35-3001A-02 Oxygen Sample-Draw Detector Operator’s Manual Part Number: 71-0308RK Revision: P4 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-02 oxygen 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 sample-draw detector. See the controller Operator’s Manual for information specific to the controller.
Description This section describes the components of the oxygen sample-draw detector.
External Components This section describes the sample-draw detector’s external components. Housing The sample-draw detector’s fiberglass housing is weather- and corrosion-resistant. It is suitable for 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).
Main Circuit Board The main circuit board includes the detector/amp terminal strip, interconnect terminal strip, oxygen sensor terminal strip, pump connector, and flowmeter circuit board connector (see Figure 1). 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 amplifier and to connect the amplifier to the main circuit board.
flowmeter measures the flow in the range 0.2 to 2.0 SCFH (Standard Cubic Feet per Hour). The optimum flow rate is 1.0 SCFH. 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 sensor. Turn the valve’s knob counterclockwise to increase the flow and clockwise to decrease the flow. Status LEDs Two status LEDs are above the flowmeter.
zero output and counterclockwise to decrease the zero output. Span Pot The span pot is located below the zero pot (see Figure 1). Use a small flat blade screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s fresh air output during the start up and calibration procedure. Turn the adjustment screw clockwise to increase the fresh air output and counterclockwise to decrease the fresh air output. CAUTION: The amplifier includes an additional pot. It is factory-set. Do not adjust it.
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 3). 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 4. 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 4 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 5. Refer to the controller operator’s manual and the controller detector head specification sheet for the 35-3001A-02 for detector/terminal strip connections specific to the controller.
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. Refer to the controller operator’s manual for connections at the controller. 3. Turn on or plug in the power to the controller, then turn on the controller. 4. Verify that the sample-draw detector’s Pilot LED is on.
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 test points. 8. Close the housing door. Maintenance This section describes maintenance procedures. It includes preventive maintenance procedures. This section also includes procedures to troubleshoot the sample-draw detector, replace components of the sample-draw detector, and adjust the low flow setting.
Performing the response test 1. Exhale into the sample-draw detector’s inlet fitting. 2. Stop exhaling into the sample line, then verify that the reading on the voltmeter decreased from the normal reading, 434 mV. NOTE: If the reading does not decrease, calibrate the detector as described in “Calibration” on page 18. 3. Remove the voltmeter leads from the amplifier test points. 4. Reconnect the sample tubing to the inlet fitting.
• The sensor requires frequent calibration. Probable causes • The calibration cylinder is low, out-dated, or defective. • If a demand flow regulator calibration kit is used, the demand flow regulator is not functioning properly. • 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.
12. Calibrate the replacement sensor as described in “Calibration” on page 18. Replacing the Amplifier 1. Turn off the controller. 2. Turn off power to the controller. 3. Open the housing door of the sample-draw detector. 4. Remove the detector and controller plug-in terminal strips by grasping the sides of the strips with your fingers. Let the terminal strips hang by their connected wires while you replace the amplifier. 5.
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. Disconnect the tubing routed to the sampling area, if installed, from the particle filter. 2.
environment, and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate. If an application is very demanding, for example if the environment is not well controlled, then more frequent calibration than every 3 months may be necessary. Calibration This section describes how to calibrate the oxygen sensor in the sample-draw detector.
4. Verify a voltmeter reading of 100 mV (± 2 mV). 5. If necessary, use the zero potentiometer on the amplifier to adjust the reading to 100 mV (± 2 mV). 6. Disconnect the sample tubing from the sample-draw detector’s inlet fitting. 7. Reconnect the incoming sample line to the inlet fitting. 8. Unscrew the regulator from the calibration cylinder. Returning to Normal Operation 1. Wait approximately one minute to allow the oxygen reading to stabilize. 2.
