65-2451RK-04 Hydrogen Transmitter Operator’s Manual Part Number: 71-0298RK Revision: P1 Released: 11/8/13 RKI Instruments, Inc. www.rkiinstruments.
WARNING Read and understand this instruction manual before operating transmitter. Improper use of the transmitter could result in bodily harm or death. Periodic calibration and maintenance of the transmitter is essential for proper operation and correct readings. Please calibrate and maintain this transmitter 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 Hydrogen Detector . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2451RK-04 hydrogen transmitter. This manual also describes how to install, start up, configure, maintain, and calibrate the transmitter 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 hydrogen transmitter. Specifications Table 1 lists specifications for the hydrogen transmitter.
Description This section describes the components of the hydrogen transmitter. The transmitter is a 4 20 mA type detector head. It consists of the hydrogen detector, calibration cup/splash guard, amplifier, the amplifier junction box, and the detector junction box. The two junction box configuration is intended for situations where the detector needs to be installed at an inaccessible location.
Hydrogen Detector The hydrogen detector is a catalytic type detector that produces an electrical output that corresponds to the detection range. It is packaged in a 1/2 inch NPT nipple with a sintered metal flame arrestor on one end allowing ambient air to diffuse into the detector. The flame arrestor also contains any sparks which may occur within the detector. The detector has a built in molecular sieve that only allows hydrogen to diffuse into the detector.
response output during the calibration procedure. Turn the adjustment screw clockwise to increase the gas response and counterclockwise to decrease the gas response. CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not adjust them. Test Points The test points are on the left side of the amplifier (see Figure 1). The test points produce a 100 mV to 500 mV output that corresponds to the transmitter’s 4 to 20 mA output.
3/4 NPT Fem ale 2.70 .38 Rubber Spacer, 3X 3.65 10.30 MAX J-Box Hydrogen Detector 5.25 Calibration Cup/Splash Guard 1.13 Figure 2: Mounting the Hydrogen Transmitter 2. At the monitoring site you select, hang or mount the detector junction box with the detector facing down (see Figure 2). 3. Install 3/16 inch I.D. flexible polyurethane tubing to the fitting at the bottom of the calibration cup/splash guard and route it to an accessible area that is close to the amplifier junction box.
Wiring the Detector to the Amplifier WARNING: Always verify that the power to the controller is off before you make wiring connections. 1. Confirm that no power is being applied to the amplifier. If the amplifier has already been connected to a controller, turn off the controller and turn off or unplug power to the controller. 2. Remove the detector junction box’s cover from the junction box. 3. Remove the amplifier junction box’s cover from the junction box. 4.
Cable Shield Amplifier S G R W L EL B P W R / S IG Detector Terminal Strip Black Green White Red Black Green White Red Amplifier J-Box Detector J-Box Hydrogen Detector Calibration Cup/Splash G uard Figure 3: Wiring the Detector to the Amplifier 10. Reinstall the detector terminal strip into its socket. 11. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth) ground at the amplifier junction box.
Wiring the Amplifier to a Controller 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Remove the amplifier junction box’s cover from the junction box. 4. Guide a three-conductor, shielded cable, or three wires in conduit through the top conduit hub of the amplifier junction box. 5. Pull out the controller terminal strip, and connect the three wires to the terminal strip as follows (see Figure 4). • Connect the positive wire to the PWR/SIG “+” terminal.
+ 24 VDC 4 - 20 mA In (S) - (DC Ground) Cable Shield Amplifier J-Box Controller or Recording Device S R W G LEL B PWR / SIG Amplifier (Transmitter) Black Green White Red Detector Wires Figure 4: Wiring the Amplifier to a Controller 10. 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 hydrogen transmitter and place the transmitter 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. Refer to the controller operator’s manual. 3. Turn on power to the controller. 4. Turn on the controller. 5. Verify that the controller is on and operating properly.
7. Allow the gas to flow for the length of time determined in “Determining Response Time” on page 16. 8. Verify a voltmeter reading of 100 mV (±2 mV). 9. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is 100 mV (±2 mV). 10. Turn the regulator’s on/off knob clockwise to close it. 11. Disconnect the calibration cup/splash guard’s flexible tubing from the regulator. NOTE: Do not disconnect the flexible tubing from the calibration cup/splash guard. 12.
Preparing for the response test 1. Place the controller into its calibration mode or disable external alarms. 2. Verify that the controller display reading for the channel you are testing is 0 %LEL. If the display reading is not 0 %LEL, set the zero reading of the transmitter as described in “Start Up” on page 10, then continue this procedure. 3. Screw the regulator into the calibration cylinder. 4.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the hydrogen transmitter. NOTE: This troubleshooting guide describes transmitter problems only. See the controller operator’s manual for problems you may encounter with the controller. Table 2:Troubleshooting the Hydrogen Transmitter Condition Symptom(s) Probable Causes Recommended Action Fail Condition • Controller indicates a fail condition.
5. Disconnect the detector leads from the terminal block in the detector junction box. Note the position of the color-coded leads as you remove them. 6. Unscrew the detector from the detector junction box. 7. Guide the detector leads of the replacement detector through the bottom conduit hub of the detector junction box, then screw the mounting threads of the detector into the conduit hub.
leads were removed during this procedure, refer to Table 3 and Table 4 below.
Calibration Frequency Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 3 to 6 months is adequate for most hydrogen transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.
Calibration This section describes how to calibrate the hydrogen transmitter. It includes procedures to prepare for calibration, set the zero reading, set the response reading, and return to normal operation. WARNING: The controller is not an active gas monitoring device during the calibration procedure. NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder, a 0.
7. Leave the calibration cup/splash guard’s flexible tubing connected to the regulator. Setting the Response Reading 1. Screw the regulator into the calibration cylinder. Verify that the calibration gas is representative of the transmitter’s target gas. 2. Turn the regulator’s on/off knob counterclockwise to open the regulator. 3.
Parts List Table 5 lists replacement parts and accessories for the hydrogen transmitter. Table 5:Parts List Part Number Description 06-1248RK Sample tubing (3/16 in. x 5/16 in.
