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8 • T3A Transmitter

Specifications

Table 1 lists specifications for the T3A.

Table 1: Specifications

Target Gas

Detection Range

Increments

Haz. Loc.

Ammonia

0-100 ppm

1 ppm

Cl. 1 Div. 2

0-200 ppm
0-400 ppm

Carbon Dioxide

0-5.0% volume

0.1% volume

Cl. 1 Div. 1

Carbon Monoxide

0-300 ppm

1 ppm

Chlorine

0-3.0 ppm

0.1 ppm

Cl. 1 Div. 2

0-10.0 ppm
0-20.0 ppm

Chlorine Dioxide

0-1.00 ppm

0.01 ppm

0-5.0 ppm

0.1 ppm

Combustible Gas

0-100% LEL

1% LEL

Cl. 1 Div. 1

Hydrogen Chloride 0-30 ppm

1 ppm

Cl. 1 Div. 2

Hydrogen Cyanide

0-30 ppm

Cl. 1 Div. 1

Hydrogen Fluoride

0-10.0 ppm

0.1 ppm

Cl. 1 Div. 2

Hydrogen Sulfide

0-100 ppm

1 ppm

Cl. 1 Div. 1

Nitric Oxide

0-100 ppm

Cl. 1 Div. 2

Nitrogen Dioxide

0-20 ppm

1 ppm

Oxygen

0-25.0% volume

0.1% volume

Phosphine

0-5.0 ppm

0.1 ppm

Cl. 1 Div. 1

Sulfur Dioxide

0-20 ppm

1 ppm

Sampling Method

Diffusion

Enclosure Ratings

Explosion/Flame-Proof

Hazardous

Location

Certification

Class I, Division 1 (or Division 2),

Groups C, D
Ex db IIB T6 Gb
Class I, Zone 1, AEx db IIB T6 Gb

Operating Voltage

12 - 35 VDC

Current Draw

250 mA max

Operating

Temperature

Range

-40°C to +54°C (-40°F to +129°F)

Humidity Range

0 - 98% relative humidity, non-condensing

Содержание 71-0533

Страница 1: ...RKI Instruments Inc www rkiinstruments com T3A Operator s Manual Part Number 71 0533 Revision P2 Released 12 7 20 ...

Страница 2: ...ration and maintenance of the detector is essential for proper operation and correct readings Please calibrate and maintain this detector regularly Frequency of calibration depends upon the type of use you have and the sensor types Typical calibration frequen cies for most applications are between 1 and 3 months but can be required more often or less often based on your usage ...

Страница 3: ...osts local repair costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS EXPRESSED OR IMPLIED AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS INC INCLUDING BUT NOT LIMITED TO THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT SHA...

Страница 4: ... D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTERETENIR OU DE RÉPARER L ÉQUIPEMENT CAUTION THIS AREA MUST BE FREE OF FLAMMABLE GASES DURING CALIBRATION ATTENTION CETTE ZONE DOIT ETRE EXEMPTE DE GAZ INFLAMMABLES PENDANT L ETALONNAGE CAUTION TO PREVENT IGNITION OF EXPLOSIVE ATMOSPHERES remove from explosive atmosphere BEFORE SERVICING Warning A conduit seal must be used within 18 inches of the encl...

Страница 5: ...d Latching Alarms 26 Magnetic Buttons 25 Powering the Device 25 Faults 26 Accessing Menus 27 Product Settings and Configuration 28 Entering the Product Settings and Configuration Menu 28 Alarm Test 29 System Information 29 Zero Calibration Timer Information 30 Unit Information 31 Latching and Auto Resetting Relay Settings 31 Relay Fail Safe Setting 32 Fault Terminal Fail Safe Setting 34 Calibratio...

Страница 6: ...sor Replacement 45 Fuse Replacement 46 Calibration Frequency 48 Calibration 48 Materials 48 Zeroing the Sensor 48 Calibrating the Sensor Manual Cal 50 Calibrating the Sensor Auto Cal 51 Parts List 53 Appendix A Introduction to 4 20 mA Current Loop Signals 55 Appendix B Modbus Communications 57 Appendix C Modbus Register Map 59 ...

