65-2432RK Carbon Monoxide Transmitter Operator’s Manual Part Number: 71-0070RK Revision: P1 Released: July 8, 2001 RKI Instruments, Inc.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CO Detector . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the carbon monoxide (CO) transmitter. This manual also describes how to install, start up, maintain, and calibrate the transmitter. A parts list at the end of this manual lists replacement parts and accessories for the CO transmitter. Specifications Table 1 lists specifications for the CO transmitter.
Description This section describes the components of the CO transmitter. The transmitter consists of the CO detector, amplifier, and junction box.
Charcoal Filter The disc-shaped charcoal filter is secured to face of the CO sensor with a rubber boot. The charcoal filter prevents interference gases (hydrogen sulfide [H2S] and certain hydrocarbons) from producing false CO readings. Amplifier The amplifier converts the electrical output from the sensor to a 4 to 20 mA signal (that is proportional to the detection range) and transmits the signal to a gas monitoring controller.
Junction Box Use the junction box to install the CO 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). NOTE: The CO detector and amplifier are factory-mounted to the junction box.
If the CO detector is mounted to the junction box, skip to step 5. If not, continue with step 2. 2. Remove the junction box cover. 3. Guide the two wires that extend from the top of the CO detector through the bottom conduit hub of the junction box. 4. Screw the CO detector into the bottom conduit hub of the junction box. 5. At the monitoring site, use #10 screws through the junction box’s two mounting holes to secure the junction box to a vertical surface.
10. Connect the wires to the to the applicable controller transmitter terminal strip as shown in Figure 3. Not Used Factory Set Pot. Toxics Amplifier FB BATT 4/20 24V TOXIC OXY ZERO + 24 VDC SPAN OXY TOXIC RD BK W G 4 - 20 mA In (FB) Jumper Block Installed To Toxic Select Header Black Controller or Recording Device Red C O Detector, Factory Wired Figure 3: Wiring the CO Transmitter to a Controller 11. Connect the cable’s drain to an available chassis ground at the controller.
Start Up This section describes procedures to start up the CO 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 instruction manual. 3. Turn on or plug in the incoming power at the power source end, then turn on the controller. 4. Verify that the controller is on and operating properly.
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 CO transmitter. It includes daily, monthly, and quarterly procedures. Daily 1. Verify a display reading of 0 PPM CO at the controller. Investigate significant changes in the display reading.
Performing the response test 1. Screw the regulator into the calibration cylinder. The sample will begin to flow 2. Allow the gas to flow for two minutes, then verify that the reading is within ± 10% of the response reading you determined earlier. NOTE: If the readings are not within ± 10% of the correct response reading, calibrate the affected transmitter(s) as described in the Calibration section of this manual. 3. Unscrew the regulator from the calibration cylinder. 4.
• Unable to accurately set the zero or response reading during the calibration procedure. • The transmitter requires frequent calibration. NOTE: Under “normal” circumstances, the transmitter requires calibration once every three months. Some applications may require a more frequent calibration schedule. Probable causes • The calibration cylinder is low, out-dated, or defective. • The transmitter is malfunctioning. Recommended action 1.
Replacing the charcoal filter 1. Turn off the controller. 2. Turn off or unplug incoming power at the power source end. 3. Unscrew the bottom section of the CO detector housing from the top section. 4. Unplug and remove the CO sensor with the boot and charcoal filter attached 5. Remove the rubber boot that secures the charcoal filter to the CO sensor. 6. Remove the charcoal filter from the rubber boot. 7.
11. Reconnect the detector leads to the detector terminal strip as shown in Table 3 and Figure 3, Wiring the CO Transmitter to a Controller. Table 3: Reconnecting the CO Detector to the Amplifier CO Detector Lead Amplifier Interconnect Terminal Strip Black TOXIC BK Red TOXIC RD 12. Reinstall the junction box cover. 13. Turn on or plug in incoming power at the power source end. 14. Turn on the controller. CAUTION: Allow the sensor to warm up for 5 minutes before you continue with the next step. 15.
CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 11. Calibrate the replacement detector as described in the Calibration section of this manual. 12. Secure the junction box cover to the junction box. Calibration This section describes how to calibrate the CO transmitter. It includes procedures to prepare for calibration, set the zero reading, set the response reading, and return to normal operation.
mV (± 2mV). 3. 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. Gas will begin to flow. 2. Allow the gas to flow for two minutes, then verify that the reading matches the response reading (± 2mV) you determined earlier.
Parts List Table 5 lists replacement parts and accessories for the CO transmitter.
