Settings Probe Type 7 1 6 3 STOP Timeout A line with TIMEOUTS S will stay active until terminated by a higher priority trigger This feature can e g be used for positive acknowledgement of alarms IMPORTANT TIMEOUTS S can only be used on the last line in a sequence Setting TIMEOUT to S on any other line of a sequence will halt and subsequently terminate the sequence at that line The following lines in the sequence will never be executed See example 1b below for an example on how to use TIMEOUT S 23 7 2 Programming Hints 7 2 1 Setting ACCEPT and REJ ECT indicators The controllable output LEAK ALARM is normally HI when the sensor signal is above the Alarm Level This means that it may have gone low before a measur
42. n Thermal and Electronic 14 5 48 Panel Mount Model Connectors Rear view of panel mount detector Sch 1 C2 10 1 C3 10 Pin Type Signal Name Ci 1 SUPPLY 24 VDC 2 SUPPLY GND C2 1 OUT 24 VDC OUT 2 OUT 24 VDC OUT 3 GND 4 GND 5 GND 6 IN IN o 7 IN IN 1 8 IN IN 2 9 IN IN 3 10 IN IN 4 C3 1 GND 2 GND 3 GND 4 OUT DET_ERROR 5 OUT LEAK_OUT 6 OUT DET_ON 7 OUT DET_WAIT 8 OUT DET_SIGNAL 9 OUT CAL_CONF 10 OUT OUT_6 CA 1 GND 2 GND 3 GND 4 GND 5 OUT OUT 0 6 OUT OUT 1 7 OUT OUT 2 8 OUT OUT 3 9 OUT OUT 4 10 OUT OUT 5 49 14 6 Battery operated model General General Charger Input Connector Std 2 1 x 5 5 mm Positive centre Nominal Battery Voltage 24 VDC Fuse internally mounted 5A Fast Operating Time 4h Charging Time 12 h flat to fully charged Approx 1h to 1h operating time Overall Dimensions 275 x 155 x 170 mm Net Weight 5 5 kg 6 4 kg incl case probe charger Environment Temperature 0 50 C Humidity 10 90 RH Protection IEC529 IP64 front IP32 back Printer port Connector 9pol D sub male Standard RS232 E Sensistor Technologies Sensistor Technologies AB Box 76 581 02 Link ping Sweden Tel 46 0 13 355 900 Fax 46 0
43. n Coefficient The reference leak should have a flow near to or slightly bigger than your chosen leak alarm level See also section Selecting the reference Set the Calibration Coefficient equal to the calibrated flow of your reference leak This can be found on the calibration certificate issued for the leak N B Feed the reference leak at the pressure stated on the calibration certificate If another pressure is used you must correlate the resulting flow and use this value as Calibration Coefficient The Calibration Coefficient must reflect the flow through the leak at the moment you calibrate the H2000 PLUS detector N B Remember to set the Leak Rate Unit to the same unit as that used to express the leak rate of the reference leak Set up and calibration 1 Set leak rate unit to that specified on the reference leak 2 Set the Calibration Coefficient equal to the actual flow of the reference leak 3 Enter the Calibration menu and press START 4 If using a hand probe Immediately put probe on the opening of the reference leak Remove probe when gas has been detected Repeat steps 3 and 4 until calibration is OK 5 Press SAVE Example Reference leak rate is 4 2E 5 mbarl s Set Calibration Coefficient 4 20E 05 Set Leak Rate Unit mbarl s NOTE You will need to repeat the calibration typically 2 times to get Calibration OK after changing set up or probe Remember to allow at least 30 s be
44. nel according to figure above Remove burrs 2 Check that rubber o ring is in correct position in the grove around the edge of the detector 3 Put the detector in place in the panel hole 4 Hold the panel in place while fixing the mounting brackets to the detector See figure below 5 Align the detector horizontally and lock it by tightening the 4 set screws 6 Lock the set screws with the locking nuts 7 Connect ground terminal to protective ground of cabinet Set screw gt ei Bracket screws Bracket Electrical connections are described under Specifications below 4 Adjustable Parameters 4 1 Engineering Format Some of the parameters of the detector are written in engineering format This format can represent a very wide range of numbers from very small to very large numbers The following examples describes the format used in the detector 1 00E 01 1 00x10 10 1 00E 00 1 00x10 1 1 25E 02 1 25x10 0 0125 4 2 Description of Parameters Below is a list and description of all adjustable parameters of the H2000 PLUS detector The parameters are listed in order of their appearance in the menu system Please refer to the User Manual and the Service Menu sections below for the exact menu position of each parameter Contrast Brightness Screen Save Timeout Sensitivity Auto Range Direct Sensitivity Adjustment Lowest Frequency Dead Band Probe Type Contr
