35-3001A-09 Oxygen/Hydrogen Sulfide Sample-Draw Detector Operator’s Manual Part Number: 71-0311RK Revision: P3 Released: 9/17/14 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 External Components. . . . . . . . . . . . . . . .
Overview This operator’s manual describes the 35-3001A-09 oxygen/hydrogen sulfide sample-draw detector. This manual also describes how to install, start up, maintain, and calibrate the sample-draw detector when using it with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and accessories for the sample-draw detector. Specifications Table 1 lists specifications for the oxygen/hydrogen sulfide sample-draw detector.
Description This section describes the components of the oxygen/hydrogen sulfide sample-draw detector.
installation where general purpose equipment is in use. The housing door is hinged on the left side and is secured by two latches on the right side. The flowmeter and status LEDs are visible through a window in the housing door. Four mounting feet are attached to the back of the housing (one at each corner). Use the mounting feet to install the housing to a vertical surface. Sample Fittings The sample fittings are located on the left side of the bottom of the housing.
Detector/Amp Terminal Strip The detector/amp terminal strip is the upper twelve-point terminal strip in the bottom right corner of the main circuit board. Use the detector/amp terminal strip to connect the oxygen sensor to the oxygen amplifier and to connect the oxygen amplifier and the hydrogen sulfide sensor to the main circuit board.
Sensor Flow Control Valve The sensor flow control valve is mounted to the flowmeter circuit board above the flowmeter. The sensor flow control valve adjusts the flow rate to the detector. Turn the valve’s knob clockwise to increase the flow and counterclockwise to decrease the flow. Status LEDs Two status LEDs are above the flowmeter. They are also visible through the window in the housing door. The green Pilot LED is on when the sample-draw detector is receiving power from the controller.
Oxygen Amplifier The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that corresponds to the detection range and transmits the signal to a gas monitoring controller. The amplifier is mounted on the top middle edge of the main circuit board. It consists of the zero pot, span pot, controller terminal strip, detector terminal strip, and test points.
Hydrogen Sulfide Sensor/H2S Amplifier The hydrogen sulfide sensor is a plug-in sensor that plugs into the back of the H2S amplifier. The sensor and amplifier are retained in the flow block by two screws. The flow block is mounted to the middle of the main circuit board. It is the upper of the two flow blocks mounted to the main circuit board.
Installation This section describes procedures to mount the sample-draw 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: • Is there enough room to open the housing door and make wiring and tubing connections at the bottom of the housing? • Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
2. 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. 3. Slightly loosen the screw that secures the mounting foot to the housing, then rotate the mounting foot 180 degrees (see Figure 5). 4. Tighten the screw that secures the mounting foot to the housing. 5. Repeat steps 3 and 4 for the remaining three mounting feet. 6.
ring, if it came out, in the orientation shown in Figure 6. 4. Screw the inlet fitting tube nut back onto the fitting body. See the next section for instructions to install a new piece of tubing into the fitting. Connecting the Sample Lines to the Sample-Draw Detector See Figure 6 for the fitting layout. Installing the Inlet Line with Particle Filter 1. Connect the particle filter to the tubing stub on the inlet by pushing the flexible tubing on the filter onto the stub.
Installing the Exhaust Line 1. Loosen the nut on the exhaust fitting until 3 threads are visible. 2. Push 1/4” O.D. rigid polypropylene or rigid Teflon sample tubing into the fitting until it stops. Flexible polyurethane tubing may be used with an appropriate insert. RKI Instruments, Inc. recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x 0.170” I.D. tubing based on your length requirements. See “Specifications” on page 1 for maximum tubing lengths based on tubing size.
8. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in Figure 7. Refer to the controller operator’s manual and the controller detector head specification sheet for the 35-3001A-09 for detector/terminal strip connections specific to the controller.
9. 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. 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 wiring is correct and secure.
