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
)
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
)
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 25K
Ω
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