45. nt routine trig IN_1 CAL_REQ Calibration routine trig IN 2 FLOW OK Sniffer flow alarm switch FLOW_OK HI means sniffer flow is OK IN 3 PURGE REQ Purge routine trig OUT 0 H28 purging pump OUT 1 H28 valve V1 OUT 2 H28 valve V2 OUT 3 H28 valve V3 OUT 4 Not used OUT 5 Not used OUT 6 ACCEPT Test object accepted no leak found during test LEAK OUT REJECT Test object rejected leak found during test Included in the driver text are the following definitions of the probe and timer names gt Name H28 gt Timer A Sampling gt Timer B Pre Test Purge gt Timer C Accumulation gt Timer D Not used FF 2 H EA B pa LC Je Line reference PROBE ERROR CALIBRATE CAL CONF 2 O IIx ka uw PRIORITY MEASURE STAND_BY FOLLOW FOLLOW FOLLOW PURGE LEVEL HI FOLLOW IF DET SIGNAL LO FOLLOW MEAS LEAK FOLLOW IF LEAK OUT LO FOLLOW Line reference MEAS NO LEAK FOLLOW IF LEAK OUT LO FOLLOW DET SIGNAL HI CALIB PASS CALIB FAIL SENSOR ERROR lO Comments The H28 Sample Probe is set up to sniff from the fresh air port F between samples This makes sampling reliable and will disclose any prevailing gas background in the sampling area This way of operation is recommended but requires careful design of the test system It is also important to consider where to
46. obtained from Sensistor Technologies Simply send your request by FAX or email including the following information Subject Service Mode Password Name Job Title Name of Organisation Name of Division if applicable Serial Number of Detector Software Revision Number MCU X XX Se above FAX number 46 13 355901 e mail info sensistor se See Operators Manual on how to input pass word 33 10 2 Menu options When instrument has been set to service mode there will be an extra menu item Service Settings on the display Choosing Service Settings will display the following options 10 2 1 User Password If you have lost your user password you can retrieve it by choosing this menu option 10 2 2 System Reset Choosing this option will reset all parameters to factory standard See under Adjustable Parameters above for factory default values WARNING System reset will also change the software of a battery operated model If so the battery status symbol will disappear from the main screen If you need to reset a battery operated H2000 C PLUS check and record the setting of the Battery Mode parameter before performing the factory reset Set the Battery Mode parameters to the original setting after the factory reset The installed APC driver if any will also be deleted Reinstall the driver after the factory reset You will be asked to confirm this choice once before s
47. ollows TRIGGER PRIORITY FLAGs TAGs TIMEOUT FLAGs and outputs are set in the following order from left to right see examples MEAS PER PROBE_ERROR CAL_PER OUT 6 OUT 5 OUT 4 OUT 3 OUT 2 OUT 1 OUT 0 CAL CONF LEAK OUT 7 1 2 TRIGGERS The triggers are set TRUE or FALSE according to the status of internal flags alarms outputs and external inputs The pulse length on an external input should be at least 40 ms for certain switching of the corresponding triggers Execution of a line starts when its TRIGGER command is TRUE Execution will however not start if another line with same or higher priority is executing See further under PRIORITY NOT_USED Dummy trigger NOT_USED can be handy during debugging A single line can be turned off by changing the trigger to NOT_USED In a sequence the line will be skipped and execution will continue on next line STAND_BY TRUE if all other used TRIGGERs are FALSE and no other lines are running IMPORTANT Every program must include the STAND_BY trigger WARM_UP TRUE when instrument is in WARM UP mode after power on or when recovering after a sensor error NOTE A line trigged by WARM_UP is active during instrument start up regardless of line priority index IN 0 HI TRUE if IN 0 input is HI IN 0 LO TRUE if IN 0 input is LO IN 1 HI TRUE if IN 1 input is HI IN 1 LO TRUE if IN 1 input is LO IN 2 HI TRUE if IN 2 input is HI IN 2 LO TRUE if IN 2 input is LO IN 3 H
