Teledyne 2240 - Portable Handheld Hydrogen Leak Detector, 3rd generation (revision 2/29/08) - Manual (Page 25)

Handheld Hydrogen Leak Detector Field Verify/Calibration
Teledyne Analytical Instruments 15
Field Verification and Calibration
3.1 Gases
Verification or calibration requires the availability of the following
certified gases:
• 2.00% hydrogen by volume in air (20,000 ppm)
• 0.1% hydrogen by volume in air (1000 ppm)
• Zero grade, hydrogen-free air, ambient air can be used instead
of certified zero grade air if the user has high confidence that it
is a hydrogen-free environment.
3.2 Gas Connection
Gases are applied to the unit thru the use of the Calibration Cup
Assy. (P/N 50000009) available from manufacturer.
3.3 Numerical Changes
In the following sections when queried to change a numeric value
the ▲ (up arrow) and ▼ (down arrow) keys are used to
increment/decrement the value based on the selected digit. If the ones
digit is selected the value will increment/decrement by one (9
increments to 10, 10 decrements to 9). The ◄ (left arrow) and ►
(right arrow) keys are used to select another digit. To change a value of
0 to 100 first select the hundreds digit then press the ▲ up arrow.
Pressing ◄ ► (the left and right arrows simultaneously) will clear any
changes made and restore the previous value. Once the correct value is
displayed press the ENTER key to save it.
3.4 Verify Sensor
The Verify function allows the user to check the instrument’s
calibration. If Verify is successful then the user is asked to enter the new