35-3010RKA-03 Sample-Draw Detector Head Part Number: 71-0134RK Revision: D 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 35-3010RKA-03 sample-draw detector. This manual also describes how to install, start up, maintain, and calibrate the detector. 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 35-3010RKA-03.
Description This section describes the components of the 35-3010RKA-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.
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 after the H2S sensor and 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.
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 10 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 35-3010RKA-03, the hydrogen sulfide gas sensor position in the flow block is occupied by a dummy sensor.
Oxygen Transmitter The oxygen transmitter is mounted to the right of the LEL transmitter and above the main circuit board. The amplifier includes the amplifier type selector, two internally wired terminal strips, span pot, zero pot, and test points. Transmitter Type Selector The transmitter type selector is near the bottom left corner of the amplifier. It is to the left of the detector terminal strip and below the span pot.
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 4: 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. 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 power and an external device. 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.
Sample Draw Housing Main Circuit Board Interconnect Terminal Strip Oxygen (Controller Transmitter Terminals) 24 VDC 4/20 (Feedback) + 4/20 (Feedback) CO (Controller Transmitter Terminals) + 24 VDC 24 VDC + 4/20 (Feedback) Figure 6: External (Field) Wiring, Sample-Draw Detector 12 • 35-3010RKA-03 Sample-Draw Detector LEL (Controller Transmitter Terminals)
TP+ T S E N U M S T R I N SENSOR FB 4 /20 24V 24V 4-20 ZERO RED WHT SPAN GRN BLK TP- BATT + GND TP + + TP - POWER/SIG P/N 57 -105 0R K REV.
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.
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 100 mV (± 2 mV). 7. Close the housing door. Operation Normal Operation During normal operation, the Pilot LED will be on and the flowmeter will indicate about 1.2 SCFH. The current gas readings will be indicated at the controller. See the controller’s operator’s manual for a description of the reading indications. Low Flow Alarm If the flowrate falls below 0.6 SCFH (±0.
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. 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 Combustible Sensor 1. Turn off incoming power. 2. Open the housing door of the sample-draw detector. 3. Unscrew and remove the two screws that secure the retaining plate, then lift the plate, connector, and sensor out of the housing. 4. Unplug the connector from the sensor. 5.
7. Reinstall the preamp circuit board with the sensors onto the flow block. 8. Turn on incoming power. 9. Calibrate the replacement sensor as described in “Calibration, CO Detector” on page 23. 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.
draw detector. If an application is not very demanding, for example detection in a clean, temperature controlled environment, and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate for the sample draw detector. If the application is very demanding, for example if the environment is not well controlled, then more frequent calibration than every 3 months may be necessary for the sample draw detector.
voltmeter reading is 100 mV ± 2 mV. 7. Disconnect the sample tubing from the inlet line. 8. 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 3-gas calibration cylinder. 2. Connect the sample tubing from the regulator to the inlet line at or near the sampledraw detector’s INLET fitting. 3. Allow the calibration gas to flow for one minute. 4.
2. Set a voltmeter to measure in the millivolt (mV) range. 3. Plug the voltmeter into the test points on the oxygen transmitter. Plug the positive lead into the test point labeled TP+; plug the negative lead into the test point labeled TP-. 4. Use the following formula to determine the correct test points output for the calibrating sample.
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 434 mV ± 2 mV. 7. Disconnect the sample tubing from the inlet line. 8. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing connected to the regulator. 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 reading to stabilize. 3. Close the housing door. 4.
5. Verify a voltmeter reading of 100 mV ± 2 mV at the AMP 1 test points for the CO channel as described in the Preparing for Calibration section above. 6. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the CO channel until the voltmeter reading is 100 mV ± 2 mV. 7. Disconnect the sample tubing from the inlet line. 8. Unscrew the regulator from the zero air cylinder. Leave the sample tubing connected to the regulator. Setting the Response (Span) Reading 1.
Parts List Table 2 lists replacement parts and accessories for the sample-draw gas detector.
