65-2322RKSS Oxygen Transmitter Operator’s Manual Part Number: 71-0299RK Revision: 0 Released: 7/3/14 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 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.
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).
The amplifier is factory installed in the junction box. A cover on the front of the junction box allows access to the interior of the junction box. A locking set screw on the junction box cover allows you to secure the junction box cover and prevent it from being removed. Installation This section describes procedures to mount the oxygen transmitter in the monitoring environment and wire the transmitter to a controller. Mounting the Oxygen Transmitter 1.
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: 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.
+ S C o nt rolle r D e te ct or/T ran sm it te r Te rm in als, Ty pic al D esig n at ion s C a ble S h ield C o nt rolle r H o us ing S S IG /P W R T OX I C OX Y S P AN Z E RO J-B ox G re e n W h it e O xyg e n D et ec to r Figure 4: Wiring the Oxygen 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 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.
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. Store the components of the calibration kit in a safe and convenient place. 15. Remove the voltmeter leads from the test points. 16. Secure the junction box cover to the junction box.
Performing the response test 1. Exhale into the bottom of the oxygen detector for a few seconds. 2. Stop exhaling into the bottom of the detector, then verify that the reading on the voltmeter decreased from the normal reading, 434 mV. NOTE: If the reading does not decrease, calibrate the detector as described in “Calibration” on page 13. 3. Remove the voltmeter leads from the amplifier test points, then secure the junction box cover to the junction box. 4.
Table 2:Troubleshooting the Oxygen 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 fresh air or zero reading during calibration. • Transmitter requires frequent calibration. • The calibration cylinder is low, out-dated, or defective.
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 power to the controller. 3. Remove the junction box cover. 4. Remove the detector terminal strip from its socket. 5. Disconnect the detector leads from the detector terminal strip. Note the position of the color-coded leads as you remove them. 6. Unscrew the detector from the junction box conduit hub. 7.
amplifier connections. 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. 9. Turn on power to the controller. 10. Turn on the controller and place it into normal operation. 11. Allow the transmitter to warm-up for 5 minutes. 12. Calibrate the transmitter as described in “Calibration” on page 13 of this manual.
5. Use the following formula to determine the correct test points output for the calibrating sample. Output (mV) = (calibrating sample/fullscale) X 400 + 100 The concentration of oxygen in the atmosphere is 20.9%, so when setting the fresh air reading, you will set the test points output to 434 mV (±2 mV). 434(mV) = (20.9/25) X 400 +100 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.
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.
