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- Page 1 35-3000RK-LEL Combustible Gas Sample-Draw Detector Operator’s Manual Part Number: 71-0104RK Revision: P1 Released: 9/18/04 RKI Instruments Inc. 1855 Whipple Road Hayward, CA 94544 PH: 800-754-5165 Fax: 510-441-5650 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 ..............20 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 3... -
Page 4: Overview
Weight 4.5 lbs. Sampling Method Sample-draw Sample Flow 1.5 SCFH (nominal) Detection Range 0 to 100% LEL Response Time 90% in 30 seconds Linearity ±5% of detection range Repeatability ±2% of detection range 4 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector... -
Page 5: Description
An aluminum subpanel is mounted to the interior of the housing. The sample-draw detector’s internal components are mounted to the subpanel. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 5... -
Page 6: Flow System
Use a flat-blade screwdriver to adjust the bypass valve. NOTE: The bypass valve allows fine adjustments of the flow rate. For a wider range of adjustment, use the flow adjust potentiometer (see Figure 1.) 6 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector... -
Page 7: Detection System
The top of the sensor includes five pins that plug into the socket connector. This connector allows you to replace the sensor without disconnecting the wiring. The sensor leads are soldered to the connector. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 7... - Page 8 (SPDT) and is rated for 2 amps at 25 VDC (resistive). If the pressure switch senses a low flow condition, the relay interrupts the signal from the sensor. The interrupted sensor signal causes a fail condition at the controller 8 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector...
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Page 9: Installation
6.5 in. 4.0 in. 3/4 in. conduit hub (total of 2 hubs) Note: The housing is 4.25 in. deep. Figure 3: Mounting the Combustible Gas Sample-Draw Detector Close and latch the housing door. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 9... -
Page 10: Connecting The Sample Lines To The Sample-Draw Detector
Connect the cable to the sample-draw detector’s interconnect terminal strip as shown in Figure 4. Close and latch the housing door of the sample-draw detector. 10 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector... - Page 11 Strip Not Used Gas Sensor, On This Internally Wired Version White Controller LEL Sensor Terminals Green Black - (DC -) Controller Terminals + 24 VDC Figure 4: Wiring the Sample-Draw Detector to a Controller 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 11...
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Page 12: Start Up
Verify a reading of 0 %LEL on the controller display screen for the applicable channel. If the display reading is 0 % LEL, start up is complete. The sample-draw detector is in normal operation. If the display reading is not 0 % LEL, continue with step 3. 12 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector... -
Page 13: Maintenance
Follow the instructions in the controller’s operator’s manual for entering calibration mode. Connect the calibration kit sample tubing to the fitting on the gas collection bag and run the tubing through the tubing clamp provided with the calibration kit. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 13... -
Page 14: Troubleshooting
Remove the calibration tubing from the INLET fitting, then reconnect the sample tubing to the INLET fitting. Quarterly Calibration RKI Instruments recommends calibrating the combustible gas sample-draw detector quarterly. Some applications may require a more or less frequent calibration schedule depending on environmental conditions, frequency of gas exposure, and other factors. - Page 15 Calibrate the sample-draw detector as described in “Calibration” on page 18. If the fail condition continues, replace the sensor as described later in this section. If the fail condition continues, contact RKI Instruments, Inc., for further instruction. Slow or no response/difficult or unable to calibrate Symptoms •...
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Page 16: Replacing Components Of The Combustible Gas Sample-Draw Detector
If the calibration/response difficulties continue, contact RKI Instruments, Inc., for further instruction. Replacing Components of the Combustible Gas Sample-draw Detector This section includes procedures to replace the sensor, hydrophobic filter, and ferrules. Replacing the combustible gas sensor Turn off the controller Turn off power to the controller. -
Page 17: Adjusting The Low Flow Setting
If the low flow alarm is set too low, turn the low flow potentiometer slightly clockwise. Repeat steps 3 and 4 if necessary. Use the flow adjust potentiometer (VR1) to set the flow to 1.5 SCFH. Make sure the sample-draw detector’s Fail light is off. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 17... -
Page 18: Calibration
Close the dispensing valve when the gas collection bag appears full. 10. Close the tubing clamp, then disconnect the sample tubing from the dispensing valve. 11. Remove the dispensing valve from the zero air calibration cylinder. 18 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector... -
Page 19: Setting The Fresh Air Reading
Returning to Normal Operation Wait approximately one minute to allow the combustible gas reading to decrease below the alarm level. Follow the instructions in the controller’s operator’s manual to exit the calibration mode. 35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 19... -
Page 20: Parts List
Calibration cylinder, 50% LEL methane in air 103 liter) 81-0076RK-01 Zero air calibration cylinder (34 liter) 81-0076RK-03 Zero air calibration cylinder (103 liter) 81-1001RK Dispensing valve (with knob) 81-1054RK Regulator (demand flow) 81-1126RK Gas collection bag (2 liter) 20 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector...
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