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Summary of Contents for RKI Instruments 65-2435RK
- Page 1 65-2435RK Hydrogen Compensated Carbon Monoxide Transmitter Operator’s Manual Part Number: 71-0073RK Revision: B Released: 7/6/20 RKI Instruments, Inc. www.rkiinstruments.com...
- Page 2 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.
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Page 3: Table Of Contents
Parts List ..............21 65-2435RK CO Transmitter • 3... -
Page 4: Overview
Explosionproof for Class I, Groups B, C, and D Input Voltage 19 - 30 VDC Sampling Method Diffusion Signal Output 4 to 20 mA Detection Range 0 to 300 PPM (parts per million) Response Time 90% in 30 seconds 4 • 65-2435RK CO Transmitter... -
Page 5: Description
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins to secure the sensor within the detector housing. A pre- amplifier, located between the sockets and two interconnect wires, conditions the sensor’s 65-2435RK CO Transmitter • 5... -
Page 6: Amplifier
CAUTION: The null potentiometer is factory set before shipment. It should only be adjusted in the field when the CO sensor is replaced. This adjustment is made only once after installing a new sensor. Do not adjust this pot when calibrating the CO transmitter. 6 • 65-2435RK CO Transmitter... -
Page 7: Junction Box
• 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 transmitter at approximately breathing level. 65-2435RK CO Transmitter • 7... -
Page 8: Wiring The Co Transmitter To A Controller
Do non install a non-explosion-proof controller in a classified location. 1. Turn off the controller. 2. Turn off or unplug incoming power at the power source end. 3. Remove the junction box cover. 8 • 65-2435RK CO Transmitter... - Page 9 8. Route the cable or wires leading from the CO transmitter through one of the conduit hubs at the controller housing. CAUTION: Do not route power and transmitter wiring through the same conduit hub. The power cable may disrupt the transmission of the transmitter signal to the controller. 65-2435RK CO Transmitter • 9...
- Page 10 +24 VDC (19 - 30 VDC) SPAN ZERO Controller or Recording Device CO Detector/ H2 Compensated Factory Wired Figure 3: Wiring the CO Transmitter to a Controller 10. Connect the cable’s drain to an available chassis ground at the controller. 10 • 65-2435RK CO Transmitter...
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Page 11: Startup
The CO sensor in the CO transmitter does respond to hydrogen in addition to CO. The transmitter has the ability to compensate for this response up to 10,000 ppm hydrogen. If up to 10,000 ppm of hydrogen is present, the CO transmitter will indicate only the CO concentration. 65-2435RK CO Transmitter • 11... -
Page 12: Maintenance
If the fail condition continues, contact RKI for further instruction. Slow or No Response/Difficult or Unable to Calibrate Symptoms • Unable to accurately set the zero or response reading during the calibration procedure. • The transmitter requires frequent calibration. 12 • 65-2435RK CO Transmitter... -
Page 13: Replacing Components Of The Co Transmitter
1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample. 2. If the calibration/response difficulties continue, replace the CO sensor as described later in this section. 3. If the calibration/response difficulties continue, contact RKI Instruments, Inc., for further instruction. Replacing Components of the CO Transmitter This section includes procedures to replace the CO sensor and amplifier. - Page 14 9. Carefully plug the replacement sensor into the socket pattern that is located in the top section of the detector housing. NOTE: Match the sensor’s male pins with the four female sockets as you plug the sensor into the sockets. 14 • 65-2435RK CO Transmitter...
- Page 15 Table 3: Reconnecting the CO Detector to the Amplifier CO Detector Lead Amplifier Terminal Strip Black Green Brown White 11. Reinstall the junction box cover. 12. Turn on or plug in incoming power at the power source end. 13. Turn on the controller. 65-2435RK CO Transmitter • 15...
- Page 16 CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 11. Set the null potentiometer on the amplifier as described in the Setting the Null Potentiometer section. 16 • 65-2435RK CO Transmitter...
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Page 17: Setting The Null Potentiometer
3. Unscrew the regulator from the hydrogen cylinder. Wait two minutes before proceeding. Leave the sample tubing connected to the regulator and the calibration cup. 65-2435RK CO Transmitter • 17... -
Page 18: Calibration
It describes calibration using a fixed flow regulator which has no on/off knob and allows sample to flow as soon as it is screwed into a cylinder. RKI Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator. -
Page 19: Setting The Zero Reading
2. Allow the gas to flow for two minutes, then verify that the reading matches the response reading (± 2mV) you determined earlier. If necessary, use the span potentiometer on the amplifier to adjust the reading to match the correct response reading. 3. Unscrew the regulator from the calibration cylinder. 65-2435RK CO Transmitter • 19... -
Page 20: Returning To Normal Operation
4. When the display reading falls below the alarm setpoints, return the controller to normal operation. 5. Verify that the controller display reading decreases and stabilizes at 0 ppm. 6. Store the components of the calibration kit in a safe and convenient place. 20 • 65-2435RK CO Transmitter... -
Page 21: Parts List
CO transmitter (includes detector and amplifier) 65-2470RK CO replacement detector assembly (includes sensor) 71-0073RK 65-2435RK Hydrogen Compensated CO Transmitter Operator’s Manual (this document) 81-0000RK-31 Calibration cylinder, 4,000 ppm hydrogen in air, 34 liter steel (for use in setting null potentiometer)
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