48. pective timer See further under TIMEOUT below Valid priority indexes are integers within the range of 0 255 The actual number used is not important apart from the odd even code Leaving gaps between the PRIORITY indexes used makes changing and debugging the APC program easier Each line in a sequence with one or more FOLLOW lines has its own PRIORITY A high PRIORITY on the first line only in a sequence will therefore not prevent termination in mid of sequence Different PRIORITY on different lines in a sequence can be used to define which steps that can be terminated by a certain event Example A line with PRIORITY 7 will terminate a line with PRIORITY 6 but not one with PRIORITY 7 or higher Choosing the right priority for each line is the most important skill to learn when writing APC programs Make sure you have tested all possible scenarios before using the program in your process 7 1 4 FLAGS There are 3 internal FLAGs that can be controlled by the APC program MEASURE Setting this flag H will start a measurement routine in the detector This measurement routine checks for leak alarms until the MEASURE FLAG is reset L again The trigger MEAS_LEAK will be set TRUE if gas signal goes above Alarm Level any time during the measurement period The trigger MEAS_NO_LEAK will be set TRUE if gas signal is below Alarm Level during the entire measurement period It is strongly recommended that MEASURE is reset L b
49. personnel If the operator lacks the necessary skill you can put calibration under the general password This is explained in the User Manual If protected you need to enter the password before starting a new calibration N B The detector is delivered with no password Calibration is only protected if a new password is set 5 4 Sensor condition indicator When the instrument is calibrating it shows a sensor condition indicator in the lower mid part of the screen This indicator can be used for an early warning as to when a sensor replacement will be needed A bar grows when the sensor is detecting reference gas The length of the bar shows the condition of the sensor The bar will become shorter if sensor has lost some sensitivity The scaling of the indicator is not exact enough to say at exactly what length the sensor must be replaced You will however learn when this happens for your particular application The instrument will also tell you in clear text when sensitivity is too low See further in the next section below 11 5 5 Calibration messages Below is a list of the different messages that can be displayed during calibration Message Explanation Remedy Expose to Prepare the probe for calibration by background holding it in hydrogen free background Detecting gas Gas signal is detected Normal operation gas exposure can be interrupted Repeat calibration Calibration was not within 20 of las
50. ram can be restarted to resume testing by activating a higher priority trigger Define one of the INPUTS as acknowledgement signal and add a line with that trigger with a higher priority See Example 1b below You can add several stop lines in the program just remember that any line with higher priority will restart the program 7 2 3 Sensor Purging Conditional purging of sensor and hoses should be controlled by the PURGE_LEVEL output Conditional purging on PURGE_LEVEL is highly recommended since this gives shorter recovery times Unconditional purging can be programmed as FOLLOW lines in a sequence or loop See how this is done in a flexible way for the measurement and calibration sequences of the H28 Sampling Probe in Example 1 Hardware controlled purging can also be programmed as shown in the example In this case an external device can order an unconditional purge by setting the corresponding trigger signal on the H2000 PLUS bus See also under Sequences below 7 2 4 Sequences A sequence is two or more lines written to execute in succession The first line can use any trigger except the following WARM_UP FOLLOW FOLLOW_IF 24 The following lines must all use FOLLOW or FOLLOW_IF triggers The most important thing to remember about APC sequences is that the APC programming does not support sub routine returns l e if a sequence is interrupted it will not resume once the interrupting condition has disappe
