PressureMAT User Guide
Revision 8
Page 15/48
Navigation Between Pressure Sensor Input Channels
At the HOME screen, the UP/DOWN arrows are used to change the selected pressure input
channel.
Zero Calibration for Pressure Sensors
1. Select the desired input channel using the UP/DOWN buttons
2. With a pressure sensor connected to the system and EXPOSED ONLY TO
ATMOSPHERIC PRESSURE, press the Tare Button (LEFT ARROW button) on the
keypad
3. The display should read 0.0 psi / 0.00 bar
4. If 0.0 psi / 0.00 bar is not displayed, press the ZERO/TARE button on the keypad again
Note: a minus sign may appear on the display when it reads 0.0 psi / 0.00 bar; this is
normal as the pressure measured by the system may be a value such as -0.001 but
displayed as -0.0 psi / -0.00 bar.
Alarm Function
If any channel has an alarm set, the alarm function includes:
a. The display screen will blink “ALARM>” on the channel with the alarm
b. An audible tone for 30 seconds during the present alarm (it is reset for a new alarm
condition)
c. If present, a dry contact relay associated with that channel will switch (i.e., if wired as
normally CLOSED, it will OPEN; if wired as normally OPEN, it will CLOSE)
When an alarm condition goes away, all indicators automatically go back to normal (unless the
optional alarm latching function is turned on). If a sensor is inadvertently not connected or
becomes accidentally disconnected during a process the pressure reading will drift and
eventually go to a value greater than 75psi/5.17 bar and an alarm condition will occur if the
high alarm set-point is surpassed or in psi when the value goes above the hard-coded limit of
75. The time until the high alarm occurs may vary and this feature should not be used to
control a process due to the time variance. Associated relays will switch and the analog output
will send greater than 20mA.
Program Menu
To access the program menu for a pressure sensor, press the PROG key on the keypad with the
desired input channel selected. The program menu is mainly used for setting of the high and
low alarm set points and alarm detect delay. After pressing the PROG key, the following
screen appears with X indicating selected channel:
Output Viewing
Input Programming
Output Programming
Note: the PMAT-S menu selections are truncated due to space limitations on certain screens
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