65-2481RK Multi Point Detector Operator’s Manual Part Number: 71-0204RK Revision: B Released: 7/18/14 RKI Instruments, Inc. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Detectors. . . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2481RK multi point direct connect detector. This manual also describes how to install, start up, maintain, and calibrate the 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 WARNING: Do not use this product in a manner not specified in this instruction manual. Table 1 lists specifications for the multi-point detector.
NOTE: The following symbol on the detector label is a caution to the user to refer to this documentation for installation and operation instructions: ! WARNING: When using the 65-2481RK, you must follow the instructions and warnings in this manual to assure proper and safe operation of the 65-2481RK and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the 65-2481RK as described in this manual.
Description This section describes the multi-point detector. It consists of the detectors, the terminal strips, the conduit seal, and the junction boxes. Detectors This section describes the components of the various detectors that are used with each model of the 65-2481RK. 61-0140RK LEL Detector LEL Detector Figure 1: 61-0140RK LEL Detector Component Location The combustible gas detector is a catalytic type detector that produces an electrical output that corresponds to the detection range.
61-0190RK IR LEL Detector IR LEL Detector Figure 2: 61-0190RK IR LEL Detector Component Location The infrared LEL detector is made up of a miniature infrared combustible gas LEL detector housed and encapsulated in a pipe nipple. The pipe nipple has 3/4” NPT threads on each end and a 1 1/4” hex that allows removal or installation of the detector with a wrench.
Oxygen Detector The detector consists of the oxygen sensor, the detector housing body, detector housing cap, and cap gasket. Detector Housing Body Cap Gasket Plug-in Oxygen Sensor Detector Housing Cap Flame Arrestor Guard Figure 3: Oxygen Detector Component Location Detector Housing Body The detector housing body protects the electronic components within the housing. Use the mounting threads at the top of the housing to screw the oxygen detector into the 3/4” NPT hub on the bottom of the junction box.
CO Detector The detector consists of the CO sensor, charcoal filter with rubber boot, detector housing body, detector housing cap, and cap gasket. Detector Housing Body Cap Gasket Plug-In CO Sensor Rubber Boot With Charcoal Filter Detector Housing Cap Flame Arrestor Guard Figure 4: CO Detector Component Location Detector Housing, Housing Cap, & Cap Gasket The detector housing body protects the sensing components within the housing.
H2S Detector The detector consists of the detector housing body, detector housing cap, cap gasket, rubber boot, spacer, and H2S sensor. Detector Housing Body Cap Gasket H2S Plug-in Sensor Spacer Rubber Boot Detector Housing Cap Flame Arrestor Guard Figure 5: H2S Detector Component Location Detector Housing, Housing Cap, & Cap Gasket The detector housing protects the sensing components within the housing. Use the mounting threads at the top of the housing to screw the H2S detector into a 3/4” NPT hub.
Conduit Seal The conduit seal isolates the volumes of the 2 junction boxes and preserves the explosion proof classification of each junction box. Junction Boxes Use the junction boxes to install the multi-point detector at a mounting site that is remote from the controller. The junction boxes protect the terminal strips and wiring connections made to the terminal strips. Use the top 3/4’’ conduit hub to connect wiring from the terminal strips to the controller.
.20 DIA X .45 Slot, (2X), mounting 7.75 3.15 2.40 3/4 NPT Hubs (4X) 3.11 .25 1.25 19.0 Max. H2S Detector CO Detector 3/4" NPT Nipple(2X) Conduit Seal LEL Detector 3.0 3.0 Oxygen Detector 1.
7.75 3.15 2.40 3/4 NPT Hubs (4X) Ø .20 X .45 Slot, (2X), mounting 3.11 .25 1.25 19.0 Max. CO Detector H2S Detector 3/4" NPT Nipple(2X) Conduit Seal IR LEL Detector 3.0 3.0 Oxygen Detector 1.10 Figure 7: Outline and Mounting Dimensions 65-2481RK-01 and 65-2481RK-02 2. At the mounting site you select, use #10 screws to mount the detector to a vertical surface. CAUTION: Mount the multi-point detector with the detectors facing down (see Figures 6-7).
Wiring the Multi-Point Detector to a Controller WARNING: Always verify that the power source is OFF before you make wiring connections. 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Remove the junction box cover from the top junction box. WARNING: To maintain the explosion proof classification of the multi-point detector, a conduit seal must be used within 18 inches of the junction box conduit hub used for wiring to the controller. 4.
BLK GRN LEL WHT RED CONTROLLER TER MIN ALS RED BLK H2S BLK RED CO WHT GRN OXY CONTROLLER TER MIN ALS RED BLACK BLACK RED RED GREEN WHITE GREEN WHITE BLACK H2S D ETEC TOR CO D ETEC TOR RED WHITE GREEN BLACK WHITE GREEN WHITE RED WHITE GREEN GREEN BLACK LEL D ETEC TOR OXYGEN D ETECTOR Figure 8: Wiring the 65-2481RK to a Controller 12 • 65-2481RK Multi Point Detector
BLK GRN LEL WHT RED CONTROLLER TER MIN ALS RED BLK H2S BLK RED CO WHT OXY GRN CONTROLLER TER MIN ALS RED BLACK BLACK RED RED WHITE GREEN BLACK GREEN WHITE H2S D ETEC TOR CO D ETEC TOR RED WHITE GREEN BLACK WHITE GREEN RED WHITE WHITE GREEN GREEN BLACK IR L EL D ETECTOR OXYGEN D ETECTOR Figure 9: Wiring a 65-2481RK-01 or 65-2481RK-02 to a Controller 65-2481RK Multi Point Detector • 13
9. Connect the cable’s 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. Start Up This section describes procedures to start up the multi-point detector and place the 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.
