65-2434RK Carbon Monoxide Transmitter Operator’s Manual Part Number: 71-0061RK Revision: D Released: 2/16/11 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. warranties 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 CO Sensor . . . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2434RK 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 sensor, charcoal filter, amplifier printed circuit board (PCB), and enclosure.
Interconnect Terminal Strip The interconnect terminal strip is the four-point terminal strip on the lower left side of the amplifier PCB. Use the interconnect terminal strip to connect the transmitter to a controller. Sensor Sockets There are four sensor sockets located in a circular pattern near the top of the amplifier PCB. The sensor plugs into these sockets. Span Pot The span pot is near the bottom right corner of the amplifier PCB.
Installation This section describes procedures to mount the CO transmitter in the monitoring environment and wire the transmitter to a gas monitoring controller. Mounting the CO 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. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
Wiring the CO Transmitter to a Controller WARNING: Always verify that the power source is off before you make wiring connections. 1. Turn off the controller. 2. Turn off or unplug incoming power at the power source end. 3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner. 4. Guide a two-conductor, shielded cable through the cable bushing at the bottom of the enclosure. 5. Connect the two wires to the interconnect terminal strip as follows (see Figure 3.
9. Connect the cable’s drain 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 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.
10. If necessary, use a flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 100 mV (±2 mV). 11. Turn the regulator on/off knob clockwise to close it. 12. Remove the calibration cup from the sensor face. 13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave the sample tubing connected to the regulator and the calibration cup. 14. Store the components of the calibration kit in a safe and convenient place. 15.
300 PPM, the correct output is 167 mV. 167 (mV) = (50/300) X 400 +100 Performing the response test 1. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow. 2. Hold the calibration cup against the CO sensor’s face. Leave the rubber boot and charcoal filter on the sensor when calibrating. Hold the cup on gently to allow gas to escape and avoid pressurizing the sensor’s sensing face. 3.
Symptoms • The transmitter responds slowly or does not respond during the monthly response test. • 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.
Replacing the Amplifier PCB 1. Turn off the controller. 2. Turn off or unplug incoming power to the controller. 3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner. 4. Disconnect the wires from the interconnect terminal strip. 5. Unplug the CO sensor from the amplifier PCB to access one of the PCB mounting screws. 6. Unscrew and remove the two screws that secure the amplifier PCB to the enclosure. The screws are near the top and bottom of the amplifier PCB. 7.
6. Remove the charcoal filter from the rubber boot. 7. Place the replacement filter in the rubber boot in the same position as the filter you removed in the previous step. 8. Reinstall the rubber boot with charcoal filter to the CO sensor. 9. Carefully plug the CO sensor with rubber boot and charcoal filter into the socket pattern on the amplifier PCB. NOTE: Match the sensor’s male pins with the four female sockets as you plug the sensor into the sockets. 10. Secure the cover to the enclosure. 11.
3. Use the following formula to determine the correct test points output for the calibrating sample. Output (mV) = (calibrating sample/fullscale) X 400 + 100 For example, with a calibrating sample of 50 PPM CO and a fullscale setting of 300 PPM, the correct output is 167 mV. 167 (mV) = (50/300) X 400 +100 4. Place the controller into its calibration program or disable external alarms. Setting the Zero Reading 1. Screw the regulator into the zero air calibration cylinder. 2.
Returning to Normal Operation 1. Remove the voltmeter leads from the amplifier test points. 2. Secure the cover to the enclosure. 3. When the display reading falls below the alarm setpoints, return the controller to normal operation. 4. Verify that the controller display reading decreases and stabilizes at 0 ppm CO. 5. Store the components of the calibration kit in a safe and convenient place. Parts List Table 6 lists replacement parts and accessories for the CO channel.
