35-3010RK-03 Sample Draw Detector Part Number: 71-0166RK Revision: C Released: 9/24/13 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-03 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-03.
Description This section describes the components of the 35-3010RK-03 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 block, and EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves through the flow system. The sample flow to the sensors is controlled by a bypass valve so that the total flow is more than that indicated by the flowmeter.
Charcoal Filter The charcoal filter is located above the LEL transmitter. It is held in place by a metal clip. The charcoal filter is placed before the CO sensor in the flow system. It scrubs out interfering gases which may cause the CO sensor to respond, such as H2S or certain hydrocarbons. Replace the charcoal filter when false high CO readings are noticed, especially in the presence of H2S. Pump The pump is located to the left of the main circuit board near the bottom left of the sample draw detector.
Flow Block The flow block is located in the lower right corner of the sample draw detector. All the sensors are installed in the flow block. The flow block routes 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. See “Installation” on page 8 for instructions to connect tubing to the EXHAUST fitting.
Carbon Monoxide Sensor The carbon monoxide gas sensor is installed in the upper left side of the flow block. It has 4 pins which mate with sockets in the preamp circuit board. Hydrogen Sulfide Gas Sensor The hydrogen sulfide gas sensor position is located in the upper right side of the flow block. In the 35-3010RK-03, the hydrogen sulfide gas sensor position in the flow block is occupied by a dummy sensor.
Interconnect Terminal Strip The interconnect terminal strip is the sixteen-point terminal strip near the bottom edge of the main circuit board. Use the interconnect terminal strip to connect the sample draw detector to power and a controller. Sensor/Transmitter Terminal Strip The sensor/transmitter terminal strip is the sixteen-point terminal strip near the right edge of the circuit board. Use the transmitter terminal strip to connect sensors or transmitters to the main circuit board.
Installation This section describes procedures to mount the sample draw gas detector in the monitoring environment and wire the sample draw detector to power and a gas monitoring controller. Mounting the Sample Draw Detector 1. Select the mounting site. Consider the following when you select the mounting site.
5. Repeat steps 3 and 4 for the remaining three mounting feet. 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 in. 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.
9. Connect the drain wire to an available chassis ground at the controller. RKI controllers typically have a ground stud that can be used to ground the cable’s drain wire.
Pump Factory Wired Pressure Switch Factory Wired Green White Black Green White Red Oxygen Sensor LEL Sensor Connector CO & H2S Sensors Plug Into Far Side of Preamp Circuit Board CO H2S LEL Detector Figure 6: Internal (Factory) Wiring, Sample Draw Detector 35-3010RK-03 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 operator’s 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.
If the display reading is 0% LEL, the combustible detector is in normal operation. If the display reading is not 0% LEL, perform a zeroing operation at the controller. See the controller operator’s manual for instructions. 6. Verify a reading of 20.9% oxygen on 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.
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 controller. Take appropriate action to avoid this, such as entering the calibration mode at the controller or disabling external alarms. 1. Verify that the controller is reading 0 for the combustible and CO channels and 20.9 for the oxygen channel.
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. Verify that the sensor and transmitter wiring is correct and secure. “Wiring the Sample Draw Detector to a Controller” on page 9 describes detector wiring connections. 2.
• 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. Recommended Action 1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample. 2. If necessary, set the correct flow rate with the bypass valve or flow adjust potentiometer. 3. If you cannot set the correct flow rate, check the sample line for obstructions or kinks. 4.
Replacing the Carbon Monoxide Sensor 1. Turn off incoming power. 2. Open the housing door of the sample draw detector. 3. Unscrew the 5 screws that retain the preamp circuit board. 4. Lift the preamp circuit board away from the flow block. Be careful not to pull on the cables that connect the preamp circuit to the main circuit board. There is a foam gasket in the bottom of each flow cavity beneath the circuit board. Make sure the gaskets stay in place. 5.
NOTE: The low flow potentiometer is accessible through a circular cutout in the main circuit board. The cutout is labeled PS1. 3. Verify that the low flow alarm is 0.6 SCFH (±0.2). Repeat steps 3 and 4 if necessary. 4. Use the flow adjust potentiometer (VR1) to set the flow to 1.2 SCFH. 5. Make sure the sample draw detector’s Fail LED is off.
9. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing connected to the regulator. Setting the Response Reading 1. Screw the regulator into the 4-gas calibration cylinder. 2. Connect the sample tubing to the regulator. 3. Follow the directions in the controller’s operator’s manual for setting the response reading for the LEL channel. 4.
2. Connect the calibration kit sample tubing to the regulator. 3. Follow the directions in the controller’s operator’s manual for setting the zero reading for the oxygen channel. 4. When the instructions call for applying gas to the detector, connect the sample tubing from the regulator to the inlet line at or near the INLET fitting. 5. Allow the gas to flow for one minute. 6. Set the zero reading according to the controller operator’s manual. 7. Disconnect the sample tubing from the inlet line.
Preparing for Calibration CAUTION: This procedure may cause alarms at the controller. Take appropriate action to avoid this, such as entering the calibration mode at the controller. 1. Open the housing door. 2. Set a voltmeter to measure in the millivolt (mV) range. It will be used in the calibration of the CO channel. • 3. When checking the mV output of the CO channel, plug the voltmeter leads into the test points in the AMP 1 section of the main circuit board.
NOTE: For convenience, leave the regulator connected to the sample tubing. Returning to Normal Operation 1. Remove the voltmeter leads from the test points. 2. Reconnect the incoming sample line. 3. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to stabilize. 4. Close the housing door. 5. Store the components of the calibration kit in a safe and convenient place. Parts List Table 2 lists replacement parts and accessories for the sample draw gas detector.