Maintenance This section describes maintenance procedures. It includes preventive maintenance, troubleshooting, and component replacement procedures. Preventive Maintenance This section describes a preventive maintenance schedule to ensure the optimum performance of the multi-point detector. It includes daily, monthly, and quarterly procedures. Daily At the controller, verify a display reading of: • 0 %LEL for combustible gas • 20.
NOTE: Ensure that you are using an appropriate calibration cylinder for the channel you are testing. 5. Use the calibration kit sample tubing to connect the regulator to the calibration cup. Performing the response test 1. Turn the regulator’s on/off knob counterclockwise to open the regulator. Gas will begin to flow. 2. Allow the gas to flow for two minutes, then verify that the reading is within ± 20% of the cylinder gas concentration.
Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the multi-point detector. NOTE: This troubleshooting guide describes multi-point detector problems only. See the controller operator’s manual for problems you may encounter with the controller. Table 2: Troubleshooting the Multi-Point Detector Condition Symptom(s) Probable Causes Recommended Action Fail Condition Controller indicates a fail condition.
Replacing Components of the Multi-Point Detector This section includes maintenance procedures for the LEL detector, the oxygen detector, the CO detector, and the H2S detector. Replacing the LEL Detector 1. Turn off the controller. 2. Turn off or unplug incoming power to the controller. 3. Remove the junction box cover from the bottom junction box. 4. Disconnect the detector leads from the terminal block in the junction box. Note the position of the color-coded leads as you remove them. 5.
6. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body. 7. Turn on or plug in power to the controller. 8. Turn on the controller and place into normal operation. CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step. 9. Calibrate the detector as described in “Calibration, O2 Detector” on page 25. Replacing the Oxygen Detector NOTE: In most cases, it is only necessary to replace the oxygen sensor.
CO Detector This section includes a procedure to replace the plug-in sensor, one to replace the charcoal filter, and one to replace the entire detector assembly. In most cases it is not necessary to replace the entire detector assembly. Replacing the Plug-In CO Sensor CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor when replacing it with a new one. If sensor electrolyte comes in contact with your skin, wash affected area thoroughly with soap and water. 1.
11. Turn on or plug in power to the controller. 12. Turn on the controller and place into normal operation. Replacing the CO Detector NOTE: In most cases, it is only necessary to replace the CO sensor. 1. Turn off the controller. 2. Turn off or unplug power to the controller. 3. Remove the junction box cover from the top junction box. 4. Disconnect the detector leads from the terminal block in the junction box. Note the position of the color-coded leads as you remove them. 5.
6. Install the spacer and rubber boot onto the replacement sensor’s face. 7. Carefully plug the replacement sensor into the socket pattern that is located in the detector housing. 8. Make sure the cap gasket is in place and screw the detector housing cap onto the detector housing body. 9. Turn on or plug in power to the controller. 10. Turn on the controller. CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step. 11.
applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months for the catalytic LEL, oxygen, H2S, and CO detectors and every 6 months for the infrared LEL detector.
Setting the Zero Reading 1. Follow the directions in the controller operator’s manual for setting the zero reading. 2. When the instructions call for applying zero air to the detector, turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow. 3. Allow the gas to flow for two minutes. 4. Turn the regulator’s on/off knob clockwise to close it. 5. Set the zero reading according to the controller operator’s manual. 6.
Calibration, O2 Detector This section describes how to calibrate the oxygen detector on the multi-point detector. It includes procedures to prepare for calibration, set the fresh air reading, set the zero reading, and return to normal operation. It describes calibration using a calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
connected to the regulator and the calibration cup. Setting the Zero Reading 1. Screw the regulator into the 100% nitrogen calibration gas cylinder. Make sure the regulator is off. It is off when the on/off knob is turned all the way clockwise. 2. Follow the directions in the controller operator’s manual for setting the zero reading. 3. When the directions call for exposing the detector to gas, turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow. 4.
Parts List Table 5 lists replacement parts and accessories for the multi-point detector. Table 3: Parts List Part Number Description 06-1248RK-03 Calibration kit sample tubing, 3 ft.
Table 3: Parts List Part Number Description 81-0018RK-03 Calibration cylinder, 50% LEL isobutane in air, 103 liter steel 81-0064RK-01 Calibration cylinder, 50 ppm CO in air, 34 liter steel 81-0064RK-03 Calibration cylinder, 50 ppm CO in air, 103 liter steel 81-0076RK Zero air calibration cylinder, 17 liter steel 81-0076RK-01 Zero air calibration cylinder, 34 liter steel 81-0076RK-03 Zero air calibration cylinder, 103 liter steel 81-0078RK-01 Calibration cylinder, 100% nitrogen, 34 liter 81-0
