65-2336RK Carbon Monoxide Transmitter Operator’s Manual Part Number: 71-0178RK Revision: 0 Released: 2/11/11 RKI Instruments, Inc. 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 CO Detector . . . . . . . . . . . . . . . . . . . . . . . .
Overview This instruction manual describes the 65-2336RK carbon monoxide (CO) transmitter. This manual also describes how to install, start up, configure, maintain, and calibrate the transmitter when using it with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and accessories for the CO transmitter. See the controller operator’s manual for information specific to the controller.
Description This section describes the components of the CO transmitter. The CO transmitter is a 4 to 20 mA type detector head. It consists of the CO detector, amplifier, and junction box.
CO Detector The CO detector consists of the detector housing body, detector housing cap, cap gasket, plug-in sensor, and the charcoal filter. Detector Housing Body Cap Gasket Plug-In CO Sensor Rubber Boot With Charcoal Filter Detector Housing Cap Flame Arrestor Guard Figure 2: CO Detector Component Location Detector Housing Body The detector housing body protects the electronic components within the housing.
Charcoal Filter The disc-shaped charcoal filter is secured to the 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 detector to a 4 to 20 mA signal that corresponds to the detection range and transmits the signal to a gas monitoring controller.
Junction Box Use the junction box to install the transmitter at a mounting site that is remote from the controller. The junction box protects the amplifier and wiring connections made to the amplifier. Use the top 3/4’’ conduit hub to connect wiring from the amplifier to the controller. Use the cover on the front of the junction box to access the interior of the junction box. The detector and amplifier are factory installed in the junction box.
2. At the monitoring site you select, hang or mount the junction box with the detector facing down (see Figure 3). Wiring the CO Transmitter to a Controller WARNING: Always verify that power to the controller is off before you make wiring connections. 1. Turn off the controller. 2. Turn off power to the controller. 3. Remove the junction box cover. 4. The detector leads are factory wired. Verify that the detector leads are wired to the amplifier’s detector terminal strip as shown in Figure 4. 5.
Controller Detector/Transmitter Terminals, Typical Designations S + Cable Shield S SIG/ PWR TOXIC OXY S PAN ZER O Controller Housing J-Box Black Red CO Detector Figure 4: Wiring the CO 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.
5. Verify that the controller is on and operating properly. Refer to the controller operator’s manual. CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next section, “Setting the Zero Signal”. Setting the Zero Signal WARNING: Do not remove the detector housing cap or junction box cover while the circuits are energized unless the area is determined to be non-hazardous. Keep the detector housing cap and junction box cover tightly closed during operation.
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 Verify a display reading of 0 PPM CO at the controller. Investigate significant changes in the display reading.
Performing the response test 1. Turn the regulator’s on/off knob counterclockwise to open the regulator. Gas will 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 readings are not within ± 20% of the correct response reading, calibrate the affected transmitter(s) as described in “Calibration” on page 14. 3. Turn the regulator’s on/off knob clockwise to close the regulator. 4.
. Table 2:Troubleshooting the CO Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition Controller indicates a fail condition. • The transmitter wiring to the controller is disconnected or misconnected. • The plug-in sensor is not properly plugged into the sockets in the detector housing body. • The wiring from the detector to the amplifier is disconnected or misconnected. • The transmitter’s zero reading is low enough to cause a fail condition.
Replacing Components of the CO Transmitter This section includes a procedure to replace the CO plug-in sensor, charcoal filter, and amplifier. A procedure to replace the entire detector assembly is at the end of this section. In most cases, it is not necessary to replace the entire detector assembly. Replacing the Plug-In CO sensor CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor when replacing it with a new one.
12. Turn on the controller and place into normal operation. Replacing the CO Detector NOTE: In most cases, it is only necessary to replace the plug-in CO sensor. 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Remove the junction box cover. 4. Remove the detector terminal strip from its socket. 5. Disconnect the detector leads from the detector terminal strip. Note the position of the color-coded leads as you remove them. 6.
amplifier as shown in Figure 4. If controller leads or detector leads were removed during this procedure, refer to Figure 4 for the detector and amplifier connections. NOTE: When a transmitter is first powered up with a new amplifier, the initial output may be either high or below zero depending on the setting of the zero pot. Be sure to make arrangements so that this does not cause unwanted alarms. 10. Turn on or plug in power to the controller. 11.
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 5. Screw the calibration cup onto the detector housing. Setting the Zero Reading NOTE If you can verify that the CO transmitter is in a fresh air environment, you do not need to apply zero air to the detector before adjusting the zero reading. 1.
Parts List Table 3 lists replacement parts and accessories for the CO transmitter.
