RKI 65-2515RK Oxygen Detector User Manual

RKI 65-2515RK Oxygen Detector User Manual

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. Typical calibration frequencies for most applications are between 3 and 6 months, but can be required more often or less often based on your usage.

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 orreplace , at our option, free of charge. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis. Examples of such items are:

• a) Absorbent cartridges d) Batteries
• b) Pump diaphragms and valves
• e) Filter elements
• c) Fuses

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair procedures not in accordance with the operator’s manual. This warranty indicates the full extent of our liability, and we are not responsible for removal or replacement costs, local repair costs, transportation costs, or contingent expenses incurred without our prior approval.

AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC. BE LIABLE FOR INDIRECT, INCIDENTAL,  ORCONSEQUENTIAL LOSS OR DAMAGE OF ANY CONNECTED WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY

This warranty covers instruments and parts sold to users by authorized distributors, dealers, and representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of this gas monitor, and our warranty is limited to the replacement of parts or our complete goods.

Overview

This manual describes the 65-2515RK oxygen detector (internal amplifier type). This manual also describes how to install, start up, maintain, and calibrate the detector when used with a gas monitoring controller. A parts list at the end of this manual lists replacement parts andaccessories for the oxygen detector.

Specifications

Table 1 lists specifications for the 65-2515RK oxygen detector.

Table 1: 65-2515RK Specification

oxygen nominal
Response Time| 90% in 30 seconds
Area Classification| Explosionproof for Class I, Groups B, C, and D
Temperature Code| T6
Installation Category| Installation Category 1. Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than Installation Category (Overvoltage Category) II (ref. IEC 664).
Operating temperature| -20° C to 45° C
|

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 65-2515RK, you must follow the instructions and warnings in this manual to assure proper and safe operation of the 65-2515RK and to minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2515RK as described in this manual.

Description

This section describes the components of the 65-2515RK. It consists of the oxygen detector and the junction box

Oxygen Detector

The oxygen detector consists of the detector housing and the plug-in sensor.

Figure 1: Oxygen Detector Component Location

Detector Housing

The detector housing protects the sensing components within the housing. Use the mounting threads at the top of the housing to screw the oxygen detector into the bottom conduit hub of the junction box. Use the removable cap near the bottom of the housing to access the sensor for maintenance or replacement. The cap protects the sensor from damage and includes a flame arrestor which contains any sparks that may occur within the detector housing. A cap gasket seals the interface between the housing body and cap. The flame arrestor guard protects the flame arrestor from impact damage and is permanently bonded to the cap.

Two color coded wires extend from the top of the detector housing. Use these wires to connect the oxygen detector to a controller via the terminal block in the junction box. The detector housing includes two sockets installed on a circuit board. These sockets accept the plug-insensor’s two pins to secure the sensor within the detector housing. The circuit board with the sockets conditions the sensor’s signal before it exits the detector housing via the two color coded wires

Plug-In Sensor

The plug-in sensor plugs into a circuit board in the detector housing with two pins and is retained by the cap. Through a series of chemical and electrical reactions, the sensor produces an electrical output that is proportional to the detection range of the oxygen detector.

Junction Box

The junction box allows you to install the oxygen detector at a mounting site that is remote from a controller and it protects the detector wiring connections. Two conduit hubs allow you to mount the oxygen detector to the junction box and route the wiring from the detector to a controller. Three spacers installed on the back of the junction box control the distance of the junction box from a mounting surface and ensure that there is enough room to install a calibration cup on the detector during calibration.

A terminal block within the junction box facilitates the wiring process. A cover on the front of the junction box allows access to the interior of the junction box

Installation

This section describes procedures to mount the oxygen detector in the monitoring environment and wire the detector to a controller.

Mounting the Oxygen Detector

1. Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site.

   • Select a site where the detector is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
   • Select a site that is at normal breathing level.
     
     Figure 2: 65-2515RK Outline & Mounting Dimensions
     NOTE:The oxygen detector in the 65-2515RK is normally provided with an Adalet XIHSCFC3 junction box rated explosion proof for Class I, Groups B, C, and D. This combination is shown in Figure 2 above. Any junction box with an internal volume less than or equal to 69 cubic inches and rated explosion proof for Class I, Groups B,
     C, and D may be used for this detector.

2. At the mounting site you select, hang or mount the junction box with the detector facing down (see Figure 2

**Wiring the Oxygen Detector to a Controller

**

WARNING: If the controller’s construction is not explosion-proof, the controller must be installed in an ordinary location. Do non install a non- explosion-proof controller in a classified location. Turn off the controller.