51. s Range in Hz Analysis Mode 0 5 PPM 0 2 H2 Sensitivity in Leak Detection Mode 5x10 cc s using 5 Ha tracer gas Repeatability Typically 10 of reading 0 3 PPM Linearity within 0 1 10 x calibration point Typically 15 within 0 5 100 PPM Valid for non sniffing probes only Refer to probe data sheet for other probes 14 2 45 Table Top Model General General AC Input Connector IEC 320 AC Mains Voltage 100 240VAC 50 60Hz AC Mains Current Typically 1A 2A pulse at power on Fuse 4 A slow Overall Dimensions 275x155x170 mm Net Weight 4 6 kg Environment Temperature 0 50 C Humidity 10 90 RH Protection IEC529 IP64 front IP32 back Printer port Connector 9pol D sub male Standard RS232 Probe Control Port Connector 25 pin D sub female Inputs Minimum pulse length 40 ms Input Impedance 50 kohm Input Maximum Range 34 to 38 VDC Input HI gt 12 0 VDC Input LO lt 8 0 VDC Outputs Output Current max 0 5A output max 2 5 A total Inductive Loads HI State Voltage Drop External clamp diodes recommended lt 2 5V from Supply Voltage at max current LO State Voltage LO State Leakage Current Max 1 5 VDC Max 100 uA Short Circuit Protection Thermal and Electronic 46 14 3 Table Top Model Probe Control Port Connector Connector is 25 pin female D sub
52. s returned if the selected driver supports active test F failed is returned otherwise Print Request Returns current analysis value Printer Analysis Data Output is activated Returns a P Set APC in stand by stop a measurement Returns a Q Activates probe 0 built in H50 driver Returns an R Activates probe 1 Installed probe driver Returns an S Shift State to Analysis Mode Returns nothing Shift State to Detection Mode Returns nothing 32 10Service Mode The detector is equipped with a service mode to help in trouble shooting and diagnostics IMPORTANT The normal operator should not enter this mode The service mode menu option is therefore normally not shown in the menu system and most of the functions in the service mode are protected by a special password IMPORTANT We strongly recommend that the service mode log in procedure is kept secret from al personnel not fully trained in the details of all functions of the detector 10 1 Logging in Service Mode Log In Procedure Switch power OFF Press and hold the right display button Switch power ON Release right button when text appears Fons During warm up the display will show software revision numbers and date and time of the real time clock along with the results of the self tests performed at power on All menu items except showing the service mode display are locked by a password The password can be
53. s which information that will be printed according to the following table Probe Type Data printed Counter Flow Hand Probe AP57 1 2 3 4 6 Sniffer Hand Probe AP55 1 2 5 4 6 Sampling Units AP29 and H28 1 2 5 4 6 APC driver with active test using MEAS flag 1 2 5 4 6 APC driver not using MEAS flag 1 2 3 4 6 40 11 2 4 Analysis Data Output The Analysis Data Output option is intended for transferring test results to a supervising computer system such as e g a PLC system 11 2 4 1 Communication Specifications Data Rate 9600 baud Data bits Stop bits Parity Flow Control 8 1 None None Data Format for Analysis Data Output Print time 9 ASCII characters 7 characters showing value in engineering format see under Engineering Format 1 character indicating the result of the test 1 linefeed LF character The character indicating the result of the test is one of the following A Accept Previous test was below leak alarm limit R Reject Previous test was above leak alarm limit P Rejected by Purging Previous test was above purge limit and leak alarm limit C Calibration approved Previous cycle was calibration Calibration was approved F Calibration failed Previous cycle was calibration Calibration failed E Test interrupted by Error that occurred during cycle probe or sensor error etc Example 2 5E 04R LF Passive probes Data is printed when sign
54. sequence set the CALIBRATE flag This same line should also set the probe to expose the sensor to the calibration gas pulse from reference gas or calibrated leak 7 2 7 Verifying the APC program When verifying your program be very careful to test all combinations of all used inputs and gas signals of different sizes below and above the Leak Alarm and Purge Levels IMPORTANT The most important thing is to make certain that there is no combination of signals that can make your system PASS a leaking test object If you have problems finding a bug it may prove handy to set the detector in service mode When in this mode the display will show which line number that is currently executing along with how long the line has been executing The status of all inputs and outputs are also displayed See Service Mode section Another great help in developing APC drivers is the Bus Test Box 2000 BTB2000 This is a combined 3 way hub and bus indicator simulator It has LEDs showing the status of all inputs and outputs and switches allowing you to set the status of all inputs 25 7 3 APC Program Example 1 The following example is an APC program for the H28 Sample Probe It is given here as an example for pedagogic reasons only NOTE The program below is only an example The H28 is no longer produced or marketed In the example the non specific inputs and outputs have been assigned the following functions IN_O MEAS_REQ Measureme
