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35-3000RKA-LEL Sample Draw Combustible Gas
Detector
Specifications
Table 1 lists specifications for the sample draw combustible gas detector.
Target Gas
Input Power
Construction (housing)
Dimensions
Weight
Sampling Method
Sample Flow
Detection Range
Response Time
Linearity
Repeatability
Table 1: Specifications
Combustible Gas
24 VDC
Fiberglass/polyester (NEMA 4X)
8.5 in. H x 6.5 in. W x 4.25 in. D
4.5 lbs.
sample draw
1.5 SCFH (nominal)
0 to 100% LEL
90% in 30 seconds
± 5% of detection range
± 2% of detection range
Sample Draw Combustible Gas Detector • 1
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Summary of Contents for RKI 35-3000RKA-LEL
- Page 1 35-3000RKA-LEL Sample Draw Combustible Gas Detector Specifications Table 1 lists specifications for the sample draw combustible gas detector. Table 1: Specifications Target Gas Combustible Gas Input Power 24 VDC Construction (housing) Fiberglass/polyester (NEMA 4X) Dimensions 8.5 in. H x 6.5 in. W x 4.25 in. D Weight 4.5 lbs.
- Page 2 Description This section describes the components of the sample draw combustible gas detector. The sample draw detector consists of the housing, flow system, and detection system. Mounting Foot, 4X Flow Adjust Potentiometer Flow Alarm Se tpo int Adjustment Po ten tiomet er Pu mp /flo w sw itch termina l block Se nso r Wiring...
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Page 3: Flow System
Flow System The sample draw detector’s flow system consists of the INLET fitting, filter, pump, flowmeter, bypass valve, status lights, pressure switch, and EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves through the flow system. Exhaust Bypass Valve... -
Page 4: Detection System
Status lights Two status lights are above the flowmeter. They are also visible through the window in the housing door. Pilot light The green Pilot light is on when the sample draw detector is receiving power. Fail light The red Fail light is on when the sample flow rate is below the low flow level. NOTE: The default low flow level is 0.6 SCFH ( ±... - Page 5 Connector 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. Sensor leads Four color-coded leads extend from the connector. The leads allow you to connect the combustible gas sensor to the main circuit board.
- Page 6 Pump terminal strip The pump terminal strip is the four-point terminal strip near the top edge of the circuit board. Use the pump terminal strip to connect the pump and pressure switch to the main circuit board. NOTE: The pump and pressure switch are factory-wired to the circuit board. See the “Installation”...
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Page 7: Installation
Installation This section describes procedures to mount the sample draw combustible gas detector in the monitoring environment and wire the sample draw detector to power and an external device. Mounting the Sample draw Combustible Gas Detector Select the mounting site. Consider the following when you select the mounting site. •... - Page 8 Close and latch the housing door. NOTE: The sample draw detector is shipped with the mounting feet “tucked under” the housing to protect the mounting feet during shipment. Slightly loosen the screw that secures the mounting foot to the housing, then rotate the mounting foot 180 degrees (see Figure 3).
- Page 9 Route the cable or wires in conduit leading from the sample draw detector to the recording or monitoring device and power. Connect the cable shield to an available chassis ground at the device end. LEL Sam pl e Draw Housing Transmitte r, In terna ll y Wi r ed P/N 57-1050RK REV.
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Page 10: Introducing Incoming Power
Start Up This section describes procedures to start up the sample draw combustible gas detector and place the sample draw detector into normal operation. Introducing Incoming Power Complete the installation procedures described earlier in this manual. Verify that the power/device wiring is correct and secure. Turn on or plug in the incoming power at the power source end. -
Page 11: Preventive Maintenance
Preparing for the response test NOTE: This procedure describes the RKI calibration kit that includes a gas collection bag. A calibration kit that uses a demand flow regulator is also available. Verify that the monitoring device is reading 0 %LEL (4 mA). -
Page 12: Troubleshooting
Calibrate the sample draw detector as described in the Calibration section on page 16. 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. 12 • Sample Draw Combustible Gas Detector... - Page 13 If the calibration/response difficulties continue, replace the sensor as described later in this section. If the calibration/response difficulties continue, contact RKI Instruments, Inc., for further instruction. Sample Draw Combustible Gas Detector • 13...
- Page 14 Replacing Components of the Combustible Gas Sample Draw Detector This section includes procedures to replace the sensor, filter, and ferrules. Replacing the combustible gas sensor Turn off incomming power. Open the housing door of the sample draw detector. Unscrew and remove the two screws that secure the retraining plate, then lift the plate, connector, and sensor out of the housing.
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Page 15: Adjusting The Low Flow Setting
Adjusting the Low Flow Setting The factory-set low flow setting is 0.6 SCFH (±0.2). To adjust the low flow setting: Use the flow adjust potentiometer (VR1) to set the flow to 0.6 SCFH. If the sample draw detector goes into low flow alarm before you can adjust the flow down to 0.6 SCFH, adjust the low flow potentiometer 1/4 turn clockwise, then attempt to set the flow again. -
Page 16: Preparing For Calibration
Calibration This section describes how to calibrate the sample draw combustible gas detector. It includes procedures to assemble the calibration kit, set the zero reading, set the response reading, and return to normal operation. NOTE: This procedure describes calibration using a gas collection bag. A demand flow calibration kit is also available for calibrating the combustible gas sample draw detector. -
Page 17: Setting The Response Reading
Connect the tubing from the gas collection bag to the fixed flow regulator, then open the clamp. Screw the fixed flow regulator onto the zero air calibration cylinder. The gas collection bag begins to fill. When the bag is full, unscrew the fixed flow regulator from the cylinder. Close the clamp, then disconnect the sample tubing from the fixed flow regulator. -
Page 18: Parts List
Parts List Table 4 lists replacement parts and accessories for the sample draw combustible gas detector. Table 2: Parts List Part Number Description 06-1248RK Sample tubing, 3/16 x 5/16, specify length, (for calibration kit) 17-2593RK Brass insert (for INLET and EXHAUST fittings) 17-2683RK Front ferrule (for INLET and EXHAUST fittings) 17-2688RK...
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