SENSIT®VMD
QUICK-START INSTRUCTIONS
1. Install the VMD on the “L” bracket. Be sure
that the pin is secure and the “jam bolt”
is tight. Connect the power harness to
the VMD and power the tablet on. Press
“power on” located in the bottom left corner
of the screen (or F1) to power unit on.
2. Allow unit to go through the warm-up
sequence in clean air (area known to
be gas-free). At the end of the warm up,
the screen will display “next calibration
due” or “calibration due.” Acknowledge
the prompt accordingly. Warm-up
typically requires 8 to 10 minutes.
3. If “zero fail” is displayed, move to a different
location and press the “zero” button (F2). If
“low light” is displayed, clean the lenses to
remove condensation, dirt or debris. Press
the “zero” button (F2) to clear “low light.”
4. For surveys on low pressure gas systems,
use the VMD on a lower position on the
“L” bracket. Refer to the user manual
for survey and transport positions.
5. The VMD alarm is preset to 10ppm/m. This
is adjustable in the “user setup” tab. Hint: to
nd very small leaks, set alarm to 3ppm/m.
6. If operating as a coupled system (VMD and
PMD), the PMD will transmit data to the table
via Bluetooth (if paired). If either instrument
exceeds the preset alarm point, the readings
will display in red with an audible tone
and a peak value will show on the chart.
7. To start a survey, press “start
survey” (F4). A logging le will be
created, date and time stamped.
8. To pause a survey, press “pause” (F5).
To restart survey, press “restart” (F5).
9. To stop a survey, press “stop survey”
(F4). Hint: Stopping a survey closes the
log le. Starting a survey will create
a new le. Surveys can be grouped
by day, zones, or other user dened
parameters by pausing and restarting.
10. The VMD has an internal test cell. This
test can be executed while the vehicle is
in motion or stopped. Press “test” (F3) to
drop the cell internally in the light path and
display a reading. The display will indicate
PASS or FAIL in the upper right corner.
11. If the VMD display shows a negative
number for a period of time, press the “zero”
button (F2) to set a new zero baseline.
12. The chart displays 2 minutes of data
(default programming). Press “clear chart”
to clear the screen. Note that “clear chart”
does not permanently delete data but
simply clears the chart’s peak readings.
13. To calibrate, a survey must be stopped
(if active). Press the “calibrate” button.
It will prompt the user to “insert the
calibration cell into the light path.” Attach
by hanging the cell on the bar against
the transmitter (light side) or receiver side,
line up and lightly tighten the thumb screw.
Be sure that the housing of the calibration
cell is not obstructing the light. Press OK
on the computer. The unit will display
readings in blue. The display will show
“READY” or “FAIL” in 10 to 15 seconds.
14. The tablet incorporates a Microsoft-based
operating system. To power off the VMD
and Tablet, press “shutdown” (F1). A
prompt will appear to conrm shut down.
Press “yes.” Press the “close” button in
the upper left corner of the display. Then
follow the windows shutdown procedure.
DO NOT DISCONNECT POWER TO
THE TABLET WHEN POWERD ON,
CORRUPTION OF THE IMAGE MAY
OCCUR.
