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MENU DESCRIPTIONS
RON Relay on set point
Sets the CO2 concentration which the optional relay
is energized.
ROF
Relay off set point
Sets the CO2 concentration which the optional
relay is de-energized. Setting value lower than
RON provides direct action for detecting high
concentrations of CO2. Setting value higher than
RON provides indirect action for detecting low
concentrations of CO2. Up button and Down button
on the LCD display will be lit to indicate when the
relay is energized.
Low limit:
0 PPM
Factory setting:
950 PPM
High limit:
2000/5000 PPM
(depending on model)
DSP
Display configuration
Determines the LCD display configuration during
normal operation. The LCD display can indicate
the CO2 concentration, temperature and CO2
concentration.
CT CO2 concentration and temperature
C
CO2 concentration only
T
Temperature only
UNI
Units selection
Temperature and barometric pressure
measurements can be displayed in US engineering
units or SI engineering units. The factory default is
to display US engineering units.
US units °F for temperature and in Hg for
barometric pressure
SI units °C for temperature and hPa for barometric
pressure
COL
CO2 low output range
Sets the CO2 concentration for the lowest output
(4 mA or O VDC).
Low limit: 0 PPM
Factory setting: 0 PPM
High limit: 2000/5000 PPM (depending on model)
COH CO2 high output range
Sets the CO2 concentration for the highest output
(20 mA, 5 VDC or 1O VDC). When COH is set above
COL, the transmitter is direct acting and the output
will increase with an increase in CO2 level. When
COH is below COL, the transmitter is reverse acting
and the output will increase with a decrease in CO2
level.
Low limit: 0 PPM
Factory setting: 2000/5000 PPM (depending on
model)
High limit: 2000/5000 PPM (depending on model)
Manual 7960-902
Page
4 of 6
AAC
Average Atmospheric Carbon Dioxide value
Sets the value at which the sensors automatic
background calibration will reference. Factory
setting derived from research from the National
Oceanic and Atmospheric Administration (NOAA).
Low limit: 200 PPM
Factory setting: Current NOAA value
High limit: 9999 PPM
TOL
Temperature low output range (Series CDT with
active temperature only)
Sets the temperature for the lowest output (4 mA or
O VDC).
Low limit: 32.0°F/0.0°C
Factory setting: 32.0°F/0.0°C
High limit: 122.0°F/150.0°C
TOH
Temperature high output range (Series CDT with
active temperature only)
Sets the temperature for the highest output (20
mA, 5 VDC or 10 VDC). When TOH is set above
TOL, the transmitter is direct acting and the output
will increase with an increase in temperature. When
TOH is below TOL, the transmitter is reverse acting
and the output will increase with a decrease in
temperature.
Low limit: 32.0°F/0.0°C
Factory setting: 122.0°F/150.0°C
High limit: 122.0°F/150.0°C
BAR
Barometric pressure
Sets the typical barometric pressure for the
location where the transmitter is mounted. The
factory setting is for standard pressure at sea
level. Adjusting the barometric pressure gives a
more accurate measurement, especially at higher
elevations. Refer to the elevation charts in Table 1
for typical barometric pressures at a given elevation.
Low limit: 20.0 in Hg/677 hPa
Factory setting: 29.9 in Hg/1013 hPa
High limit: 32.0 in Hg/1084 hPa
CAL
Calibration
Calibrates the carbon dioxide sensor to a known gas
value. Read CALIBRATING SENSOR below before
using this feature. Hold Enter button for 5 seconds.
RST
Reset to Factory Defaults
Resets all menu settings lo their default value, and
clears zero and span.
YES: Press and hold -- button for several seconds to
reset settings
NO: Press -- button to exit this menu item without
resetting
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