65-2397RK CO2 Transmitter Operator’s Manual Part Number: 71-0185RK Revision: B Released: 7/18/14 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 CO2 Detector . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2397RK CO2 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 CO2 transmitter. Specifications Table 1 lists specifications for the CO2 transmitter.
Description This section describes the components of the CO2 transmitter. The transmitter is a 4 - 20 mA type detector head. It consists of the CO2 detector, amplifier, and junction box.
Detector Housing Body Cap Gasket Plug-In CO2 Sensor Sensor Retainer Detector Housing Cap Hydrophobic Membrane Figure 2: CO2 Detector Component Location Detector Housing Body The detector housing body protects the electronic components within the housing. Use the mounting threads at the top of the housing to screw the CO2 detector into the 3/4” NPT hub on the bottom of the junction box. Four color coded leads, red, white, green, and black, extend from the other end of the detector.
bottom of the amplifier. The amplifier includes the controller terminal strip, detector terminal strip, span pot, zero pot, and test points (see Figure 1). Controller Terminal Strip The controller terminal strip is a three position plug-in style terminal strip located near the top of the amplifier. Use the controller terminal strip to wire the CO2 transmitter to a controller.
Installation This section describes procedures to mount the CO2 transmitter in the monitoring environment and wire the transmitter to a controller. Mounting the CO2 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 CO2 Transmitter to a Controller WARNING: Always verify that the power to the controller is off before you make wiring connections. 1. Turn off the controller. 2. Turn off or unplug 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.
+ 24 VDC 4 - 20 mA In (S) - (DC Ground) Cable sheild Controller Amplifier S S IG/ PWR Green Detector Wires White W G LEL B S PAN ZER O Black R Red J-Box IR CO2 Detector Figure 4: Wiring the CO2 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.
Start Up This section describes procedures to start up the CO2 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 power to the controller. 4. Turn on the controller. 5. Verify that the controller is on and operating properly.
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow. 8. Allow the gas to flow for one minute. 9. Verify a voltmeter reading of 100 mV (±2 mV). 10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 100 mV (±2 mV). 11. Turn the regulator’s on/off knob clockwise to close it. 12. Unscrew the calibration cup from the detector. 13. Unscrew the regulator from the 100% nitrogen calibration cylinder.
Preparing for the response test 1. Place the controller into its calibration mode or disable external alarms. 2. Verify that the controller display reading for the channel you are testing is consistent with typical background levels of CO2. If the display reading is not consistent with typical background levels of CO2, set the zero reading of the transmitter as described in “Start Up” on page 8 of this manual, then continue this procedure. 3. Screw the regulator into the calibration cylinder. 4.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the CO2 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 CO2 Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
Replacing Components of the CO2 Transmitter This section includes a procedure to replace the hydrophobic membrane, a procedure to replace the plug-in IR CO2 sensor, a procedure to replace the entire CO2 detector assembly, and one to replace the amplifier. In most cases, it is not necessary to replace the entire detector assembly. Replacing the Hydrophobic Membrane 1. Turn off the controller. 2. Turn off or unplug incoming power to the controller. 3.
NOTE: When first powered up, the transmitter will enter about a one minute period when the 4-20 mA output is stabilizing and may be above the controller alarm points or well below zero momentarily. RKI controllers have a one minute warmup period when the controller does not display any gas reading or give any alarm indication. The CO2 transmitter’s 4-20 mA signal should be stable by the time the controller’s warmup period is over.
NOTE: When first powered up, the transmitter will enter about a one minute period when the 4-20 mA output is stabilizing and may be above the controller alarm points or well below zero momentarily. RKI controllers have a one minute warmup period when the controller does not display any gas reading or give any alarm indication. The CO2 transmitter’s 4-20 mA signal should be stable by the time the controller’s warmup period is over.
Table 5:Reconnecting the CO2 Detector to the Amplifier Amplifier Detector Terminal Strip Detector Lead DETECTOR “W” WHT DETECTOR “G” GREEN DETECTOR “B” BLK 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 power to the controller. 11. Turn on the controller and place it into normal operation.
Calibration This section describes how to calibrate the CO2 transmitter. It includes procedures to prepare for calibration, set the zero reading, set the response reading, and return to normal operation. WARNING: The controller is not an active gas monitoring device during the calibration procedure. NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder, a 100% nitrogen cylinder, a 0.
6. Unscrew the regulator from the zero air calibration cylinder. 7. 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 calibration gas is representative of the transmitter’s target gas. 2. Turn the regulator’s on/off knob counterclockwise to open the regulator. 3.
Parts List Table 6 lists replacement parts and accessories for the CO2 transmitter. Table 6:Parts List Part Number Description 06-1248RK Sample tubing (3/16 in. x 5/16 in.