55. t Wait 30 s and calibrate again Calibration OK Calibration was within acceptable limit Press save to store calibration in memory No gas or unstable signal No gas signal or no stable signal detected during calibration Signal when reference gas is shut off Happens for reference gas only Check reference Gas valve may be shut Check that probe tip is not clogged Background is higher than reference gas concentration Improve ventilation Sensitivity too low for alarm level Sensitivity of sensor is too low to guarantee correct response to a gas flow or concentration equal to the leak alarm level The most likely reason is that sensor is too old Check reference Gas valve may be shut Check that probe tip is not clogged Check setting of Leak Alarm Level Replace sensor if problem remains High signal Check reference Reference signal is abnormally high Check that reference gas mix is not replaced with tracer gas mix Check condition of reference Check that reference leak connections has no leaks If calibration fails you can still use the instrument Last valid calibration parameters will be used You should however check that the instrument reacts to the reference 12 6 Active Probe Sampling This section applies mainly to integral testing using a gas collecting hood or chamber Sampling in the hydrogen method is most commonly done at atmospheric pressure
56. the maximum signal comes after that the calibration time has terminated 5 2 3 Calibration Coefficient The Calibration Coefficient tells the detector the magnitude of the reference leak flow or reference gas concentration respectively Set the Calibration Coefficient equal to the calibrated value of your reference See also under Leak Rate Unit above Check afterwards that the calibrated instrument gives the correct reading when the probe is exposed to the reference After a calibration the display will show the measured value using the updated calibration value internal This value can deviate slightly from the calibration coefficient This is due to variation in the previous calibrations H2000PLUS uses the average of recent calibrations to calculate the calibration factor 5 2 3 1 when measuring hydrogen concentration when measuring hydrogen concentration instead of leak flow you should calibrate the detector against a reference gas with a known concentration The reference gas should be Hydrogen in Synthetic Air Hydrogen in Nitrogen can also be used but the accuracy may not be as good The concentration of the reference gas should be chosen near to the alarm level or primary target range and always within the range of 2 PPM 400 PPM Select the concentration preferably at or slightly above the Leak Alarm Level for best accuracy See also section Selecting the reference Set the Calibration Coefficient
57. the right position see list below To install driver insert the disc into the disc drive of your computer Double click the APC icon Turn off the H2000 PLUS Connect the file transfer cable between the H2000 PLUS serial port and a COM port on you computer Select desired language Select the COM port that you connected the cable to Press the OK button in the window Turn on the H2000 PLUS 0 Wait until the message The driver is installed is shown 1 The installation is ready Quit the program As PMP ONnNOaPrRw hd For more information press the Help button on the PC sceen 30 8 Downloading parameters to H2000 PLUS 8 1 Settings of the RS232 serial communication Data Rate 9600 baud Data bits 8 Stop bits 1 Parity None Flow Control None Parameters can also be downloaded if the H2000 PLUS printer setting is set to PC Printer See under Printer Port for RS232 settings 8 2 Supported Parameters The following parameters can be downloaded to H2000 PLUS in Analysis and Detection mode H2000 Parameter Header Data Leak Alarm Level A n nnE nn Calibration Coefficient B n nnE nn Leak Rate Unit C Text string max 12 characters Timer A D nnn Timer B E nnn Timer C F nnn Timer D G nnn Purge Level H n anE nn entered as integer in 10 s of seconds 1 0 1s 100 10s 60000 6000s 8 3 Transfer of parameters Send parameters one by one first send the specific header e g AT then
