65-2394RK Combustible Gas Transmitter Operator’s Manual Part Number: 71-0181RK Revision: A Released: 4/12/11 RKI Instruments, Inc. www.rkiinstruments.
WARNING Read and understand this instruction manual before operating transmitter. Improper use of the transmitter could result in bodily harm or death. Periodic calibration and maintenance of the transmitter is essential for proper operation and correct readings. Please calibrate and maintain this transmitter regularly! Frequency of calibration depends upon the type of use you have and the sensor types.
Product Warranty RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.
Table of Contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Combustible Gas Detector. . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2394RK combustible gas transmitter. This manual also describes how to install, start up, configure, maintain, and calibrate the transmitter when it is used with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and accessories for the combustible gas transmitter. Specifications Table 1 lists specifications for the combustible gas transmitter.
Description The 65-2394RK combustible gas transmitter has two versions, the 65-2394RK-CH4 which is calibrated to methane and the 65-2394RK-HC which is calibrated to propane. The transmitter utilizes an infrared type of detector which has some advantages over a catalytic type of combustible detector.
wrench. A porous flame arrestor that is coated with a hydrophobic film that repels liquids is on one end of the detector and allows sample gas to enter the detector. Four color coded leads, red, white, green, and black, extend from the other end of the detector. The leads allow you to connect the detector to the amplifier.
Test Points The test points are on the left side of the amplifier (see Figure 1). The test points produce a 100 mV to 500 mV output that corresponds to the transmitter’s 4 to 20 mA output. Use the test points and a voltmeter to measure the amplifier’s output during the start-up and calibration procedures. The black test point in the lower left corner is the negative (-) test point and the red test point below the zero pot is the positive (+) test point.
3/4 NPT Female 2.70 .38 3.65 7.10 MAX Rubber Spacer, 3X J-Box IR LEL Detector .75 Figure 2: Mounting the Combustible Gas Transmitter 2. At the monitoring site you select, hang or mount the junction box with the detector facing down (see Figure 2). Wiring the Combustible Gas Transmitter to a Controller WARNING: Always verify that the power to the controller is off before you make wiring connections. 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3.
6. Guide a three-conductor, shielded cable, or three wires in conduit through the top conduit hub of the junction box. 7. Pull out the controller terminal strip, and connect the three wires to the terminal strip as follows (see Figure 3). • Connect the positive wire to the PWR/SIG “+” terminal. • Connect the signal wire to the PWR/SIG “S” terminal. • Connect the negative wire to the PWR/SIG “-” terminal.
+ 24 VDC 4 - 20 mA In (S) - (DC Ground) Cable Shield Controller or Recording Device J-Box S R W G LEL B PW R / SI G Amplifier (Transmitter) Black Green White Red Detector Wires IR LEL Detector Figure 3: Wiring the Combustible Gas Transmitter to a Controller 12. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth) ground at the controller. RKI controllers typically have a ground stud that can be used to ground the cable’s drain wire.
Start Up This section describes procedures to start up the combustible gas transmitter and place the transmitter into normal operation. Introducing Incoming Power 1. Complete the installation procedures described earlier in this manual. 2. Verify that the power wiring to the controller is correct and secure. Refer to the controller operator’s manual. 3. Turn on power to the controller. 4. Turn on the controller. 5. Verify that the controller is on and operating properly.
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow. 8. Allow the gas to flow for one minute. 9. Verify a voltmeter reading of 100 mV (±2 mV). 10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 100 mV (±2 mV). 11. Turn the regulator’s on/off knob clockwise to close it. 12. Unscrew the calibration cup from the detector. 13. Unscrew the regulator from the zero air calibration cylinder.
If the display reading is not 0 %LEL, set the zero reading of the transmitter as described in “Start Up” on page 8, then continue this procedure. 3. Screw the regulator into the calibration cylinder. 4. Screw the calibration cup onto the bottom of the detector. 5. Use the calibration kit sample tubing to connect the regulator to the calibration cup. 6. Set a voltmeter to measure in the millivolt (mV) range. 7. Plug the voltmeter leads into the test points on the amplifier.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the combustible gas transmitter. NOTE: This troubleshooting guide describes transmitter problems only. See the controller operator’s manual for problems you may encounter with the controller. Table 2:Troubleshooting the Combustible Gas Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
hub. If necessary for environmental conditions, apply thread sealant or teflon tape to the hub and/or detector threads to seal them. 8. Connect the detector leads to the detector terminal strip as shown in Table 3 below and Figure 3 on page 7 of this manual. Table 3:Reconnecting the Combustible Gas Detector to the Amplifier 9. Detector Lead Detector Terminal Strip Red LEL “R” White LEL “W” Green LEL “G” Black LEL “B” Reinstall the detector terminal strip into its socket. 10.
9. Install the detector and controller terminals strips into their sockets on the new amplifier as shown in Figure 3 on page 7 of this manual. If controller leads or detector leads were removed during this procedure, refer to Table 4 and Table 5 below.
Calibration Frequency Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 6 months is adequate for most infrared combustible gas transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 6 months.
Setting the Zero Reading NOTE: If you can verify that the combustible gas transmitter is in a fresh air environment, you do not need to apply zero air to the detector before adjusting the zero reading. 1. Screw the regulator into the zero air calibration cylinder. 2. Use the calibration kit sample tubing to connect the regulator to the calibration cup. 3. Turn the regulator’s on/off knob counterclockwise to open the regulator. 4.
Parts List Table 6 lists replacement parts and accessories for the combustible gas transmitter. Table 6:Parts List Part Number Description 06-1248RK Sample tubing (3/16 in. x 5/16 in.
