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ACM DTM Series, Инструкция по установке и эксплуатации

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AMC-DTM-Sensor Transmitter 

 

 

 

- 24 - 

 

6.2 Calibration Procedure 

When operator enters “calibrate” menu, “calibrate the unit?” question is presented.  If the 
operator confirms that their intention is to calibrate the unit, the unit drives 4-20mA output to 
2mA and de-asserts all gas alarms.  This state is retained for 2 minutes after the calibration is 
over to allow gas sensor to recover from the high gas concentration applied during calibration. 
Calibration is deemed over after the operator leaves the “calibrate” menu, either by successfully 
completing calibration or by canceling calibration. 

 

6.2.1 Zero 

Adjustment 

 

 

ALARM 1 
> 50.0%LEL 

 

F

A1 A2 A3

 

Figure 6-2: Alarm 1 Menu 

 
Operator chooses “calibrate”, “Zero” in the menu.  Operator then applies Zero gas concentration 
to the sensor.  Sensor displays the current concentration of the gas in the upper line and a 
moving block character in the lower line. Zero Buffer functionality is inhibited during calibration 
to enable operator to see the exact measured gas concentration. The block character moves 
from left to right if the concentration is rising and from right to left if it is falling.   The unit 
measures average concentration over an averaging period of about 10 seconds.  When the 
average concentration difference between the two successive 10 second periods is less than 
1% of the average concentration, the block character slows down.  The unit then tries to detect 
that the concentration has stabilized.  It does so by waiting for two rising slopes and two falling 
slopes of the average 10 second concentration.   Since this is a random process, it usually 
takes longer than 40 seconds.  When this is detected, the block character is replaced with a 
question “ok. proceed?”.   
 
Operator does not have to wait for the “ok. proceed?” question to calibrate.  Operator can at any 
moment during the calibration press “yes” button to accept the currently measured 
concentration as the calibrating point.  
 
If this process takes longer than 5 minutes, the unit displays the question “unstable. cancel?”.  If 
“yes” is pressed, the calibration is cancelled.  If “no” is pressed, the calibration continues 
unaffected.  
 

Содержание DTM Series

Страница 1: ...and carefully before installing and operating of this equipment filename Manual_DTM_Transmitter doc Original 09 June 2004 Copyright June 2004 The Armstrong Monitoring Corporation 215 Colonnade Road South Nepean Ontario Canada K2E 7K3 Tel 613 225 9531 Fax 613 225 6965 U S Toll Free 800 465 5777 E mail gas armstrongmonitoring com Internet www armstrongmonitoring com ...

Страница 2: ......

Страница 3: ...7 5 Operation 9 5 1 Operator Interface 9 5 1 1 Touch Screen Keypad Operation 9 5 1 2 Liquid Crystal Display 10 5 2 Device Programming Menu 12 5 3 Features 16 5 3 1 Keypad Inactivity 16 5 3 2 Scroll Speedup 16 5 3 3 Key Press Indication 16 5 3 4 Displaying Currently Configured Values 16 5 3 5 Fail Alarm Condition 16 5 3 6 Power Up Sequence 17 5 3 7 Manufacturing Data 17 5 3 8 Modbus 17 5 3 9 Test 1...

Страница 4: ... 5 5 8 Password 21 5 5 9 Relays Option 22 6 Calibration Procedure 23 6 1 General 23 6 2 Calibration Procedure 24 6 2 1 Using Gas Depletion As A Measure Of Another Gas s Concentration 25 7 Preventive Maintenance 26 7 1 Maintenance 26 7 2 Sensor Replacement and Wiring 26 7 2 1 Sensor Interface 27 Appendix A Modbus Accessible Data 28 ...

Страница 5: ... and operation of this equipment AMC shall have no liability for labour or freight costs or any other costs or charges in excess of the amount of the invoice for the products THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FA...

Страница 6: ...r Sensor Transmitter Unit Order Number Transmitter Part Number Transmitter Serial Number Sensor Part Number Sensor Serial Number Power Supply Requirements 12 to 24 Vdc 70 mA 2 2 Factory Settings Gas Type Range Zero Gas at 4 mA signal Gas Concentration at 20 mA signal ...

Страница 7: ...ntrusive operator interface allowing calibration and configuration This allows the operator to calibrate and change settings while maintaining the explosion proof integrity of the transmitter These changes are made using a touchscreen keypad that is accessible through the glass window of the enclosure using your finger The DTM provides several different outputs for interconnectivity There is a 4 t...

Страница 8: ... clean and dry Mount the sensor transmitter in a location such that it will not experience submersion in liquids exposure to extreme temperatures and electrical noise signals The sensor housing SHOULD NOT touch the mounting surface In some cases it may require the use of a spacer between the mounting surface and the transmitter housing as per Figure 4 1 Note Mounting arrangement of transmitter hou...

Страница 9: ...art an example is shown below for selecting the right cable using the graph in Figure 4 2 and the following formulas Please note that some non AMC equipment may have the load resistance built in EXAMPLE Refer to Figure 4 2 Known data Obtained from measurements ratings or specifications Power supply 17 VDC Load resistance 180 Ohms Wire gauge 20 AWG Cable length 1 Ohm resistance 43 6ft 13 3m typical...

