65-2494RK/65-2497RK Oxygen Detector Operator’s Manual Part Number: 71-0179RK Revision: 0 Released: 2/16/11 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 65-2494RK Oxygen Detector . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2497RK oxygen detector. This manual also describes how to install, start up, maintain, and calibrate the oxygen detector when used with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and accessories for the oxygen detector. The 65-2497RK oxygen detector includes the 65-2494RK oxygen detector and a junction box.
Description This section describes the components of the 65-2494RK and 65-2497RK detectors. The 65-2497RK includes the 65-2494RK oxygen detector and a junction box. A two point terminal strip is provided inside the junction box for detector connections. The 65-2494RK does not include a junction box. Figure 1 below shows the components of the 65-2497RK.
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 oxygen detector into a 3/4” NPT hub. Two wires extend from the top of the detector housing body. Use these wires to connect the detector to a controller. One of the wires is white and one of the wires is green. The housing body includes two sockets installed on a circuit board.
• Select a site where the target gas is likely to be found first. NOTE: If your application does not require a specific mounting site, mount the detector at approximately breathing level. 3.10 .75 3/4 NPT Female 7.30 + .25 .38 3/4" NPT 3.65 .75 1.32 6.80 Max J-Box Ø 1.75 Rubber Spacers 3X 1 1/2-20 Thread for Calibration Cup Oxygen Detector 1 1/2-20 Thread for Calibration Cup 65-2494RK 65-2497RK Figure 3: Outline & Mounting Dimensions, 65-2494RK & 65-2497RK 2.
technique for the environmental rating of the junction box. The junction box is rated NEMA 4X. 6. Connect the two wires to the detector using the terminal block. CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the detector. You will connect the opposite end of the cable’s drain wire at the controller. 7. Secure the junction box cover to the junction box. 8.
Start Up This section describes procedures to start up the oxygen detector and place the detector 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 or plug in the incoming power, then turn on the controller. 4. Verify that the controller is on and operating properly.
WARNING: The controller is not an active gas monitoring device during the response test procedure. NOTE: Performing a response test on the oxygen detector may cause alarms. Be sure to put the controller into its calibration program or disable external alarms before performing this test. 1. Place the controller into its calibration program or disable external alarms. 2. Verify that the controller display reading is 20.9% oxygen. If the display reading is not 20.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the oxygen detector. NOTE: This troubleshooting guide describes detector problems only. See the controller operator’s manual for problems you may encounter with the controller. Table 2: Troubleshooting the Oxygen Detector Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
Replacing Components of the Oxygen Detector This section includes a procedure to replace the plug-in oxygen sensor, one to replace the hydrophobic membrane, and one to replace the entire oxygen detector assembly. 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 which is an irritant. Do not disassemble the sensor when replacing it with a new one.
Replacing the Oxygen Detector NOTE: In most cases, it is only necessary to replace the plug-in sensor. 1. Turn off the controller. 2. Turn off or unplug incoming power to the controller. 3. If the detector is installed directly on a controller, open the controller door. If the detector is installed remotely from a controller in a junction box, remove the junction box cover. 4.
If an application is not very demanding, for example detection in a clean, temperature controlled environment, and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate. If an application is very demanding, for example if the environment is not well controlled, then more frequent calibration than every 3 months may be necessary. Calibration This section describes how to calibrate the oxygen detector.
4. Allow the gas to flow to the detector for 2 minutes. 5. Set the zero reading according to the controller operator’s manual. 6. After setting the zero reading, turn the regulator’s on/off knob clockwise to turn it off. 7. Unscrew the regulator from the cylinder. 8. Unscrew the calibration cup from the oxygen detector. Make sure that you do not loosen the detector housing cap when you unscrew the calibration cup.
Parts List Table 3 lists replacement parts and accessories for the oxygen detector.