58. tput CAL_CONF Hi when if last was calibration successful Group 4 Digit 12 Digit 13 Digit 14 Digit 15 Digit 16 DET SIGNAL Status of external output DET SIGNAL DET WAIT Status of external output DET_WAIT DET ON Status of external output DET ON LEAK OUT Status of external output LEAK OUT DET ERROR Status of external output DET ERROR 37 10 4 Service Mode I O Control Service Mode Program 0 3 5s Detect 5 132498 Signal 0 0e 00 DSP Out 0 00 00 000 00000 00 ADC V 1 861459 000 0000000 0 00100 Toggle lt OUTO gt Menu This service mode screen will help when installing or debugging an installation It shows the current status of all inputs and outputs see previous pages It is also possible to manually override force the states of the outputs and inputs of H2000 PLUS In the figure above the digits in bold are the controllable inputs and outputs The flashing underscore shows which UO will be affected when the toggle button is pressed The name of the selected I O signal is presented in the centre of the bottom line Move between the I Os with the two buttons under the lt and gt Press the Toggle button to change the state The state toggles between Qor1 No manual override I O is controlled by H2000 PLUS H High L Low When an I O is manually set high or low neither the APC program nor external inputs affects that I O The APC program
59. tween calibrations for best accuracy Go to Analysis Mode and check that the detector shows the same value and unit as marked on the reference leak allowing for the specified uncertainty of detector and reference 10 5 2 3 3 Selecting the reference Your reference should have a concentration or flow equal to or slightly above what you want to measure See the examples below for specific recommendations Instrument specification is valid for concentrations ranging from 0 1 to 10 times the leak alarm level but not outside the sensitivity range 0 5 to 2000 PPM You should use reference gas if measuring Hydrogen concentration and a reference leak if measuring leak flow Example for reference gas Leak alarm level is set at8 PPM A reference gas mix containing 8 PPM hydrogen in synthetic air will give best accuracy For good accuracy reference gas should be within 50 of leak alarm level In this example this means 4 to 12 PPM Hydrogen Concentration of hydrogen should always be within 2 PPM to 400 PPM Example for reference leak Leak alarm level is set at 2 0E 4 atm cc s A reference leak calibrated to 2 0E 4 cc s will give best accuracy For best accuracy reference leak should be within 50 of leak alarm level In this example this means 1 0E 4 to 4 0E 4 atm cc s 5 3 Password protected calibration Correct calibration is essential for the Quality Assurance Calibration should be done regularly and by adequately trained
60. ut when line 4 starts and sampling ends when IN 0 goes LO again Do not set APC Time A sampling time to zero as this will inhibit sampling altogether Line 5 will execute if signal goes above the Purge Level The sampler will purge the sample hose by starting the purge pump and valve V3 Line 5 also sets the REJECT output since the Purge Level could not be set below the Alarm Level Line 5 has priority 100 which means that it can interrupt a measurement which has priority 51 lines 3 and 4 NOTE The trigger MEAS _LEAK will be set even if the measurement is interrupted by line 5 See also comment on lines 9 and 12 Lines 6 to 8 form the calibration sub routine call Line 6 defines IN_1 as the calibration request signal input 27 Line 7 checks that the sensor is properly recovered If not the calibration sequence is terminated and must be retrigged once DET SIGNAL has gone LO again Line 8 sets the H28 in calibration mode and then sets the CALIBRATE flag HI which will cause the calibration routine of the detector to start Line 8 will also reset the CAL_CONF flag to LO This is done since the supervising system has considered the sensor needs to be calibrated Calibration exposure time is set under General Settings menu and can not be determined by the length of the calibration request signal on IN_1 Holding IN_1 HI will cause the program to stop and wait on line 17 or 18 until IN_1 goes LO again Lines 9 to 14 form