Страница 10: ...AMC DTM Sensor Transmitter 4 Figure 4 2 Cable Selection Graph ...

Страница 11: ...tage VIN 12 24 VDC Power Consumption 5 0 2 5 W Table 4 1 Input Power Supply 4 3 2 Analogue Output 4 20 mA For installation to a DC Power Supply only the AMC DTM series sensor transmitter is field wired as illustrated in Figure 4 3 The terminal block pinout for TB 3 is given in Table 4 2 and output specifications are provided in Table 4 3 Figure 4 3 Typical Field Wiring of AMC DTM to DC Power Suppl...

Страница 12: ... are provided in Table 4 3 Figure 4 4 Typical Field Wiring of AMC DTM to AMC Monitor Terminal Type Description 1 PWR Input Voltage 2 PWR Input Voltage 3 ANALOG OUT 4 20mA Output Signal S 4 PWR Power Supply Common 5 PWR Power Supply Common Table 4 2 TB3 Interface Pinout Value Parameter Min Typ Max Units Load Resistance n a 250 275 ohms Loop Current 0 25 21 mA Conductor Size See Note 16 AWG Table 4 ...

Страница 13: ...able 4 5 and Table 4 6 Figure 4 5 Typical Field Wiring of Multidrop MODBUS Installation Terminal Type Description 1 IN OUT RS485 Transmit Receive Data A T RXA 2 IN OUT RS485 Transmit Receive Data B T RXB Table 4 4 TB2 Interface Pinout Value Parameter Min Typ Max Units data rate 1200 19200 57600 bps Parity NONE EVEN ODD Data Bits LSB sent first 8 Bits Stop Bits 1 Bits Start Bits 1 Bits Voltage 5 24...

Страница 14: ...eter Min Typ Max Units data rate 1200 19200 57600 bps Parity NONE EVEN ODD Data Bits LSB sent first 7 Bits Stop Bits 1 Bits Start Bits 1 Bits Voltage 5 24 VDC Conductor Size 26 16 AWG Table 4 6 RS485 Interface Specification ASCII Modbus Mode ...

Страница 15: ... explosion proof integrity of the transmitter LED s A1 A2 and A3 denote active alarms when illuminated in the color red LED F denotes unit failure when illuminated in the color amber Figure 5 1 Transmitter Operator Interface 5 1 1 Touch Screen Keypad Operation The touch screen keypad consists of four targets as illustrated in Figure 5 2 that are activated by either touching the sensor pad itself o...

Страница 16: ...lay LCD displays 12 characters in each of the two lines 2x12 The color of the characters is yellow on dark blue background During normal operation the transmitter shows the gas label in the first LCD line and the current gas concentration in the second line expressed in the chosen Engineering Units See Figure 5 3 Engineering Units section 5 5 5 describes different formats of the gas concentration ...

Страница 17: ...ALARM 2 and ALARM 3 to an operator defined value See Figure 5 5 fan is on 10 0 LEL F A1 A2 A3 Figure 5 5 Alarm display renamed alarm Active alarms are displayed in flash cycles together with the Default Display Up to four displays can be shown this way three gas alarms and the default display Gas alarms are mutually exclusive They can be active in any order or combination During the Minimum Run Ti...

Страница 18: ... LCD err 140 l F A1 A2 A3 Figure 5 8 FAIL Alarm display 5 2 Device Programming Menu The following is a graphical representation of the programming menu of the transmitter provided for assisting the operator in configuring the transmitter parameter Silence_____ all_________ alarm 1_____ alarm 2_____ alarm 3_____ log in______ 0___________ calibrate___ Zero________ stable Span________ 0000 0ppm___ st...

Страница 19: ...sing__ decreasing__ On Delay____ 00min_______ Silence_____ 00min_______ Run Time____ set value___ 00min______ infinite____ name________ ALARM 1_____ alarm 2_____ alarm 3_____ Range_______ 0000 0ppm___ Hysteresis__ 0 0 Range___ Zero Buffer_ 0 0 Range___ gas label___ name________ relays______ alarm 1 __ norm eng____ ...

Страница 20: ...vanced____ password____ enter old __ 0___________ enter new __ 0___________ new again __ 0___________ Modbus______ address_____ 001_________ type________ ASCII_______ RTU_________ data rate____ 1200bps_____ 2400bps_____ 4800bps_____ 9600bps_____ 19200bps____ 38400bps____ 57600bps____ sensor______ ...

Страница 21: ...sitive _ 000mV_______ negative _ 000mV_______ fail detect_ manuf data_ s w version_ Eng Units__ ppm_________ ppb_________ LEL________ VOL________ pre configs_ unconfi 86AA NH3____ 86AD NH3bla_ 91AE CO_____ 91AF CO_____ _________ factry test_ alignment___ unit reset__ A D readout_ uA mV wiper_ 4 20mA______ ...

Страница 22: ... Menu mode provides information about the current configuration values Section 5 2 Device Programming Menu of this manual illustrates the Menu Structure The menu operates as follows When setting numerical or text values the current value is displayed e g Range alarm name When choosing a value from a list the currently chosen value is displayed with a in front of it when the list is first displayed...