Страница 7: ...the instructions reference the use of push buttons located on the front panel of the device In certain environments the activation of the non intrusive magnetic switches through the use of the magnetic tool will replace the directive of the button press actions To apply the magnetic tool hold the tool to the side of the device enclosure adjacent to the push button that you wish to activate When th...

Страница 8: ...m 1 ppm Cl 1 Div 2 Hydrogen Cyanide 0 30 ppm Cl 1 Div 1 Hydrogen Fluoride 0 10 0 ppm 0 1 ppm Cl 1 Div 2 Hydrogen Sulfide 0 100 ppm 1 ppm Cl 1 Div 1 Nitric Oxide 0 100 ppm Cl 1 Div 2 Nitrogen Dioxide 0 20 ppm 1 ppm Oxygen 0 25 0 volume 0 1 volume Phosphine 0 5 0 ppm 0 1 ppm Cl 1 Div 1 Sulfur Dioxide 0 20 ppm 1 ppm Sampling Method Diffusion Enclosure Ratings Explosion Flame Proof Hazardous Location ...

Страница 9: ...personal injury Be sure to maintain and periodically calibrate the T3A as described in this manual Signal Output 4 to 20 mA 3 wire RS 485 Modbus RTU Relay Contact Ratings 3A at 24 VDC 115 VAC and 250 VAC each relay terminal protected by a 4A fuse Enclosure Material Aluminum Sensor Housing Material 303 Stainless steel Dimensions 5 5 D x 6 W x 7 H Weight 6 lbs Table 1 Specifications ...

Страница 10: ...ernal Component Location 1 MENU button 8 Sensor housing assembly 2 Front panel thumbscrew 9 Rain guard 3 Enclosure 10 Magnetic tool 4 Explosion proof plug 11 Alarm 1 LED 5 SUB button 12 ADD button 6 Mounting hole 13 Enclosure lid locking screw 7 Alarm 2 LED ...

Страница 11: ...t Location 1 RS 485 Modbus terminal block 5 Sensor housing socket 2 Fault terminal block 6 Not installed in T3A 3 Power input 4 20 mA output terminal block 7 Relay 1 terminal block if relays installed 4 Not installed in T3A 8 Relay 2 terminal block if relays installed ...

Страница 12: ...ystem 9 Sensor element 3 Not installed in T3A 10 Rain guard 4 Enclosure body 11 Sensor housing cap with flame arrestor for Class 1 Div 1 assemblies without flame arrestor for Class 1 Div 2 assemblies 5 Not installed in T3A 12 Analog sensor board 6 Not installed in T3A 13 Sensor housing plug 7 Explosion proof plug ...

Страница 13: ... T3A in a location where airborne particles could cover or coat the sensor NOTE These guidelines are ONLY intended as a general directive for the placement of the T3A This information should NOT serve as a complete list when considering all potential parameters for the proper location of the unit It is STRONGLY advised that a third party Certified Industrial Hygienist or other Certified Safety Pro...

Страница 14: ...14 T3A Transmitter Figure 4 Mounting the T3A ...

Страница 15: ... remove the terminal board from the internal system 1 Unscrew the enclosure lid and set it aside 2 Grab the thumbscrews and gently lift the internal system out of the enclosure It can rest on the edge of the enclosure NOTE Disconnecting the sensor connector plug from the sensor housing will allow for the complete removal of the internal system from the device enclosure Disconnecting the internal s...

Страница 16: ... the control board and complete the following see Figure 5 Connect the power GRAY wire to the VDC terminal Connect the ground BLACK wire to the VDC terminal Connect the signal GREEN wire to the 4 20 mA S terminal CAUTION If shielded cable is used leave the cable shield s drain wire disconnected and insulated at the T3A You will connect the opposite end of the cable s drain wire to the controller s...

Страница 17: ...screw the enclosure lid and pull the internal system out by the thumbscrews CAUTION Be sure power to the T3A is off before pulling out the internal system 2 Feed the RS 485 cable through the power hub and into the enclosure WARNING Use appropriate construction technique to maintain the explosion proof classification of the assembly 3 Connect the RS 485 B BROWN wire to the B terminal Table 3 T3A Te...

Страница 18: ...ough the power hub and into the controller and wire them to the correct terminals as shown below Figure 6 Modbus Wiring NOTE If an RKI controller is not used the T3A can be connected to a Programmable Logic Controller PLC for RS 485 Modbus data communications For integration and setup refer to the Modbus Register Map found in Appendix C of this manual ...