3. Set a voltmeter to measure in the millivolt (mV) range. 4. Plug the voltmeter leads into the test points on the oxygen amplifier. Plug the positive lead into the red (+) test point; plug the negative lead into the black (-) test point. 5. Verify a voltmeter reading of 434 mV (± 2 mV). 6. If necessary, use a small flat-blade screwdriver to adjust the span potentiometer until the voltmeter reading is 434 mV (± 2 mV). 7. Remove the voltmeter leads from the oxygen amplifier’s test points. 8.
Preparing for the response test NOTE: This procedure describes the RKI calibration kit that includes a demand flow regulator. 1. Verify that the display reading at the controller is 20.9% for the oxygen channel and 0 ppm for the H2S channel. If the display reading is not 20.9% for the oxygen channel or 0 ppm for the H2S channel, set the zero reading as described in “Calibration, Oxygen Sensor” on page 21 or “Calibration, H2S Sensor” on page 22, then continue this procedure. 2.
12. Reconnect the sample tubing to the inlet fitting. Quarterly Calibration Calibrate the sample-draw detector as described in “Calibration, Oxygen Sensor” on page 21 and “Calibration, H2S Sensor” on page 22. Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the sample-draw detector. NOTE: This troubleshooting guide describes sample-draw detector problems only.
• 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 a demand flow regulator calibration kit is used, use a different demand flow regulator to determine if the original one is functioning properly. 3. If necessary, set the correct flow rate with the sensor flow control valve. 4. If you cannot set the correct flow rate, check the sample line for obstructions or kinks. 5.
and sensor off of the flow block. There is a gasket at the bottom of the flow block. Be sure the gasket stays in place. 5. Unplug the sensor from the H2S amplifier. 6. Verify that you are using the correct replacement sensor, then plug the sensor into the H2S amplifier. 7. Place the sensor and amplifier in the H2S sensor cavity. 8. Secure the H2S amplifier on the flow block with the two screws you removed in step 4. 9. Close and latch the housing door. 10. Turn on power to the controller. 11.
Table 3:Reconnecting the Amplifier to the Oxy Terminals on the Detector/Amp Terminal Strip Amplifier Detector Terminal Strip Detector/Amp Terminal Strip on Main PCB OXY “+” OXY “+” OXY “-” OXY “-” NOTE: When the sample-draw detector is first powered up with a new amplifier, the initial output may be either high or below zero depending on the setting of the span pot. Be sure to make arrangements so that this does not cause unwanted alarms. 10. Turn on power to the controller. 11.
Replacing the Hydrophobic Filter 1. Open the housing door of the sample-draw detector. 2. Disconnect the filter from the rubber elbows on each end of the filter, then remove the filter from the sample-draw detector. 3. Install the new filter. Be sure the side of the filter marked “INLET” is connected to the elbow that is connected to the inlet fitting. 4. Verify that the flow rate is approximately 1.0 SCFH, then close the housing door. Replacing the Particle Filter 1.
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.
section, Setting the Zero Reading. 5. Disconnect the sample tubing from the inlet fitting. 6. Unscrew the regulator from the zero air calibration cylinder. Setting the Zero Reading 1. Screw the demand flow regulator onto the 100% N2 calibration cylinder. NOTE: If you do not want to keep two calibration cylinders, 100% N2 and 25 ppm H2S in nitrogen, you may use the 25 ppm H2S in nitrogen to zero the oxygen sensor. 2. Connect the sample tubing from the regulator to the inlet line. 3.
2. Screw the regulator into a zero air calibration cylinder. 3. Set a voltmeter to measure in the millivolt (mV) range and plug the leads into the H2S amplifier. Plug the positive lead into the red (+) amplifier test point; plug the negative lead into the black (-) amplifier test point. 4. Use the following formula to determine the correct test points output for the test sample.
Parts List Table 2 lists replacement parts and accessories for the sample-draw detector. Table 4: Parts List Part Number Description 06-1248RK Sample tubing, 3/16 x 5/16, specify length 06-1248RK-03 Sample tubing, 3/16 in. x 5/16 in.
