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Summary of Contents for RKI Instruments OX-94
- Page 1 INSTRUCTION MANUAL RKI INSTRUMENTS, INC. MODELS: OX-94, CO-94, HS-94 PORTABLE SINGLE GAS MONITORS RKI Instruments, Inc. 33248 Central Ave. Union City, CA 94587 (510) 441-5656...
- Page 2 INTRODUCTION The RKI Models OX-94, CO-94, and HS-94 (the 94 series) are compact portable gas detection instruments. They are designed to protect the worker from dangerous gas levels, and are also intended to be used as survey tools to determine gas levels in a workspace or other confined space.
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Page 3: Instrument Type
These instruments are easy to adjust and maintain, with user replaceable batteries and diffusion sensors. INSTRUMENT TYPE GAS DETECTED RANGE OX-94 Oxygen 0-40% volume CO-94 Carbon Monoxide 0-500 ppm... -
Page 4: Control Panel
Oxygen Sensor The oxygen sensor is an electrochemical cell, consisting of gold and lead electrodes in an alkaline electrolyte. A fluorocarbon membrane covers the cell, and allows atmosphere to diffuse into the electrolyte at a rate proportional to the partial pressure of oxygen. -
Page 5: Circuit Boards
2. Verify Operation To easily verify operation of the OX-94, breathe out over the diffusion sensor on the top of the instrument. The oxygen reading should drop to about 18%, the audible alarm for Oxygen deficiency should sound, and the display reading should blink. - Page 6 WARNING If the Instrument does not respond to these verifications, take it to a known “fresh-air” environment, then follow the zero and calibration procedures in this manual. Repeat the Verify Operation procedure before using the Instrument in a potentially hazardous location. 3.
- Page 7 Note The 94 series automatically checks battery voltage during start-up; if the measurement is below 2.1V, the instrument will not operate. During normal operation, when the battery voltage drops to 2.0V, the battery sign will blink on the display, a continuous alarm tone will sound, and the display will show a blinking battery.
- Page 8 5. Alarms Gas Level Alarms The 94 Series instruments have standard alarm points as listed below: OX-94 19.5% decreasing, 23.5% increasing CO-94 25 ppm increasing, 25 ppm TWA, 400 PPM STEL HS-94...
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Page 9: Calibration And Maintenance
HS-94 25 ppm H2S in nitrogen or in air. CO-94 50 ppm CO in nitrogen or in air. OX-94 100 % nitrogen. Entering Calibration Mode: To access calibration mode on the 94 series instruments, the unit must be initially turned on a special way. - Page 10 2. While continuing to hold the AIR Button, press also the MODE button until instrument beeps. 3. After the beep, release the MODE button but continue to hold the AIR button for a few seconds until the display completes warmup and reads the gas concentration.
- Page 11 30 or 60 (for H2S) or 150 (for CO). Once you have scrolled to the value of your calibration gas, go to step 9. 9. Press the MODE switch, and the instrument should read the gas levels in the surrounding air. Now apply the span gas to the instrument using an appropriate test cup to fit over the sensor area.
- Page 12 6. Turn on the instrument and verify the display is normal. 7. Calibrate the detection circuit to work correctly with the new sensor (see Calibration). For issues not covered in this manual, or for any questions or problems, please contact RKI Instruments, Inc., at 800-RKI-5165.
- Page 13 PRODUCT WARRANTY 1 / 1 / 2 0 0 2 RKI Instruments, Inc. warranties gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from the date of shipment from RKI Instruments, Inc.
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