35-3010RK-07 Sample-Draw Detector Part Number: 71-0214RK Revision: B Released: 9/10/12 www.rkiinstruments.
WARNING Read and understand this instruction manual before operating detector. Improper use of the detector could result in bodily harm or death. Periodic calibration and maintenance of the detector is essential for proper operation and correct readings. Please calibrate and maintain this detector 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 Housing . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 35-3010RK-07 sample draw detector. This manual also describes how to install, start up, maintain, and calibrate the sample draw detector when it is used with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and accessories for the detector. Specifications Table 1 lists specifications for the 35-3010RK-07.
Description This section describes the components of the 35-3010RK-07 sample draw detector. The sample draw detector consists of the housing, flow system, and detection system.
Flow System The sample draw detector’s flow system consists of the INLET fitting, hydrophobic filter, charcoal filter, pump, flowmeter, bypass valve, status lights, pressure switch, flow blocks, and EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves through the flow system.
Charcoal Filter The charcoal filter is located in the top left corner of the enclosure. It is held in place by a metal clip. The charcoal filter is placed after the H2S sensor and before the CO sensor (if one is installed) in the flow system. It scrubs out interfering gases which may cause the CO sensor to respond, such as H2S or certain hydrocarbons. It is included in this version of the sample draw detector in case a CO sensor is added in the field.
Flow Blocks Both flow blocks are located in the lower right corner of the sample-draw detector. The oxygen and H2S sensors are installed in the larger flow block. The smaller flow block houses the IR CH4 sensor. The flow blocks route the sampled air to each sensor. EXHAUST Fitting The EXHAUST fitting on the bottom of the housing allows the gas sample to exit the sample draw detector. The EXHAUST fitting accepts 1/4 in. rigid tubing.
Main Circuit Board Pump Terminal Stip Test Point CAL - 1 Fail LED Test Point CAL + 1 Flowmeter Test Point CAL - 2 Flow Adjust Pot Test Point CAL + 2 Low Flow Adjust Reset Switch Pilot LED Relay Pressure Switch Zero Span Amp 1 (CO) Interconnect Terminal Strip Zero Span Amp 2 (H2S) Sensor/Transmitter Terminal Strip AC Terminal Strip Not Used Figure 3: Main Circuit Board The main circuit board includes the interconnect terminal strip, sensor/transmitter terminal strip, amp 1 circuit, amp 2 cir
Amp 1 and Amp 2 Circuits These circuits are located to the left of the sensor/transmitter terminal strip. They each include test points, a zero pot, and a span pot. Amp 1 is on the left and is for the CO channel. Amp 2 is on the right and is for the H2S channel. Since there is no CO channel in the 35-3010RK-07, Amp 1 is not used. The zero and span pots are used during calibration. Use the span pot to make adjustments to gas response readings and the zero pot to make adjustments to the zero reading.
Installation This section describes procedures to mount the sample draw gas detector in the monitoring environment and wire the sample draw detector to a controller. Mounting the Sample Draw Detector 1. Select the mounting site. Consider the following when you select the mounting site.
6. Position the sample draw housing on a vertical surface at eye level (4 1/2 to 5 feet from the floor). 7. Insert 1/4 in. or 5/16 screws through the slots in the mounting feet to secure the housing to the mounting surface. Connecting the Sample Lines to the Sample Draw Detector 1. Attach 1/4 in. O.D. rigid polypropylene or rigid Teflon sample tubing to the INLET fitting.
Sample Draw Housing Main Circuit Board Interconnect T erm inal Strip Controller LEL Terminals R W G B Controller Oxygen + (W ) Terminals (G) 24 VDC H2S S (4/20 m A) (Controller Transmitter Terminals) 24 VDC + Figure 5: External (Field) Wiring, Sample Draw Detector 10 • 35-3010RK-07 Sample-Draw Detector
Pump Factory W ired Pressure Switch Factory W ired Green W hite Black Green W hite Red Oxygen Sensor IR LEL Sensor Connector CO Not Used H2S H2S Sensor Plugs Into Far Side of Preamp Circuit Board IR LEL Detector Figure 6: Internal (Factory) Wiring, Sample Draw Detector 35-3010RK-07 Sample-Draw Detector • 11
Start Up This section describes procedures to start up the sample draw detector and place the sample draw detector 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. See the controller instruction manual. 3. Turn on or plug in the incoming power at the controller, then turn on the controller. 4. Verify that the controller is on and operating properly. 5.