3. Turn off or unplug power to the controller.

4. Remove the junction box cover.

5. Guide a two-conductor, shielded cable or two wires in conduit through the unused conduit hub of the junction box.
   WARNING: To maintain the explosion proof classification of the oxygen detector/junction box combination, a conduit seal must be used within 18 inches of the detectorjun ction box conduit hub used for wiring to the amplifier. Do not install the detector in an environment with acetic acid. Adhere to your local electrical code when installing the conduit seal.

6. Connect the wires to the terminals opposite the detector leads using the terminal strip in the junction box
   CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the detector. You will connect the opposite end of the cable’s drain wire at the controller

7. Reinstall the junction box cover to the junction box.

8. Route the cable or wires leading from the oxygen detector through one of the conduit hubs at the controller housing
   CAUTION: Do not route power and detector wiring through the same conduit hub. The power cable may disrupt the transmission of the detector signal to the controller

9. Connect the wires to the applicable controller terminal strip as shown in Figure 3 below. See the controller operator’s manual and the controller’s detector head specification sheet for wiring information specific to a controller.
   
   Figure 3: Wiring the Oxygen Detector to a Controller

10. If using shielded cable, connect the cable’s drain wire to an available chassis ground at the controller. RKI controllers typically have a ground stud that is a convenient grounding location.

Start Up

This section describes procedures to start up the oxygen 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. Refer to the controller operator’s manual.
3. Turn on or plug in the incoming power to the controller, then turn on the controller.
4. Verify that the controller is on and operating properly. Refer to the controller operator’s manual

CAUTION: Allow the detector to warm up for 5 minutes before you continue with the next section, “Verifying/Setting the Fresh Air Reading”.

Verifying/Setting the Fresh Air Reading

ARNING: Do not remove the detector housing cap or junction box cover while the circuits are energized unless the area is determined to be non- hazardous. Keep the detector housing cap and junction box cover tightly closed during operation.

NOTE :If you can verify that the detector is in a fresh air environment (environment known to be of normal oxygen content and free of toxic and combustible gases), it is not necessary to apply zero air when verifying or setting the fresh air reading.

The procedure below describes applying zero air 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

1. Screw the calibration cup onto the bottom of the oxygen detector.

2. Screw the regulator into the zero air calibration cylinder.

3. Use the sample tubing to connect the regulator to the calibration cup.

4. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.

5. Allow the gas to flow for two minutes.

6. Verify a reading of 20.9% oxygen at the controller. If the display reading is 20.9% oxygen, the oxygen detector is in normal operation and start up is complete. Proceed to step 7 to disassemble the calibration kit. If the display reading is not 20.9% oxygen, set the fresh air reading according to the
   controller’s operator’s manual.

7. Turn the regulator’s on/off knob clockwise to close it.

8. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave the sample tubing connected to the regulator and the calibration cup.

9. Unscrew the regulator from the cylinder and remove the calibration cup from the detector.

10. Store the components of the calibration kit in a safe and convenient place.

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 oxygen detector. It includes daily and quarterly procedures.
Daily
Verify a display reading of 20.9% oxygen at the controller. Investigate significant changes in the reading.
Quarterly
Calibrate the detector as described in “Calibration” on page 15.

Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the oxygen detector

NOTE:This troubleshooting guide describes detector problems only. See the controller operator’s manual for problems you may encounter with the controller

Table 2: Troubleshooting the Oxygen Detector

Condition| Symptom(s)| Probable Causes|

Recommended Action

---|---|---|---
Fail Condition|

• Controller indicates a fail condition.

|

• The detector wiring is disconnected or misconnected.
• The plug-in oxygen sensor is not properly installed.
• The detector is malfunctioning.

|

1. Verify that the detector wiring is correct and secure.
2. Confirm that the plug-in oxygen sensor inside the detector housing is installed properly.
3. Calibrate the detector.
4. If the fail condition continues, replace the plug-in oxygen sensor.
5. If the fail condition continues, contact RKI for further instruction.

Slow or No Response/ Difficult or Unable to Calibrate|

• Unable to accurately set the fresh air or zero reading during calibration.
• Detector requires frequent calibration.

Note: Under “normal” circumstances, the detector requires calibration once every three months.

|

 The calibration cylinder is low, out- dated, or defective.

