Det-Tronics UD10 DCU Emulator FlexVu Universal Display Unit - Manual (Page 50)

4.2 J-3 95-8656
orientAtion
The UD10-DCU/NTMOS assembly must be mounted
with the detector pointing down (see photo below).
cAlibrAtion
Calibration Notes
The NTMOS sensor must be calibrated using 50 ppm
H
2
S in air (never use H
2
S in nitrogen).
Det-Tronics provides two acceptable sources of 50
ppm H
2
S calibration gas for use with NTMOS sensors.
WarnIng
The use of any other H
2
S calibration mixture will
produce inaccurate calibration results, possibly
resulting in a dangerous condition if the sensor
under-reports the level of H
2
S.
1. 50 ppm Ampoule Calibration Kit (p/n 007098-005)
with 50 ppm ampoules (p/n 225741-001)
To operate the Ampoule Calibrator:
– Remove the cover and insert a 50 ppm H
2
S
ampoule into the ampoule holder inside the
calibrator. Tighten the thumb screw until snug.
– Place the cover back on the calibrator and
connect it snugly to the NTMOS sensor.
– Tighten the thumb screw until the ampoule
breaks.
– Rotate the mixing fan by slowly turning the mixing
fan lever.
2. Humidification Tube Calibration Kit (p/n
010272-001) with bottled 50 ppm H
2
S in air (p/n
227117-014). For complete information regarding
use of the Humidification Tube Calibration Kit,
refer to Instruction Manual number 95-8648.
noTe
When calibrating with bottled 50 ppm H
2
S in air,
the humidification tube must be used.
FLEXVU UD10
NTMOS H2S SENSOR
AMPOULE CALIBRATOR
THUMB SCREW
MIXING FAN LEVER
Ampoule Calibrator Attached to NTMOS Sensor