Meriam M1 – Series Digital Manometer - Manual (Page 5)

M1 Series - DM Instruction Manual 9R000034-IR
E.O. 6409 JAN 2008
www.meriam.com
Page 5 of 17
1. Zeroing the M1
To Zero the M1, first turn off pressure sources and vent pressure
ports to atmosphere. Then simultaneously press and hold the F
and U keys until “F.CAL” is displayed. The display will read “----
” during the zeroing process. The process is complete when the
display changes from “----” to a “zero” reading.
Note: The M1 can only be zeroed if the measured zero is within
±2.5% (of FS) of the factory calibrated zero limit. Further
details are provided under Field Recalibration.
2. Functional Modes
The Digital Manometer supports NORMAL and TEMP modes.
The NORMAL mode of operation has an additional sub-mode
referred to as “REC” or record mode, which is described later.
For Pressure measurements:
The red backlight will illuminate when the M1 is measuring
pressure values outside its calibrated range. When the red backlight
is on, the accuracy of these measurements is uncharacterized.
Beyond 110% of the calibrated range, “----” will be displayed. The
red backlight will be illuminated in both cases.
The minimum and maximum pressure the M1 has measured is
permanently recorded for factory warranty issues.
For Temperature measurements:
• Selecting the TEMP mode (the °F or °C icon) will display the
internal ambient temperature of the M1.
o
the UNIT key will toggle between °F and °C
The minimum and maximum temperature the M1 has
measured is permanently recorded for factory warranty issues.