Страница 19: ...ARNING Use appropriate construction technique to maintain the explosion proof classification of the assembly 3 Connect the alarm device s power RED terminal to the NO or NC terminal on the relay terminal block NOTE It is recommended that the relay connections are wired as normally open NO However normally closed NC wiring configurations provide an inherent fail safe and may be preferred 4 Connect ...

Страница 20: ...20 T3A Transmitter 5 Connect the external power source s terminal GRAY to the COM terminal on the relay terminal block Figure 7 Relay Wiring ...

Страница 21: ...is provided to the power terminal block 1 If necessary unscrew the enclosure lid and pull the internal system out by the thumbscrews CAUTION Be sure power to the T3A is off before pulling out the internal system 2 Locate the power RED and ground BLACK wires on the alarming device WARNING Use appropriate construction technique to maintain the explosion proof classification of the assembly 3 Feed th...

Страница 22: ...the T3A function ONLY as thumb holds for ease in removal of the internal system from the base of the enclosure Do NOT attempt to loosen or tighten the thumbscrews when opening or closing the enclosure 3 Verify that the sealing ring seated at the threaded opening of the device enclosure is correctly in place 4 Secure the enclosure lid back onto the enclosure WARNING When securing the lid onto the d...

Страница 23: ... the power source 4 Verify that the controller is on and operating properly Refer to the controller operator s manual 5 The T3A automatically powers on and enters a 1 minute warmup period 6 At the end of the warmup the T3A is in Normal Operation 7 The T3A is factory calibrated before shipping from RKI If a full calibration is desired at startup see page 48 1 Measured gas concentration reading 2 Ga...

Страница 24: ...re lid tightly closed during operation Normal Operating Mode While in normal operating mode the T3A continuously samples the air and updates the measured concentration of the target gas on the display screen The display when in normal operation appears as shown below Reading above full scale 4 20 mA output is 25 mA 1 Measured gas concentration reading 2 Gas concentration unit of measure 3 Sensor e...

Страница 25: ...he startup sequence The directions below describe how to power off and power on the VOC Pro once power has been applied Powering Off Powering off the device stops the operation of the unit The Product Settings and Configuration as well as the operation settings including the zero and calibration of the sensor will be unaffected 1 Press and hold the SUB button for approximately 6 seconds until OFF ...

Страница 26: ... to deactivate latching alarm s NOTE The gas level reading MUST be below the alarm level setting before the alarm can be deactivated Press the MENU button ONLY once to deactivate the latching alarm s Pressing the MENU button more than once will activate and open the Operation Settings menu The alarms will NOT activate even in the presence of gas until you have exited the menu mode for approximatel...

Страница 27: ...e MENU button for approximately 6 seconds until the menu is activated and open on the display screen To access the Operation Settings menu from the normal operating screen press and release the MENU button once and the menu will open and show on the display NOTE After 5 minutes of no interaction with the device the unit will automatically return to normal operating mode ...

Страница 28: ...afe Setting see page 32 Relay 2 Fail Safe Setting see page 34 Fault Terminal Fail Safe Setting see page 34 Calibration Method see page 34 RS 485 Modbus Address Setting see page 35 RS 485 Modbus Baud Setting see page 36 4 20 mA Offset Settings Zero Offset Setting Full Scale Offset Setting see page 37 Display Screen Contrast Setting see page 38 Return to Factory Default Settings see page 39 Reset Ze...

Страница 29: ...st gas level reading can be increased or decreased in increments of 5 of the sensor scale up to 100 of the sensor scale 1 Enter the Product Settings and Configuration menu by pressing and holding the MENU button for 6 seconds The alarm test screen appears 2 Press the ADD button until the Alarm 1 and Alarm 2 levels are reached and the relay s are triggered to light all visual alarm s and sound all ...

Страница 30: ...creen allows the end user to view the following information The days since the sensor assembly was last zeroed The days since the sensor assembly was last calibrated The calibration number of the sensor used for diagnostic purposes This screen is for informational purposes only 1 If necessary enter the Product Settings and Configuration menu by pressing and holding the MENU button for 6 seconds 2 ...

