Macurco ND-2 Manual

Nitrogen dioxide detector field calibration kit

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MACURCO GAS DETECTORS

Nitrogen Dioxide Detector Field Calibration Kit

ND-2

CONTENTS OF THE KIT:

1. Gas Cylinder of 5 ppm Nitrogen Dioxide (NO

)

2. Gas regulator with about two feet of plastic tubing

3. Calibration hood

4. These instructions

GENERAL INFORMATION:

All the Macurco Nitrogen Dioxide detectors are factory calibrated when they are shipped to the customer. This

calibration should be within specifications for 6 months to a year. Some jurisdictions, local standards, or customer

preferences require periodic recalibrations. This Kit provides the means to fit those requirements. Macurco

recommends checking the operation of the the Macurco Nitrogen Dioxide detector every six months, either through use

of the procedures given in the operating instructions or this Field Calibration Kit.

ND-2 FIELD CALIBRATION PROCEDURE:

NOTE: The ND-2 must have been power continuously for a minimum of 72 hours before proceeding

Calibration Equipment Needed

1.0 5ppm canister of Nitrogen Dioxide (NO

)

2.0 Digital multimeter, and set to DC volts, adjust for best resolution range (i.e. 2V)

3.0 Second meter set to milliamps to 20mA range

Preparation

1. Open the access door of the ND-2 case

2. Remove the two bottom screws that secure the interior faceplate, and swing the faceplate up.

3. Ensure that the digital display is "ON" before starting.

4. Turn "FAN" adjustment fully clockwise before proceeding.

Calibration

1.0 Connect meter leads across TP (Red lead + connects to the looped lead, nearest to display)

2.0 Adjust RA5 Zero mult-turn 25KΩ pot, until voltmeter reading is close to 0.00V (+/-0.06V) and adjust the

milliamp output to 4.0mA +/- .03 via RA3

Rev: 08/01

Page 1 4. These instructions GENERAL INFORMATION: All the Macurco Nitrogen Dioxide detectors are factory calibrated when they are shipped to the customer. This calibration should be within specifications for 6 months to a year. Some jurisdictions, local standards, or customer preferences require periodic recalibrations. This Kit provides the means to fit those requirements. Macurco recommends checking the operation of the the Macurco Nitrogen Dioxide detector every six months, either through use of the procedures given in the operating instructions or this Field Calibration Kit.
Page 2 3.0 Wait for reading to stabilize (capacitors cause readings to slightly lag) 4.0 Repeat steps 2 and 3 until meter reading is stable 5.0 Apply the NO via the regulator to NO sensor adapter cap a. Set meter for 20V range while applying gas 6.0 Wait for the meter reading and display to start rising (this may take several minutes).