D. MEASUREMENT TECHNIQUES
2. Step by Step Procedures:
WARNING!
Turn the 719 in a “clean air” environment away from the
test area.
1.
Turn the 719 on by turning the thumbwheel counter clockwise.
The 719 will begin sounding a maximum tick rate and the
alarm will warble.
Allow the 719 to warm up. This typically takes 30 seconds
but can take as long as 10 minutes depending on the ambi-
ent temperature. As the 719 warms up, the alarm will stop
and the tick rate will reduce.
2.
After the warm up period is complete, use the thumbwheel to
set a consistent tick rate. The alarm LED will flash with the tick
rate. Approach suspected leak areas with the sensor until the
tick begins to increase. When the tick increases, do not move
the sensor from the area, rotate the TICK ADJUST slightly
counterclockwise to slow the ticking and continue to approach
the suspected leak area with the sensor. Continue to slow the
tick until the location of the leak is found. If the tick stops, the
concentration level has decreased. Move back in the opposite
direction to find the leak again.
3.
If the leak concentration is above the alarm level the alarm will
sound and LED’s located in the front panel and sensor cage
will flash.
9
8
D. MEASUREMENT TECHNIQUES
1. Controls and Functions (continued):
Instrument Layout
Keypad
Gooseneck
Sensor cage containing
the sensor and visual
alarm indicator
Speaker
Alarm LED
On Indicator
Tick adjust wheel
Earphone
Jack
719 manual_102808.qxd 10/30/2008 2:26 PM Page 8
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