65-2396RK CO2 Transmitter Operator’s Manual Part Number: 71-0184RK 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 65-2396RK 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.
To distinguish the different ranges of CO2 detectors from one another, a short length of shrink tubing is applied to the wiring where it comes out of the nipple. The following table indicates the color of the shrink tubing and the color of the wire to which it is applied.
CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not adjust them. Test Points The test points are on the left side of the amplifier (see Figure 1). The test points produce a 100 mV to 500 mV output that corresponds to the transmitter’s 4 to 20 mA output. Use the test points and a voltmeter to measure the amplifier’s output during the start-up and calibration procedures.
2.70 .38 3/4 NPT Female 3.65 7.10 MAX Rubber Spacers, 3X J-Box IR CO2 Detector .75 Figure 2: Mounting the CO2 Transmitter 2. At the monitoring site you select, hang or mount the junction box with the detector facing down (see Figure 2). 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.
6. Guide a three-conductor, shielded cable, or three wires in conduit through the top conduit hub of the junction box. 7. Pull out the controller terminal strip, and connect the three wires to the terminal strip as follows (see Figure 3). • Connect the positive wire to the PWR/SIG “+” terminal. • Connect the signal wire to the PWR/SIG “S” terminal. • Connect the negative wire to the PWR/SIG “-” terminal.
+ 24 VDC 4 - 20 mA In (S) - (DC Ground) Cable Shield J-Box Controller S R W LEL G B PW R / SI G Amplifier Black Green White Red Detector Wires IR CO2 Detector Figure 3: 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 3:Troubleshooting the CO2 Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
of the junction box, then screw the mounting threads of the detector into the conduit hub. If necessary for environmental conditions, apply thread sealant or teflon tape to the hub and/or detector threads to seal them. 8. Connect the detector leads to the detector terminal strip as shown in Table 4 below and Figure 3 on page 7 of this manual. Table 4:Reconnecting the CO2 Detector to the Amplifier 9.
washer you removed in Step 5 above. 9. Install the detector and controller terminals strips into their sockets on the new amplifier as shown in Figure 3 on page 7 of this manual. If controller leads or detector leads were removed during this procedure, refer to Table 5 and Table 6 below.
Calibration Frequency Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 6 months is adequate for most infrared CO2 transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 6 months.
Setting the Zero Reading Since there is a background of CO2 in air of typically 300 - 600 ppm (0.03 - 0.06 %volume), it is necessary to use a calibration kit with a 100% nitrogen cylinder to set the zero signal of a CO2 transmitter with a low range detector. Fresh air can be used to zero the transmitter if a 0-50 %volume or 0-100 %volume detector is being used. 1. Screw the regulator into the 100% nitrogen calibration cylinder. 2.
Parts List Table 7 lists replacement parts and accessories for the CO2 transmitter. Table 7:Parts List Part Number Description 06-1248RK Sample tubing (3/16 in. x 5/16 in.