Страница 31: ...gs Relay 1 and Relay 2 can be set to latching or auto resetting Relays set to auto resetting will automatically deactivate when the detected gas level falls below the corresponding alarm setting Conversely latching relays once activated MUST be manually reset at the device regardless of the change in gas detection level readings The factory default settings for Relay 1 and Relay 2 are auto resetti...

Страница 32: ...n Relay Fail Safe Setting From a safety perspective any unknown situation must be considered potentially hazardous When a stand alone gas detector is unable to detect gas an unknown condition is created and precautions must be taken to prevent personal injury or loss of life This means that the device must be able to alert the end user that it is no longer fully operational This safety function is...

Страница 33: ...nds 2 Press and release the MENU button until the Relay 1 Failsafe screen appears 3 Use the ADD and SUB buttons to select the desired fail safe setting for Relay 1 Select Yes to turn the fail safe setting on or select No to leave the fail safe setting off 4 Press the MENU button to select the desired setting and to advance to the Relay 2 fail safe setting screen Recommended Configurations for Rela...

Страница 34: ...ior is desired Fault Terminal Fail Safe Setting 1 If necessary enter the Product Settings and Configuration menu by pressing and holding the MENU button for 6 seconds 2 Press and release the MENU button until the Fault Terminal Failsafe screen appears 3 Use the ADD and SUB buttons to select the desired fail safe setting for the Fault Terminal Select Yes to turn the fail safe setting on or select N...

Страница 35: ...e server address in RS 485 networks Each server is assigned an address and listens for messages which contain this number in the Modbus address field The T3A uses the original Modbus RTU over the RS 485 link RS 485 Modbus has 255 addresses ranging from 1 to 255 Eight of the addresses are used for internal system settings leaving addresses 1 to 247 available for your device The RS 485 Modbus commun...

Страница 36: ...odbus device The T3A s default Modbus baud setting is 9600 bps The RS 485 Modbus communication parameters used in the T3A are 8 data bits no parity bit and 1 stop bit 8 N 1 these parameters are fixed and cannot be changed Some devices come with different Modbus baud rates Check with your system administrator to determine if a different Modbus baud setting is needed for your system The pre set Modb...

Страница 37: ...ntroller the 4 20 mA offset will need to be recalibrated The factory default settings on the T3A for the 4 20 mA offset are 4 00 mA for the zero offset and 20 00 mA for the full scale offset 1 If necessary enter the Product Settings and Configuration menu by pressing and holding the MENU button for 6 seconds 2 Press and release the MENU button until the 4 20 mA Offset screen appears 3 Press and re...

Страница 38: ... adjusted for optimum viewing The factory default setting on the T3A for the display screen contrast is 29 approximately 45 of the contrast scale The contrast setting ranges from 1 to 64 NOTE Setting the contrast too low will cause the display image to become faint or indistinguishable especially when the unit is located in areas with full sun The resulting field of view could be misinterpreted as...

Страница 39: ...System Information Zero Calibration Timer Cleared Unit Information Background Setting 4 Relay 1 Latching Auto Reset Auto Reset Relay 2 Latching Auto Reset Auto Reset Relay 1 Fail Safe Setting No Off Relay 2 Fail Safe Setting No Off Calibration Method Manual RS 485 Modbus Address Setting 1 RS 485 Modbus Baud Setting 9600 bps 4 20 mA Zero Offset Setting 4 00 mA 4 20 mA Full Scale Offset Setting 20 0...

Страница 40: ...rmal operating mode screen NOTE If the T3A is reset to the factory default settings ALL configuration steps MUST be repeated and the device MUST then be zeroed and calibrated for proper operation of the device Reset Zero Calibration Values Resetting the zero and calibration settings of the sensor element will allow the currently stored zero and calibration values to be rest without having to recon...

Страница 41: ...the Operation Settings menu Sensor Alarm Settings The T3A has two alarm settings Alarm 1 and Alarm 2 Regardless of whether the device includes the optional two dry contact relays the system alarm settings are available on the device All alarm set points are field adjustable up to 60 of the full scale gas concentration The factory default setting on the T3A for Alarm 1 is 10 of full scale and 15 of...