61. w contribution to the gas concentration in the chamber This is due to insufficient circulation in the confined space in front of the leak Due to such phenomena it is essential that such influence from location is carefully tested before commissioning the system Affix your reference in all problematic positions and measure the response Find the point of lowest signal The easiest way to do this is to use a mass flow controller to set up the reference leak flow through a small hose that can be fitted in the respective positions If there is a reasonable way of making the mixing better do that If not set your leak alarm limit with respect to the point of lowest sensitivity This will result in a risk that a few leaks just below the limit are being rejected but safeguards that no leaks above the limit are being passed Makes sure by repeated testing that leaks in the least favourable position are reliably detected The sample hose inlet is best placed in the circulation bypass downstream of fan pump If no alarm is provided for the circulation flow it is better to place the inlet close to the primary leak point to minimise the consequences of circulation pump or fan failure If the reference is placed in the chamber it should be placed down stream of the sample inlet 7 Active Probe Control NOTE Battery operated model H2000 C PLUS does not incorporate the APC feature described in this section Hydrogen Leak Detector H2000 PLUS is equippe
62. y all lines not starting a measurement Sequencing is not possible after a line setting the MEASURE flag Follow lines after this line will never execute NOTE The detector analyses the sensor signal continuously when not in WAIT routine Setting the MEASURE flag only means asking the detector if the signal goes above the Alarm Level any time during this particular period of time 19 PROBE ERROR When set H this flag trigs the probe error routine PROBE ERROR should be reset L by all lines except those indicating an error in the probe The probe error routine automatically performs the following 1 Show Probe Error alarm text 2 Set the red status LED in fast flashing error mode 3 Set DET_ERROR output HI IMPORTANT If you use controllable outputs as Test Accepted and Test Rejected indicators you should set the Reject output HI and the Accept output LO on all lines detecting events that can jeopardise the test result The LEAK_OUT should be used as Test Rejected output in such cases CALIBRATE Setting this flag HI will start the instrument calibration routine when execution of line ends The calibration routine is independent of the APC programming TIMEOUT of this line should be set to 1 or higher The timeout of the calibration is the Calibration Time set in the General Settings menu on the display The detector will log max gas signal during the calibration period The follow
63. ystem is reset Consider the work of resetting every parameter to suit your application before you perform a system reset 10 2 3 Detector Signal Level The Detector Signal Level is the level below which the sensor is considered to have recovered from the last gas signal The Detector Signal Level decides when the DET_SIGNAL output will come on This signal can be used to block the start of a calibration or new test cycle in semi and fully automatic testers If DET SIGNAL is high this means that the sensor has detected hydrogen and has not yet recovered You can increase Detector Signal Level if you have many small disturbing signals Be aware however that this may give poorer accuracy A high setting of Detector Signal Level gives better tolerance to noise gas signals at the expense of accuracy A low setting gives best accuracy but lower tolerance against noise gas signals The Detector Signal Level is set as 1 to 100 of the Leak Alarm Level Default is 20 34 10 2 4 Min Calibration Time This parameter sets the lowest possible Calibration Time that can be set under the General Settings menu Default is 5s Min calibration time should be set to safeguard that the following two requirements are fulfilled 1 The hydrogen from the reference leak or gas line must reach the sensor before end of calibration time 2 The sensor must have time to reach its maximum signal before end of cal

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