C-Link Protocol Commands
Calibration
Thermo Fisher Scientific
Model 42
i
Trace Level Instruction Manual
B-27
set high nox coef
value
set low no coef
value
set low no2 coef
value
set low nox coef
value
These commands set the NO, NO
2
, and NO
x
coefficients to user-defined
values to
value
, where
value
is a floating-point representation of the
coefficient. The example below sets the NO coefficient to 1.005.
Send:
set no coef 1.005
Receive:
set no coef 1.005 ok
no gas
no2 gas
nox gas
high no gas
high no2 gas
high nox gas
low no gas
low no2 gas
low nox gas
These commands report NO, NO
2
, and NO
x
span gas concentrations used
to auto-calibrate low NO, NO
2
, and NO
x
coefficients. The high and low
commands are only available in dual and auto range mode. If the mode is
incorrect, the instrument responds with “can’t, wrong settings”. The
example below reports that the NO low span gas concentration is 240.0
ppb.
Send:
low no gas
Receive:
low no gas 2400E-1 ppb
set no gas
value
set no2 gas
value
set nox gas
value
set high no gas
value
set high no2 gas
value
set high nox gas
value
set low no gas
value
set low no2 gas
value
set low nox coef
value
These commands set the NO, NO
2
, and NO
x
span gas concentrations used
by the auto-calibration routine to
value
, where
value
is a floating-point
representation of the gas concentration in current selected units. The gas
units are the same as those chosen by the user. The example below sets the
NO span gas concentration to 123.4 ppb.
Send:
set no gas 123.4
Receive:
set no gas 123.4 ok
