Setting Parameters
Configure the Gas Detector • 17
Gas Groups / Specific Gas
Selection
Selects either gas group number
for broadband operation or
specific gas name for
gas-specific mode.
Broadband: Select from 4
groups of gases:
1. R134a, R404a, R407a,
R407c, R407f, R427a, R507,
R514A, HFO1233ZD
2. R448a, R449a, R422a,
R422d HFO1234YF, and
HFO1234Ze, R513a, R452a,
R452B
3. R22 (by itself)
4. R32 (by itself).
Specific Gas: The actual
refrigerant name is shown.
Select the appropriate
refrigerant.
NOTE
: Gas-specific detectors
are factory calibrated to a single
refrigerant using specialized
manufacturing equipment. If
another refrigerant is selected
which differs from the factory
calibrated setting, the built in
calibration no longer applies.
Further improvement in
detector accuracy may be
gained by applying calibration
gas containing the newly
selected refrigerant and
adjusting the gas detector
reading to match (see Parameter
P.-17
).
Buzzer Mute Time
Sets a time (0-59 minutes)
during which the active buzzer
remains muted:
• after the “I” button is pressed,
or
• after Modbus register 4000 is
set to 0.
Baud Rate
Sets the baud rate for Modbus
(RS-485) communications.
00 9,600 baud (default).
Parameter
Description
Table 5-2
- Parameter Numbers, Names, and
Descriptions
Stop Bits
Sets the number of stop bits
required to match the
controlling communications
equipment (for example,
building management system,
etc.).
01 1 stop bit (default)
02 2 stop bits
Parity
Sets Modbus parity option.
00 None (default)
01 Odd parity
02 Even parity
Analog Output Scaling
Allows the user to select the
full-scale PPM value that
represents maximum analog
output (for example, 20 mA) for
scaling the analog output.
Adjustment range is from 100
PPM to 3500 PPM.
Default = 3500 PPM
. (The
setting cannot be adjusted
above 3500.)
Use the UP and DOWN buttons
to set the desired full scale
value. All outputs will be scaled
to the indicated full scale value.
NOTE:
Alarm values are not
scaled, but are absolute values.
Setting a smaller full scale does
not correspondingly scale the
alarm setting.
NOTE:
When the PPM level is
greater than the programmed
analog output Full Scale PPM
(
P.-16
), the analog output will
go to a 10% over range state
(indicating that the
concentration is too high for the
analog output to achieve). For
example, for a 1-5V setting the
analog output would go to 5.5V,
for 4-20 mA it would go to
22 mA and so on.
Parameter
Description
Table 5-2
- Parameter Numbers, Names, and
Descriptions