the controller instruction manual for directions. 6. Verify a reading of 20.9% oxygen for the oxygen channel at the controller. If the display reading is 20.9% oxygen the oxygen detector is in normal operation. If the display reading is not 20.9% oxygen, perform a fresh air adjustment operation at the controller. See the controller instruction manual for directions. 7. Remove the voltmeter from the test points. 8. Close the housing door.
Monthly This procedure describes a test to verify that the sample draw detector responds properly to the target gases. Preparing for the response test CAUTION: This procedure may cause alarms at the monitoring device. Take appropriate action to avoid this, such as entering the calibration mode at the monitoring device. 1. Verify that the controller is reading 0 for the IR CH4 and H2S channels and 20.9 for the oxygen channel. If the reading is not 0 for the IR CH4 or H2S channels or 20.
Probable Causes • The sample draw detector’s flow rate is too low because of an obstructed sample line, failed pump, etc. • The sample draw detector is malfunctioning. • The sensor or transmitter wiring is disconnected or misconnected. Recommended Action 1. At the sample draw detector, set the correct flow rate with the bypass valve or flow adjust potentiometer. 2. If you cannot set the correct flow rate, check the sample lines for obstructions or kinks. 3.
Replacing Components of the Sample Draw Detector This section includes procedures to replace the sensors, the hydrophobic filter, and the charcoal filter. Replacing the IR CH4 Sensor 1. Turn off or unplug incoming power. 2. Unscrew the four screws that hold the circuit board on the flow block. 3. Pull the circuit board off the flow block. 4. Unplug the infrared detector from the circuit board. 5. Plug the new detector into the circuit board. 6. Reinstall the circuit board to the flow block. 7.
9. Calibrate the replacement sensor as described in “Store the components of the calibration kit in a safe and convenient place.” on page 22. Replacing the Hydrophobic Filter 1. Turn off or unplug power to the controller. 2. Locate the hydrophobic filter. It is just to the left of the main circuit board. 3. Grasp the hydrophobic filter and pull it out of its metal clamp. 4. Remove the rubber seals from each end of the hydrophobic filter and remove the filter. 5.
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 sample draw detector applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months for the oxygen and H2S sensors and every 6 months for the IR CH4 sensor in the sample draw detector.
Setting the Zero Reading NOTE: If you can verify a fresh air environment, it is not necessary to use a zero air calibration cylinder to set the zero reading. 1. Screw the regulator into the zero air cylinder. 2. Connect the calibration kit sample tubing to the regulator. 3. Connect the sample tubing from the regulator to the inlet line at or near the INLET fitting. 4. Allow the gas to flow for 1 minute. 5.
Calibration, IR CH4 Detector This section describes how to calibrate the IR CH4 sensor in the sample draw detector. It includes procedures to set the zero reading, set the response reading, and return to normal operation. NOTE: This procedure describes calibration using a demand flow regulator, a zero air calibration cylinder, and a 4-gas calibration cylinder.
Returning to Normal Operation 1. Reconnect the incoming sample line. 2. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the readings to stabilize. 3. Close the housing door. 4. Store the components of the calibration kit in a safe and convenient place. Calibration, Oxygen Detector This section describes how to calibrate the oxygen detector in the sample-draw detector. It includes procedures to set the zero reading, set the fresh air reading, and return to normal operation.
Setting the Fresh Air Reading CAUTION: This procedure may cause alarms at the controller. Take appropriate action to avoid this, such as entering the calibration mode at the controller. NOTE: If you suspect the sampling area to not be a fresh air environment (free of combustible or toxic gases and of normal oxygen content, 20.9%), it is necessary to use a zero air cylinder when setting the zero reading. 1. Open the housing door. 2. The fresh air reading for the oxygen channel is set at the controller.
Parts List Table 4 lists replacement parts and accessories for the sample draw gas detector.
