Manometer & Tightness Test Mode (Continued)
The tightness test function enables the 712 to check for pressure leaks in
valves, fittings, and pressure switches with an elapsed time reference.
1. Activate the manometer function and perform steps 1 through 3 outlined
on page 21.
2. Press the Store/Logger key, ‘stor’ and ‘titn’ will display. Using the Arrow
keys select ‘titn’ and press the Scroll/Enter key. The display will read ‘Addr’
and an address location between 0 and 49 will blink. Use the Arrow keys to
select the address location to store the tightness test. Press the Scroll/Enter
key.
3. After address selection, the tightness test will begin. The top display will
read the start pressure (P1). The middle display will read ‘titn’, and the bot-
tom display will show the elapsed time in minutes and seconds (mm.ss).
4. The countdown display will begin to blink at the one minute mark. Press
the Scroll/Enter key.
5. The middle display will show the start pressure (P1) and the top display
will show the stop pressure (P2). The bottom display will continue to show
the elapsed time.
6. The elapsed time display will begin blinking at the two minute mark. Press
the Scroll/Enter key.
7. The bottom display will show the stop pressure (P2) and the middle dis-
play will read the start pressure (P1). Both displays will blink indicating the
tightness test is over.
8. Press the Scroll/Enter key and the test will be saved in the address location
selected in step 4.
9. “End” will be displayed. Using the Up and Down Arrow keys, select “YES”
if you are finished performing tightness tests, or select “NO” if another test is
to be performed. Press the Scroll/Enter key. The pump will begin to run again
regardless of selection. To turn the pump off again, press and hold the Up
Arrow key down until the pump turns off.
Use the Recall and Print keys to review and print tightness tests. Please refer
to pages 25 & 26.
23
Manometer & Tightness Test Mode
With the analyzer running, press the Func Key repeatedly to access the
manometer function. The pump automatically turns off during this function.
1. Ensure you have Pressure Sampling Tube connected to one or both of the
Pressure Ports and there are no restrictions in the tubing (see figure below)
2. Zero the display by pressing the Down Arrow Key.
3. Connect the tube(s) to the device under test and read the pressure on the
display.
4. Reactivate the pump if a combustion test is being performed at the same
time by pressing and holding down the Up Arrow Key.
• Pressing the Up Arrow Key will scroll through mbar, kPa and inH2O
• Pressing and holding down the Up Arrow Key will activate and deactivate
the pump
• Pressing the Down Arrow Key will Zero the Pressure reading
• Pressing the Scroll/Enter Key will toggle the ch2 temperature reading ON
and OFF
The 712 incorporates a differential manometer. Pressure applied to the (-)
port is subtracted from the pressure applied to the (+) port. Examples of
pressures being measured:
(+) port = 10”H2O, (-) port = Not Connected, Displayed reading =10”H2O
(+) port = 10”H2O, (-) port = 5”H2O, Displayed reading = 5”H2O
The pressure function
allows you to perform draft
and pressure tests.
Function Display 2 (Pressure)
Pressure Reading
T2 Temperature
22