Страница 42: ...ecrease the Alarm 1 set point respectively 3 Press the MENU button to save the desired setting and to advance to the sensor Alarm 1 increasing decreasing setting screen Sensor Alarm 1 Increasing Decreasing Setting 1 From normal operating mode press and release MENU until the Alarm 1 increasing decreasing setting screen appears 2 Use the ADD and SUB buttons to select between activation on an Increa...

Страница 43: ...ibrations assuming no damage or potential damage has occurred to the sensor and that there has not been a power outage to the sensor assembly If damage has occurred or the power supplied to the sensor has changed a calibration should be completed immediately Scheduled maintenance should include the zero and calibration of the sensor see page 48 and an alarm test see page 29 The sensor head should ...

Страница 44: ...replace it if it has turned amber T3A Fault Codes Problem Cause s Solution s F1 Check Sensor Cable The control board has lost communication with the digital sensor interface adapter board 1 Check connection between the sensor housing connector header and the digital sensor interface adapter board plug in 2 Replace the sensor interface adapter board F4 Check Sensor Board The control board has lost ...

Страница 45: ...ned to be non hazardous Keep the sensor housing cap and enclosure lid tightly closed during operation CAUTION The internal components can be static sensitive Use caution when opening the enclosure and handling internal components DO NOT use any metal objects or tools to remove the sensing element from the sensor adapter board 1 Press and hold the SUB button for approximately 6 seconds until OFF sh...

Страница 46: ...ve the sensor housing cap or enclosure lid while the circuits are energized unless the area is determined to be non hazardous Keep the sensor housing cap and enclosure lid tightly closed during operation CAUTION The internal components can be static sensitive Use caution when opening the enclosure and handling internal components DO NOT use any metal objects or tools to remove the fuses 1 Disconne...

Страница 47: ... in the fuse holder 7 Push the new fuse into the fuse holder 8 Place the internal system back into the enclosure matching each mounting post to its corresponding eyelet anchored within the base of the enclosure 9 Using the thumbscrews gently push to seat the internal system into the mounting posts NOTE The thumbscrews on the VOC Pro function ONLY as thumb holds for ease in removal of the internal ...

Страница 48: ...ibrates every device at the factory for best accuracy the detector SHOULD be calibrated in the environment where it is installed Materials 0 5 LPM fixed flow regulator with knob calibration cup calibration tubing zero air cylinder if not in a fresh air environment calibration cylinder RKI recommends using 50 of the full scale value of your detected gas NOTE Use Cl2 to calibrate a ClO2 sensor The C...

Страница 49: ...t the regulator to the calibration cup e Turn the regulator knob counterclockwise to open the regulator f Allow the gas to flow for two minutes g Press the ADD button to select Yes and continue to Step 5 5 The unit will automatically begin the 6 second zero process During the zero the display will show a countdown of the time remaining until the process is complete NOTE The zero process cannot be ...

Страница 50: ...ct the regulator to the calibration cup 5 Turn the regulator knob counterclockwise to open the regulator 6 For all gases except Cl2 and ClO2 let the gas flow for 1 minute For Cl2 and ClO2 let the gas flow for 6 minutes 7 Use the ADD and SUB buttons to adjust the reading on the screen to match the concentration listed on the calibration cylinder For ClO2 sensors adjust the ClO2 reading to match the...

Страница 51: ...wish to continue to calibrate the sensor press the SUB button to select No to advance to the sensor radio address setting screen 3 Use the ADD and SUB buttons to adjust the concentration match the concentration shown on the calibration cylinder For ClO2 sensors adjust the ClO2 concentration to match the Cl2 concentration shown on the calibration cylinder There is no conversion factor 4 Press the M...

Страница 52: ... is complete NOTE Once the calibration countdown has started the process cannot be stopped without disconnecting the power from the unit 11 When calibration is complete remove the calibration cup from the sensor housing and reinstall the rain guard NOTE If the sensor responds extremely slow or does not respond to the applied gas it may indicate a failed sensor element The sensor element will need ...

Страница 53: ...ylinder 50 LEL methane in air 103 liter 81 0013RK 01 Calibration cylinder 50 volume methane in nitrogen 34 liter steel 81 0013RK 05 Calibration cylinder 50 volume methane in nitrogen 58 liter 81 0064RK 01 Calibration cylinder 50 ppm CO in air 34 liter steel 81 0064RK 03 Calibration cylinder 50 ppm CO in air 103 liter 81 0072RK 01 Calibration cylinder 2 5 CO2 in air 34 liter steel 81 0072RK 03 Cali...

