Related Manuals for RKI Instruments 65-2395RK-CH4-4
Summary of Contents for RKI Instruments 65-2395RK-CH4-4
- Page 1 65-2395RK-CH4-4 Methane Transmitter Operator’s Manual Part Number: 71-0468 Revision: P1 Released: 10/17/18 RKI Instruments, Inc. www.rkiinstruments.com...
- Page 2 Typical calibration frequencies for most applications are between 6 and 12 months, but can be required more often or less often based on your usage. 65-2395RK-CH4-4 Combustible Gas Transmitter...
- Page 3 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 4: Table Of Contents
Parts List ..............23 65-2395RK-CH4-4 Combustible Gas Transmitter... -
Page 5: Overview
WARNING: When using the 65-2395RK-CH4-4, you must follow the instructions and warnings in this manual to assure proper and safe operation of the 65-2395RK-CH4-4 and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the 65-2395RK-CH4-4 as described in this manual. -
Page 6: Description
Description The 65-2395RK-CH4-4 methane transmitter utilizes an infrared type of detector which has some advantages over a catalytic type of combustible detector. The infrared detector will generally have a longer service life than a catalytic detector, it will require calibration less often, and it can detect methane even if there is no oxygen in the sample which allows detection of methane in an inert atmosphere. -
Page 7: Methane Detector
Controller Terminal Strip The controller terminal strip is a three position plug-in style terminal strip located near the top of the amplifier. Use the controller terminal strip to wire the methane transmitter to a controller. 65-2395RK-CH4-4 Combustible Gas Transmitter • 7... -
Page 8: Amplifier Junction Box
3/4” conduit hub. Three spacers installed on the back of the junction box controls the distance of the junction box from a mounting surface. A ground boss near the top conduit hub provides an external earth ground connection. 8 • 65-2395RK-CH4-4 Combustible Gas Transmitter... -
Page 9: Installation
For lighter gases, mount the detector near the ceiling; for heavier gases, mount the detector near the floor. • The junction boxes should be mounted no further than 200 feet from each other. 65-2395RK-CH4-4 Combustible Gas Transmitter • 9... - Page 10 Install 3/16 inch I.D. flexible polyurethane tubing to the fitting at the bottom of the calibration cup/splash guard and route it to an accessible area that is close to the amplifier junction box. See the “Parts List” on page 23 for available tubing. 10 • 65-2395RK-CH4-4 Combustible Gas Transmitter...
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Page 11: Wiring The Detector To The Amplifier
To make wiring more convenient, use wire colors that correspond to the detector wire colors: red, white, green, and black. NOTE: Consult RKI Instruments, Inc. for cable lengths longer than 200 feet. Connect the wires to the terminal block in the detector junction box. - Page 12 The amplifier mounting screw is a convenient grounding location. Install a lug on the shield drain wire or wrap the shield drain wire around the mounting screw. Do not connect the shield drain wire at the detector junction box. 12 • 65-2395RK-CH4-4 Combustible Gas Transmitter...
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Page 13: Wiring The Amplifier To A Controller
CAUTION: Do not route power and transmitter wiring through the same controller conduit hub. The power cable may disrupt the transmission of the transmitter signal to the controller. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in Figure 5. 65-2395RK-CH4-4 Combustible Gas Transmitter • 13... - Page 14 10. 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. 14 • 65-2395RK-CH4-4 Combustible Gas Transmitter...
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Page 15: Startup
The procedure below describes applying zero emission air, usually called zero air, using a calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator. -
Page 16: Maintenance
It includes daily and biannual procedures. Daily Verify a display reading of 0 %volume at the controller. Investigate significant changes in the display reading. Biannually Calibrate the methane transmitter as described in “Calibration” on page 21 of this manual. 16 • 65-2395RK-CH4-4 Combustible Gas Transmitter... -
Page 17: Troubleshooting
This junction box was likely installed somewhere difficult to access. Turn off the controller. Turn off or unplug power to the controller. Unscrew the calibration cup/splash guard from the detector. Remove the detector junction box’s cover from the junction box. 65-2395RK-CH4-4 Combustible Gas Transmitter • 17... - Page 18 Make sure the amplifier is seated flat in the junction box. Install the new amplifier into the junction box with the screw, lock washer, and flat washer you removed in step 5 above. 18 • 65-2395RK-CH4-4 Combustible Gas Transmitter...
- Page 19 The methane transmitter’s 4-20 mA signal should be stable by the time the controller’s warmup period is over. 12. Allow the transmitter to warm-up for 5 minutes. 13. Calibrate the transmitter as described in “Calibration” on page 21 of this manual. 65-2395RK-CH4-4 Combustible Gas Transmitter • 19...
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Page 20: Calibration Frequency
10. Add 1 minute to the length of time determined in step 6. This is the response time for the detector. When performing a response test, zero adjustment, or span adjustment, gas must be applied for this length of time. 20 • 65-2395RK-CH4-4 Combustible Gas Transmitter... -
Page 21: Calibration
Time” on page 20 and verify a reading of 100 mV (±2 mV). If necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (±2 mV). Turn the regulator’s on/off knob clockwise to close the regulator. Unscrew the regulator from the zero air calibration cylinder. 65-2395RK-CH4-4 Combustible Gas Transmitter • 21... -
Page 22: Setting The Response Reading
When the controller display reading falls below the alarm setpoints, return the controller to normal operation. Verify that the controller display reading decreases and stabilizes at 0 %volume. Store the components of the calibration kit in a safe and convenient place. 22 • 65-2395RK-CH4-4 Combustible Gas Transmitter... -
Page 23: Parts List
Steel calibration cylinder, zero emission air, 34-liter 81-1050RK Regulator, 0.5 liter/minute; with pressure gauge and flow control knob, for 17 liter and 34 liter steel calibration cylinders 81-1103RK-01 Calibration cup/splash guard, with diffuser holes 82-0006RK Pot adjust screwdriver, for calibration 65-2395RK-CH4-4 Combustible Gas Transmitter • 23...
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