Страница 23: ...enable the sensor to stabilize At the outset of this period unit resumes normal operation and raises or clears any alarms as needed 5 3 7 Manufacturing Data The manufacturing data that the transmitter stores is the software version information This information is programmed into the non volatile memory together with the software load itself 5 3 8 Modbus The transmitter is a Modbus slave device tha...

Страница 24: ...is not activated until the concentration remains above the threshold for Activation Delay period of time The Activation Delay Timer is adjustable from 0 to 99 minutes in increments of 1 minute Silence Timer Activation Delay silence button relay output silenced during Minimum Run Time Silence Timer silence button relay output silenced just before gas conc dropped Silence Timer 0ppm Threshold Hyster...

Страница 25: ...lence Timer is set to 0 5 5 Transmitter Options These options apply to the whole unit as well as all three gas alarms 5 5 1 Gas label Gas labels may have a maximum of 12 characters The label is displayed on the first line of the Gas Concentration Display The operator can change the default label Note It is considered good practice to include the gas type in the label name for example Cl2 west wall...

Страница 26: ...nce point to set the saturation point for the 4 20mA output current loop When measured gas is of equal or higher concentration than Range output current is driven to 20mA It is usually set close to the highest gas concentration the sensor can measure saturation point The transmitter is capable of showing concentration values greater than the Range up to maximum of 21mA 5 overshoot assuming that th...

Страница 27: ...minal electrochemical sensors that have both positive and negative going current signals Two additional electrode connections are supported for future development purposes 5 5 7 2 Polarity The sensor can act as either current source or current sink 5 5 7 3 Ref Bias The reference electrode bias voltage is from 499 mV to 499 mV 5 5 7 4 No Sensor Fail Detection The transmitter can detect sensor prese...

Страница 28: ... Relay 2 alarm 2 Relay 3 alarm 3 Relay 4 fail alarm All four relays can be configured as normally energized or normally de energized It is recommended that the Fail Alarm is normally energized and that the Gas Alarms are normally de energized to ensure the proper operation during power failure Fail asserted Gas Alarms de asserted ...

Страница 29: ...menu log in options advanced pre config Gas sensor is calibrated using two gas concentrations Zero concentration and an adjustable concentration value Span Calibration is deemed completed when both Zero and Span points have been calibrated Figure 6 1 illustrates the basic equipment step up to calibrate the AMC DTM sensor transmitter Figure 6 1 Basic equipment step up for calibration ...

Страница 30: ...rator to see the exact measured gas concentration The block character moves from left to right if the concentration is rising and from right to left if it is falling The unit measures average concentration over an averaging period of about 10 seconds When the average concentration difference between the two successive 10 second periods is less than 1 of the average concentration the block characte...

Страница 31: ...uard against the possibility of an incorrect or incomplete calibration the newly calibrated points are compared with the previous calibration points If new Span point is off by more than 20 of the value of the previous point a warning is displayed requiring the operator to confirm if the values are correct or not If the new Zero value is different from the old one by more than 3 of Range similar w...

Страница 32: ...a fixed 1 mA signal 2 When the sensor no longer responds to the presence of gas or produces an unstable zero signal When the sensor needs replacing reorder the Sensor Part Number listed in section 2 1 Transmitter See Figure 7 1 for sensor replacement and wiring procedure Advisory Allow 24 hours for the new sensor element to stabilize burn in before recalibration then follow instructions in the tra...

Страница 33: ...ons at terminal block TB 1 for both sensor types The terminal block pinout for TB 1 is given in Table 7 1 Figure 7 2 Typical Wiring of AMC DTM to 3 Wire and 2 Wire Sensors Terminal Type Description 1 ANALOG AUX Input 2 ANALOG AUX Input 3 ANALOG Sensor REFERENCE electrode R 4 ANALOG Sensor SENSE electrode S 5 ANALOG Sensor COUNTER electrode C Table 7 1 TB1 Interface Pinout ...

Страница 34: ...reasing 2 decreasing 5 3 16 6 RW Alarm 2 type LSB bits 0 1 0 disabled 1 increasing 2 decreasing 6 3 16 6 RW Alarm 3 type LSB bits 0 1 0 disabled 1 increasing 2 decreasing 7 3 16 6 RW Alarm 1 threshold 8 3 16 6 RW Alarm 2 threshold 9 3 16 6 RW Alarm 3 threshold 10 3 16 6 RW Alarm 1 silence timer value 0 99 minutes 11 3 16 6 RW Alarm 2 silence timer value 0 99 minutes 12 3 16 6 RW Alarm 3 silence ti...

Страница 35: ... is in Activation Delay state 1 alarm is on Silence timer is active or Run Timer is active Coil 3 1 R Fail Alarm status Coil 0 off 1 on Coil 4 1 R Includes decimal points E g if concentration of 1ppm is recorded as 10 concentration of 1 2 is recorded as 12 Although the unit can display current concentrations of 5000 0 to 5000 0 this number is limited to 3276 8 to 3276 7 Concentrations smaller than...

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