RKI Instruments NP-204 Instruction Manual
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RKI Instruments NP-204 Instruction Manual

Portable methane gas detector
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INSTRUCTION MANUAL
Model NP-204
PORTABLE METHANE GAS DETECTOR
The accompanying instrument is sold and serviced in the USA by RKI Instruments, Inc. Please contact
R KI Instruments for any follow up service needs, including questions, warranty issues, repairs, and spare
parts and sensors. Thank you for selecting this fine instrument for your use. With proper care and
maintenance, it will provide you with many.

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Summary of Contents for RKI Instruments NP-204

  • Page 1 Model NP-204 PORTABLE METHANE GAS DETECTOR The accompanying instrument is sold and serviced in the USA by RKI Instruments, Inc. Please contact R KI Instruments for any follow up service needs, including questions, warranty issues, repairs, and spare parts and sensors. Thank you for selecting this fine instrument for your use. With proper care and...

  • Page 2: Table Of Contents

    NP-204 RKI Instruments, Inc. Table of Contents INTRODUCTION ..............

  • Page 3: Introduction

    RKI Instruments, Inc. INTRODUCTION The Model NP-204 is a proven gas detection instrument, in use internationally for detection of natural gas levels over the full range of concentrations. The NP-204 is compact, easy to use, and offers the following features: •...

  • Page 4: Description

    (methane) levels over a wide range.The two ranges, 0-5% by volume and 0-100% by volume, are displayed on a built in analog meter. The NP-204 utilizes a rubber aspirator bulb for drawing of a test sample through a hose and probe. Typical uses are to test for gas levels in wells or pipelines at landfills, natural gas handling plants, or other natural gas delivery systems.

  • Page 5: Control Panel

    % Gas concentration. Control Panel The control panel is at the top of the instrument for easy access when the NP-204 is carried. It contains the display, range lights, and switches that control the functions of the NP-204. The switches are “lift to turn”...

  • Page 6: Battery Compartment

    Battery Compartment The NP-204 battery compartment is located on the bottom of the instrument. It has a removable panel for easy replacement of the batteries. The panel is held in place by one screw located on the bottom of the instrument.

  • Page 7: Operation

    NP-204 RKI Instruments, Inc. OPERATION P r e p a r a t i o n Normally the NP-204 requires very little preparation before use. Before using the instrument, follow the steps listed below: Start-up Mechanical Zero Before turning the instrument on, set it on a flat surface and verify that the meter reading is exactly on zero.
  • Page 8 Operation section of this manual below. Normal Operation The NP-204 can now be used to check atmospheres for gas levels. Before each sample is taken, the user should follow the following steps: Turn unit on to Volt Adj., and adjust voltage to the red Volt Check line on the meter, using the Volt Adjust knob.

  • Page 9: Alarms

    The NP-204 contains no audible or visual alarms. CALIBRATION AND MAINTENANCE The NP-204 requires only a few user adjustments. These are the zero and span for the low range and high range sensors. The Low range span should be checked periodically ( preferably every use for critical applications).

  • Page 10: Calibration Supplies And Equipment

    NP-204 RKI Instruments, Inc. Calibration Supplies and Equipment To adjust the NP-204, you will need the following supplies and equipment, some of which is available in an RKI Calibration Kit: • Known calibrating sample of 2.5% Volume (50% LEL) natural gas (methane) in air.

  • Page 11: Maintenance

    Replace the batteries if the voltage cannot be set to the Volt check line. WARNING Take the NP-204 to a non-hazardous location before replacing the batteries. The batteries are located in a compartment on the bottom of the case. To replace the batteries, loosen the screw on the bottom of the case, and remove the battery compartment cover.
  • Page 12 The high range cannot be set to zero after warmup using the internal ZERO (H) potentiometer. Sensor Replacement Take the NP-204 to a non-hazardous location and turn the power off. Remove the instrument from the carrying case. Loosen the two large screws on the top face of the instrument, lift the top half of the case away from the bottom case, and lay the top case upside down on the workbench.
  • Page 13 NP-204 RKI Instruments, Inc. Remove the two screws holding the U shaped bracket which secures the TC sensor filaments into the sample chamber. Remove the bracket and pull the sensor filaments from the chamber. Install the replacement filaments into the chamber. Insure that the filaments with the black and white wires are installed into the hole closest to the corner of the instrument.

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