65-2321RK Oxygen Transmitter Operator’s Manual Part Number: 71-0175RK Revision: A Released: 7/3/14 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 Oxygen Detector . . . . . . . . . . . . . . . . . . . . . .
Overview This instruction manual describes the 65-2321RK capillary type oxygen transmitter. 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. Specifications Table 1 lists specifications for the oxygen transmitter.
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. Housing Body Cap Gasket Plug-In Oxygen Sensor Detector Housing Cap Hydrophobic Membrane Figure 2: Oxygen 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 oxygen detector into the 3/4” NPT hub on the bottom of the junction box.
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).
from a mounting surface and insure that there is enough room to install a calibration cup on the detector during calibration. 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. Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site.
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. 5.
Controller D etector/Tran smitter Terminals, Typical Design ations S + Cable Shield S SIG/ PWR TOXIC OXY SP AN Z ERO Controller Housing J-Box Green White Oxygen Detector 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.
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. Maintenance This section describes maintenance procedures. It includes preventive maintenance, troubleshooting, and component replacement procedures. Preventive Maintenance This section describes a preventive maintenance schedule to ensure the optimum performance of the oxygen transmitter.
4. When the display reading rises above the decreasing alarm setpoint, return the controller to normal operation. Quarterly Calibrate the oxygen transmitter as described in “Calibration” on page 13 of this manual. See the calibration frequency discussion in “Calibration Frequency” on page 13 to determine if a quarterly calibration schedule fits your needs.
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.
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 -. See Figure 4 on page 7 for the detector wiring connections to the amplifier. 9. Reinstall the detector terminal strip into its socket. 10. Reinstall the junction box cover. 11. Turn on or plug in power to the controller. 12. Turn on the controller and place it into normal operation.
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. recommends a calibration frequency of every 3 months for the oxygen transmitter.
3. Turn the regulator knob counterclockwise to open the regulator. 4. Allow the gas to flow for two minutes and verify a reading of 434 mV (±2 mV). If necessary, use the span pot on the amplifier to adjust the reading to the correct value. 5. Turn the regulator knob clockwise to close the regulator. 6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing connected to the regulator and the calibration cup.
Parts List Table 3 lists replacement parts and accessories for the oxygen transmitter.
