65-2335RK Carbon Monoxide Transmitter Operator’s Manual Part Number: 71-0177RK Revision: 0 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 CO Detector . . . . . . . . . . . . . . . . . . . . . . . .
Overview This instruction manual describes the 65-2335RK 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. Specifications Table 1 lists specifications for the CO transmitter.
Description This section describes the components of the CO transmitter. The CO transmitter is a 4 - 20 mA type detector head. It consists of the CO detector, amplifier, and junction box.
CO Detector The CO detector includes the detector housing body, detector housing, cap, cap gasket, plug-in sensor, and charcoal filter. Detector Housing Body Cap Gasket CO Plug-in Sensor Charcoal Filter w/Rubber Boot Detector Housing Cap Hydrophobic Membrane Figure 2: Oxygen 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 SPAN Z ERO Controller Housing J-Box Black CO Detector Red 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.
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 CAUTION: If you suspect the presence of the target gas in the monitoring environment, use the calibration kit and the zero air calibration cylinder to introduce “fresh air” to the sensor and verify an accurate zero setting.
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.
NOTE: If the readings are not within ± 10% 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. Unscrew the regulator from the calibration cylinder. 5. Unscrew the calibration cup from the CO detector. 6. Remove the voltmeter leads from the amplifier test points. 7. Reinstall the junction box cover. 8.
Table 2:Troubleshooting the CO Transmitter (cont.) Condition Slow or No Response/ Difficult or Unable to Calibrate Symptom(s) Probable Causes Recommended Action • Transmitter responds slowly or does not respond to response test. • Unable to accurately set the zero or response reading during calibration. • Transmitter requires frequent calibration. • The calibration cylinder is low, out-dated, or defective. • The calibration gas is not an appropriate concentration.
9. Turn on or plug in power to the controller. 10. Turn on the controller and place it into normal operation. CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step. 11. Calibrate the transmitter as described in “Calibration” on page 14. Replacing the Charcoal Filter 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Unscrew the detector housing cap from the detector housing body. 4.
10. Turn on or plug in power to the controller. 11. Turn on the controller and place it into normal operation. CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 12. Calibrate the replacement detector as described in “Calibration” on page 14. 13. Secure the junction box cover to the junction box. Replacing the Amplifier 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Remove the junction box cover. 4.
then more frequent calibration than every 3 months may be necessary. 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. It describes the test using a calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.
3. Allow the gas to flow for two minutes, then verify that the reading matches the response reading (± 2mV) you determined earlier. If necessary, use the span pot on the amplifier to adjust the reading to match the correct response reading. 4. Turn the regulator knob clockwise to close the regulator. 5. Unscrew the regulator from the calibration cylinder. Returning to Normal Operation 1. Remove the voltmeter leads from the amplifier test points. 2. Unscrew the calibration cup from the detector.