Страница 54: ... liter aluminum 81 0190RK 02 Calibration cylinder 5 ppm Cl2 in nitrogen 58 liter 81 0190RK 04 Calibration cylinder 5 ppm Cl2 in nitrogen 34 liter aluminum 81 0194RK 02 Calibration cylinder 10 ppm HCl in nitrogen 58 liter 81 0196RK 02 Calibration cylinder 10 ppm HCN in nitrogen 58 liter 81 0196RK 04 Calibration cylinder 10 ppm HCN in nitrogen 34 liter aluminum 81 1050RK Regulator with gauge and kno...

Страница 55: ... receiving controller PLC to distinguish between a zero signal a broken wire or an unresponsive instrument Benefits of 4 20 mA convention are that it is an industry standard low cost to implement can reject some forms of electrical noise and the signal does not change value around the loop as opposed to voltage The key advantage of the current loop is that the accuracy of the signal is not affecte...

Страница 56: ...Range Electrochemical EC Hydrogen Sulfide H2S 0 100 ppm Electrochemical EC Hydrogen Sulfide High Range H2S2K 0 2000 ppm Electrochemical EC Sulfur Dioxide SO2 0 20 ppm Electrochemical EC Oxygen O2 0 25 Electrochemical EC Carbon Monoxide CO 0 1000 ppm Electrochemical EC Chlorine CL2 0 20 ppm Electrochemical EC Hydrogen Chloride HCL 0 30 ppm Electrochemical EC Ammonia NH3 0 100 ppm Electrochemical EC...

Страница 57: ...For the purposes of the T3A the term daisy chain refers to multiple devices connected in a series to form a single long line of devices connected via the wiring patterns embedded within each device Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of canceling out electromagnetic interference EMI from external sources as well...

Страница 58: ...odbus consult the following diagram The signal wire of each unit is run to the signal terminal of the neighboring sensor With each device connected to the previous device via the signal wire a chain is created with the first device in the chain directly connected to the controller Terminating resistor may be required for the last device in the daisy chain RS 485 Modbus Connection Distances for Ele...

Страница 59: ...of Sensor R 1 ENUM 0 7 see below 9 9 Voltage Reading R 2 FLOAT 12V 35V B 11 Fault Code R 1 ENUM 0 6 see below C 12 Sensor Type R 1 ENUM 0 4 see below E 14 Relay 1 Setting R 2 FLOAT 1 32000 10 16 Relay 2 Setting R 2 FLOAT 1 32000 16 22 Precision R 1 INT 0 3 17 23 Relay Setting R 1 BFLD See Relay Setting Table 18 24 Days Since Last Zero R 1 UINT 0 60000 60000 Default to Never 19 25 Calibration Type ...

Страница 60: ... Gas 7 VOC Volatile Organic Compounds 9 HCL Hydrogen Chloride 10 NH3 Ammonia 12 CLO2 Chlorine Dioxide 13 HCN Hydrogen Cyanide 14 F2 Fluorine 15 HF Hydrogen Fluoride 16 CH2O Formaldehyde 17 NO2 Nitrogen Dioxide 18 O3 Ozone 26 PH3 Phosphine 27 HBr Hydrogen Bromide 28 EtO Ethylene Oxide 29 CH3SH Methyl Mercaptan 30 AsH3 Arsine Response Unit Type 0 ppm 1 Response Sensor Mode 0 Normal Operating Mode 1 ...

Страница 61: ...r Response Sensor Type 0 EC Electrochemical 1 IR Infrared 2 CB Catalytic Bead 4 PID Photo Ionization Detector Bit Relay Setting Function 5 Relay 2 Increasing Decreasing Setting 0 Decreasing 1 Increasing 4 Relay 1 Increasing Decreasing Setting 0 Decreasing 1 Increasing 3 Relay 2 Failsafe Setting 0 No Off 1 Yes On 2 Relay 1 Failsafe Setting 0 No Off 1 Yes On 1 Relay 2 Latch Auto Reset 0 Auto Reset 1...

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