POWER ON
After the pressure connections are secure, apply
power to the power connector on the rear of the
instrument. Turn the power switch to ON. The
instrument will go through a brief initialization
process and system check. The display will light up
a portion of the leading character on the top line to
indicate it has started. After about 60 seconds the
screen will change to display the instrument name,
the software version number, the chassis serial
number, and the fact that it is initializing. In the
following examples n represents a number from 0
to 9.
MENSOR PCS-400 Vn.nn SN nnnnnn
INITIALIZATION....
The second line is quickly replaced by MAX RANGE
nnn.nnn PSI A (or PSI G) to indicate the full scale
(FS) range of the primary transducer.
At the end of the initialization process the screen
will default to the STANDBY mode, indicating that
the PCS 400 is ready to use. A warm-up period of at
least 45 minutes is advised for greatest accuracy.
STANDBY MODE:
MEASURED: nn.nnn PSI A
SYSTEM CHECKOUT
With the system properly plumbed and powered
on, and the supply pressure at the correct value,
press [2nd] [CE] to enable the VENT mode, and
observe the displayed pressure. This will be close
to zero on a gauge instrument, or barometric pres-
sure on an absolute unit. To begin the checkout
enter the following keystrokes on the keypad:
Control Pressure Check
[2nd] [9] to enter CONTROL mode which places a
question mark prompt (?) on the display. Next,
enter a number value..
[n...n] where n is a number. Enter a value approxi-
mately fifty percent of the FS range of the
primary transducer, and then..
[=] The regulator will begin to slew to the com-
manded value. The changing pressure will
be displayed with a [U] to indicate that the
pressure has not stabilized. When the pres-
sure settles at the command point the [U]
will be replaced by [S] to indicate the pres-
sure is stable. If no problems are observed,
press..
[n...n] Enter a number value equal to the FS range
of the unit, then..
[=] Wait for the pressure stable indicator [S],
then proceed to the leak check.
System Leak Check
With the system holding the FS pressure in CON-
TROL mode, perform a system leak test to check
the pressure integrity of the total system. This test
should be at the highest pressure at which the
system is expected to function. Leak test results are
most accurate if the system is stabilized at the test
pressure prior to starting the test. Perform the
system leak test by entering the following key-
strokes:
[2nd] [2] to access the TEST mode, then press..
[+] several times to reach the SYSTEM
LEAK TEST. Press..
[=] to confirm that this is the desired func-
tion, and then enter the FS value..
[n...n] for the pressure to be tested. Enter..
[=] two times and the leak test will begin
with a blinking question mark (?).
When the system stabilizes at the test pressure the
display will replace the ? with a value near zero to
indicate the pressure change. The display will con-
tinue to update the total pressure change for a
period of time and finally default to the STANDBY
mode. Small pressure changes observed during the
test are normal, and frequently cycle around a
value. A large change in the pressure that continues
in a negative direction is indicative of a leak some-
where in the system.
CAUTION: VACUUM PUMP USE.
Do not connect a vacuum pump to the
reference port of gauge pressure units
of 5 psig or less. Gauge pressure sensors
in these low ranges can be destroyed by
subjecting them to negative pressure.
Optional dual differential relief valves
are available to prevent such damage.
INSTALLATION PCS 400
2-2 www.mensor.com
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