Vaisala 26150GM Quick Reference Manual

Quick Reference Guide
Field Check Adapter
26150GM
– Tool for easy field checking
– Compatible with Vaisala AMMONICAP
Ammonia Detector Series AMT100 and
®
Vaisala CARBOCAP Carbon Dioxide Probes
Series GM220
FIELD CHECK OF AMMONIA DETECTORS
The performance of the Vaisala AMMONICAP
Detector Series AMT100 can be checked on site with ammonia
gas. A field check ensures the detector is functioning and the
sensor responds to ammonia gas.
During the field check, the sensor is purged using a reference gas
with a known ammonia concentration. The ammonia gas causes
alarm signals (in the case of AMT100 Series, led lights) to turn
on, thus indicating that the detector is functioning.
Note that a field comparison can only check the performance of
the detector. For accurate calibration and adjustment, the probe
or the detector should be returned to Vaisala Service (see table
on the reverse side).
Field Check Equipment
To perform a field check, certified calibration gas, a pressure
regulator, a field check adapter, and flexible tubes (preferably
teflon) with inner diameters of 4 mm and 6 mm are required.
Reference gas, pressure regulators and the field check adapter
can be ordered from Vaisala with the following order codes:
• Ammonia reference gas 100ppm
• Ammonia reference gas 300ppm
• Pressure regulator
• Field check adapter
100 ppm reference gas is recommended for probes with a 0...100
ppm measuring range. For probes with a 0...1000 ppm measuring
range, the 300 ppm reference gas is recommended.
The gas bottles contain 34 liters of ammonia compressed into a
small and light (1 lb/0.44kg) container. The bottles are not
refillable. The pressure regulator, however, can be used again.
®
Field Check Instructions
1. Turn the detector to SERVICE MODE either by pressing the
button or via the serial line connection. When the detector is in
service mode, the operation light is blinking.
2. Place the field check adapter onto the probe.
3. Connect the reference gas bottle to the adapter inlet (at the
bottom of the adapter) with flexible tubing. The diameter of the
gas outlet pipe is 6 mm, and the diameter of the field check
adapter's inlet is 4 mm.
4. Open the bottle valve and let the reference gas flow through
®
Ammonia
the adapter. The regulator's preset flow rate is 0.5 l/min.
5. Let the gas flow for 2...5 minutes. (If you want to check the
exact reading or if the reference concentration is very close to
the alarm level, let the gas flow for at least 5 minutes to establish
a stabilized environment.)
6. The low level and high level leds are lit as the ammonia
concentration on the sensor exceeds the two alarm setpoint
levels. This indicates that the detector reacts to ammonia and that
the alarms are functioning.
7. On completion, close the bottle valve and detach the adapter
from the probe.
8. When the readout has dropped below the alarm levels, turn the
detector back to normal operation mode by pressing the
SERVICE MODE button.
210374
210375
210376
26150GM
Field checking ammonia detector.
M210450en-A