65-2322RKSS Oxygen Transmitter Operator’s Manual Part Number: 71-0299RK Revision: A Released: 7/6/20 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Oxygen Detector . . . . . . . . . . . . . . . . . . .
Overview This instruction manual describes the explosion proof capillary type oxygen transmitter 65-2322RKSS. 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 oxygen transmitter. See the controller operator’s manual for information specific to the controller.
Description This section describes the components of the oxygen transmitter. The oxygen transmitter is a 4 - 20 mA type detector head. It consists of the oxygen detector, amplifier, and junction box.
Oxygen Detector The oxygen detector consists of the detector housing body, detector housing cap, cap gasket, and the plug-in sensor. Detector Housing Body Cap Gasket Plug-in Oxygen Sensor Detector Housing Cap Flame Arrestor Guard Figure 2: Oxygen Detector Component Location Detector Housing Body The detector housing body protects the electronic components within the housing.
the detection range of the transmitter. 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. A foam gasket that orients the amplifier and keeps it from rotating is installed on the bottom of the amplifier. The amplifier includes the controller terminal strip, detector terminal strip, zero pot, span pot, and test points (see Figure 1).
Junction Box The stainless steel, corrosion resistant junction box allows you to install the detector at a mounting site that is remote from a controller, and it protects the amplifier and wiring connections made to the amplifier. Two conduit hubs allow you to mount the detector to the junction box and connect the wiring from the detector to a controller. An O-ring seals the interface between the junction box cover and the junction box base. The amplifier is factory installed in the junction box.
3.66 3.34 3.15 3/4 NPT Female, 2X 2.40 .20 Dia. x .45 Slot, 2X 8.25 max J-Box Oxygen Detector 1.10 Figure 3: Mounting the Oxygen Transmitter 2. At the monitoring site you select, hang or mount the junction box with the detector facing down (see Figure 3).
Wiring the Oxygen Transmitter to a Controller WARNING: If the controller’s construction is not explosion-proof, the controller must be installed in an ordinary location. Do non install a non-explosion-proof controller in a classified location. 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.
11. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in Figure 4.
Start Up This section describes procedures to start up the oxygen 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. Refer to the controller operator’s manual.
8. Allow the gas to flow for two minutes. 9. Verify a voltmeter reading of 434 mV (±2 mV). 10. If necessary, use a small flat-blade screwdriver to adjust the span pot until the voltmeter reading is 434 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 zero air calibration cylinder. For convenience, leave the sample tubing connected to the regulator and the calibration cup. 14.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the oxygen 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 Oxygen Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
Replacing Components of the Oxygen Transmitter This section includes a procedure to replace the plug-in oxygen sensor, a procedure to replace the entire oxygen detector assembly, and one to replace the amplifier. In most cases, it is not necessary to replace the entire detector assembly. Replacing The Plug-in Oxygen Sensor CAUTION: The plug-in sensor contains electrolyte that is an irritant. Do not disassemble the sensor when replacing it with a new one.
7. Guide the detector leads of the replacement detector through the bottom conduit hub 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 appropriate detector terminal strip terminals. Connect the white wire to the terminal labelled Oxy + and the green wire to the terminal labelled Oxy -.
11. Allow the transmitter to warm-up for 5 minutes. 12. Calibrate the transmitter as described in “Calibration” on page 18 of this manual. Calibration Frequency Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 3 months is adequate for most oxygen transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the controller into its calibration program or disable external alarms before continuing. 6. Screw the calibration cup onto the detector housing cap. Setting the Fresh Air Reading NOTE: If you can verify that the oxygen transmitter is in a fresh air environment, you do not need to apply zero air to the detector before adjusting the fresh air 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 junction box cover to the junction box. 3. When the controller display reading rises above the decreasing alarm setpoint, return the controller to normal operation. NOTE: If you do not allow the gas reading to increase above the decreasing alarm point, then unwanted alarms may occur. 4. Verify that the controller display reading increases and stabilizes at 20.9% volume. 5.
Parts List Table 3 lists replacement parts and accessories for the oxygen transmitter.
