65-2400RK Combustible Gas Transmitter Operator’s Manual Part Number: 71-0060RK Revision: C Released: 1/31/13 www.rkiinstruments.
WARNING Read and understand this instruction manual before operating detector. Improper use of the detector could result in bodily harm or death. Periodic calibration 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.
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 65-2400RK 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 This section describes the components of the combustible gas transmitter. The transmitter is a 4 - 20 mA type detector head. It consists of the combustible gas detector, amplifier, and junction box.
Detector Housing The sensing elements and flame arrestor are installed within the detector housing. Mounting threads (1/2 in. NPT) at the top of the detector allow you to mount the combustible gas detector into the bottom conduit hub of the junction box. A rainshield screws onto the bottom of the detector. The rainshield helps protect the detector from debris in the monitoring environment. Detector Leads Four color-coded leads extend from the top of the detector.
Junction Box Use the junction box to install the combustible gas transmitter at a mounting site that is remote from the controller. The junction box also protects the amplifier and wiring connections made to the amplifier. Use the two 3/4 in. conduit hubs to mount the detector to the junction box (bottom hub) and connect wiring from the amplifier to the controller (top hub). The detector has 1/2 in. NPT mounting threads, so a 3/4 in NPT. x 1/2 in. NPT reducer is used to mount it.
Installation This section describes procedures to mount the combustible gas transmitter in the monitoring environment and wire the transmitter to the controller. Mounting the Combustible Gas Transmitter 1. Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site. • Select a site where the transmitter is not likely to be bumped or disturbed.
Wiring the Combustible Gas Transmitter to a Controller WARNING: Always verify that the power source is off before you make wiring connections. 1. Turn off power to the controller. 2. Place the controller’s power switch in the OFF position. 3. Remove the junction box cover. 4. Verify that the detector leads are wired to the amplifier’s interconnect terminal strip. If necessary, connect the detector leads to the interconnect terminal strip as shown in Figure 3. 5.
- (DC -) + 24 VDC 4 - 20 mA In (FB or S) TP+ POWER/SIG Cable Shield GND Controller Transmitter Terminals,Typical 24V 4-20 SENSOR RED WHT GRN BLK Black Green White Red TP- Figure 3: Wiring the Combustible Gas Transmitter to a Controller 10. If shielded cable is used, connect the cable’s drain wire to an available chassis 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 or plug in power to the controller, then place the controller’s power switch in the ON position. 4.
Maintenance This section describes maintenance procedures. It includes preventive maintenance, troubleshooting, and component replacement procedures. Preventive Maintenance This section describes a preventive maintenance schedule to ensure the optimum performance of the combustible gas transmitter. It includes daily, monthly, and quarterly procedures. Daily Verify a display reading of 0%LEL at the controller. Investigate significant changes in the display reading.
begin to flow. 2. Allow the gas to flow for two minutes, then verify that the reading is within ± 20% of the response reading you determined earlier. NOTE: If the reading is not within ± 20% of the correct response reading, calibrate the transmitter as described in “Calibration” on page 14 of this manual. 3. Turn the regulator’s on/off knob clockwise to close it. 4. Unscrew the regulator from the calibration cylinder. 5. Unscrew the calibration cup from the detector. 6.
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.
Replacing Components of the Combustible Gas Transmitter This section includes procedures to replace the combustible gas detector and amplifier. Replacing the Combustible Gas Detector 1. Turn off power to the controller. 2. Place the controller’s power switch in the OFF position. 3. Remove the junction box cover. 4. Disconnect the detector leads from the interconnect terminal strip. Note the position of the color-coded leads as you remove them. 5. Unscrew the detector from the junction box. 6.
8. Place the new amplifier in the same position as the amplifier you removed in the previous step. 9. Use the two screws you removed in step 5 to secure the amplifier to the junction box. 10. Reconnect the wiring that connects the controller to the combustible gas transmitter at the amplifier’s interconnect terminal strip as shown in Table 4 below and Figure 3 on page 7 of this manual.
adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate. If an application is very demanding, for example if combustible gas is present often and in significant concentrations or the environment is not well controlled, then more frequent calibration than every 3 months may be necessary. If potential catalyst poisons are known or likely to be present, more frequent calibration than every 3 months will be necessary.
4. If necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (±2 mV). 5. Turn the regulator’s on/off knob clockwise to close it. 6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing connected to the regulator and the calibration cup. Setting the Response Reading 1. Screw the regulator into the calibration cylinder. Verify that the calibrating gas is representative of the transmitter’s target gas. 2.
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.; specify length when ordering) 18-0001RK Reducer, 3/4 in. NPT x 1/2 in.