• The plug-in sensor is malfunctioning.

|

1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.
2. If the calibration/response difficulties continue, replace the plug-in sensor.
3. If the calibration/response difficulties continue, contact RKI for further instruction.

|

Some applications may require a more frequent calibration schedule.

| |

Replacing the Oxygen Plug-in Sensor

1. Turn off the controller.

2. Turn off or unplug incoming power to the controller.

3. Unscrew the detector housing cap from the detector housing.

4. Unplug and remove the oxygen sensor.

5. Carefully plug the replacement sensor into the socket pattern that is located in the top section of the detector housing
   NOTE: Match the sensor’s male pins with the two female sockets as you plug the sensor into the sockets.

6. Screw the detector housing cap onto the detector housing.

7. Turn on or plug in incoming power to the controller.

8. Turn on the controller
   CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step

9. Calibrate the replacement sensor as described in “Calibration” on page 15.

Replacing the Oxygen Detector

NOTE: In most cases, it is only necessary to replace the plug-in oxygen sensor.

1. Turn off the controller.

2. Turn off or unplug incoming power to the controller.

3. Remove the junction box cover.

4.  Disconnect the detector leads from the terminal block inside the junction box. Note the position of the color-coded leads as you remove them.

5. Unscrew the detector from the junction box.

6. Guide the detector leads of the replacement detector through the bottom conduit hub of the junction box, then screw the mounting threads of the detector into the conduit hub.

7. Wire the detector leads to the terminal block in the same position as the leads you removed in step 4.

8. Reinstall the junction box cover.

9. Turn on or plug in incoming power to the controller.

10. Turn on the controller
    CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step.

11. Calibrate the replacement detector as described in “Calibration” on page 15.

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 applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months (quarterly).

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

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 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.

WARNING: The controller is not an active gas monitoring device during the calibration procedure.

Preparing for Calibration

NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the controller into its calibration program or disable external alarms before calibrating

1. Screw the calibration cup onto the bottom of the oxygen detector.

2. Screw the regulator into the zero air calibration cylinder.

3. Use the sample tubing to connect the regulator to the calibration cup.
   NOTE: If you can verify that the oxygen detector is in a fresh air environment, you do not need to apply zero air to the detector before adjusting the zero reading.

4. Put the controller into its calibration program.

Setting the Fresh Air Reading

1. Follow the directions in the controller operator’s manual for setting the fresh air reading.
2. When the instructions call for applying zero air to the detector, turn the regulator’s on/off knob counterclockwise to open it. Zero air will begin to flow.
3. Allow the gas to flow for two minutes
4. Set the fresh air reading according to the controller operator’s manual.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing connected to the regulator and the calibration cup.

Setting the Zero Reading

1. Screw the regulator into the calibration gas cylinder, normally 100% nitrogen.
2. Follow the instructions in the controller’s operator’s manual for setting the oxygen zero reading.
3.  When the instructions call for exposing the detector to gas, normally 100% nitrogen, turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
4. Allow gas to flow to the detector for two minutes.
5. Set the zero reading according to the controller operator’s manual.
6. Turn the regulator’s on/off knob clockwise to close it.
7. Unscrew the regulator from the cylinder.
8. Remove the calibration cup from the detector. For convenience, leave the calibration cup and regulator connected by the sample tubing.

Returning to Normal Operation

1. Allow about 45 seconds for the oxygen reading to increase above the decreasing alarm point and return the controller to normal operation.
   NOTE: If you do not allow the oxygen reading to increase above the decreasing alarm point, then unwanted alarms may occur

2. Verify that the controller display reading increases and stabilizes at 20.9% oxygen.

3. Store the components of the calibration kit in a safe and convenient place.

Parts List

Table 3 lists replacement parts and accessories for the oxygen detector.

Table 3: Parts List

classified (does not include junction box)
65-2515RK| Oxygen detector/junction box, CSA classified
71-0137RK| 65-2515RK Oxygen Detector Operator’s Manual (this document)
81-0076RK-01| Zero air calibration cylinder, 34 liter steel
81-0078RK| Calibration cylinder, 100% nitrogen, 17 liter
81-0078RK-01| Calibration cylinder, 100% nitrogen, 34 liter steel
81-1050RK| Regulator with gauge and knob, 0.5 LPM, for 17- and 34-liter steel calibration cylinders (cylinders with external threads)
81-1117RK| Calibration cup
81-F301RK-LV| Calibration kit (34 liter)

Documents / Resources

| RKI 65-2515RK Oxygen Detector [pdf] User Manual
65-2515RK, Oxygen Detector
---|---

References

• RKI Gas Detectors - Portable Gas Monitors - LEL, PID, H2S, CO, O2 Sensors

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