2
MACURCO ND-1 (CONT.)
RESET
The reset feature is activated by pressing the switch labeled “RESET”. The switch is mounted on the printed
circuit board near the terminal block. Pressing the switch will initiate the warm-up cycle as mentioned above in
“OPERATION”.
STABILIZATION TIME
Although it will be operational within a few minutes of being first powered, the gas sensor in the ND-1
requires one hour to reach its final operating point. The ND-1
is intended to be continuously powered. If you are
certain that the air is clean and the ND-1 indicates a small reading, the zero potentiometer (just above the sensor
labeled “ZERO”) may be adjusted. Turn the screw about a quarter of a turn CCW at a time, while waiting 30
seconds between turns. This is a 25-turn potentiometer.
ALARMS DUE TO OTHER GASES
Although the ND-1 is specifically calibrated with NO
2
, the electro-chemical sensor will detect a variety of
gases such as Hydrogen Sulfide, Sulfur Dioxide, Chlorine, and Hydrogen Chloride. These gases may cause a
reading and relay actuations.
REPLACING THE SENSOR AND RECALIBRATING THE ND-1
Macurco provides a replacement sensor and a Field Calibration Kit for the ND-1. We recommend that the
sensor be replaced, and the unit be re-calibrated at least once every two years. The Field Calibration Kit can be
used to calibrate several units. The number of units that can be calibrated is determined by the gas quantity in the
gas cylinder. This will vary due to calibration kit useage and gas flow rate. However, the gas mixture has a useful
life of no more than one year.
SERVICING OF UNIT
The ND-1 does not require regular maintenance. The unit uses a self-purging electro-chemical sensor that has
a two year life expectancy. This sensor acts somewhat like a battery in that its output will be reduced with time.
The manufacturer of the sensor (City Technology Limited) indicates the sensor can be expected to have a reduced
output of up to 2% per month, but not to normally exceed 5% per year.
All maintenance and repair of products manufactured by Macurco, Inc. are to be performed at the Macurco
manufacturing facility. Macurco does not sanction any third-party repair facilities. Any attempted repair of a
Macurco product will void the products limited warranty.
LIMITED WARRANTY
The ND-1 gas detectors are warranted to be free from defective material and workmanship for a period of one
(1) year from the date of manufacture. If any component becomes defective during the warranty period, it will be
replaced or repaired free of charge, if the unit is returned in accordance with the instructions below. This warranty
does not apply to units that have been altered or had repair attempted, or that have been subjected to abuse,
accidental or otherwise. The above warranty is in lieu of all other express warranties, obligations or liabilities.
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE ARE
LIMITED TO A PERIOD OF ONE (1) YEAR FROM THE PURCHASE DATE. Macurco shall not be liable for
any incidental or consequential damages for breach of this or any other warranty express or implied arising out of
or related to the use of said gas detector. Manufacturer or its agents liability shall be limited to replacement or
repair as set forth above. Buyer’s sole and exclusive remedies are return of the goods and repayment of the price,
or repair and replacement of non-conforming goods or parts. (The Uniform Commercial Code applicable in the
State of Colorado shall govern.)
RETURN INSTRUCTIONS
Call (303) 781-4062 for a Return Authorization number. Then, carefully pack the gas detector with a written
description of the nature of the return. Send the unit to the following address:
Macurco Inc.
3946 South Mariposa Street
Englewood, Colorado 80110
WWW.MACURCO.COM
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