Felix Storch F-901B, Справочное руководство

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F-901B Reference Manual
Page 10 of 15
Note:
•
Values written to the above holding registers remain after Power-off/Reset
•
To perform a span calibration for CO2 , C2H4 or O2 sensor:
o
Apply C alibration gas at device inlet
o
Wait until reading stabilized
o
Read sensor’s current measurement on Input Registers and sensor’s SPAN value on Holding Registers
o
Calculate Span value using the provided formula and round this value to the nearest integer
o
Write new span value back to the sensor’s SPA N register
•
To perform a zero calibration for C2H4 or O2 sensor (see also zero calibration with coils setting bellow):
o
Put device in Continuous measurement mode (write 0 to TRIGGER_INTERVAL register)
o
Apply Zero gas at device inlet
o
Wait until reading stabilized (C2H4 >= 7 minutes, O2 >= 2 minutes)
o
Read sensor RAW value on Input Registers
o
Write this value to the according C2H4/O2 ZERO register
o
Put device back in Trigger measurement mode (write 300 to TRIGGER_INTERVAL register)
Coils
Mode: Read/Write, size: 1 bit
Name Address Default Description
ZERO_C2H4 4 False Request to zero C2H4 sensor
ZERO_O2 5 False Request to zero O2
ZERO_CO2 6 False Request to zero CO2 sensor
ZERO_CONF 7 False Confirmation of zero action
FLOW_MODE 8 True Set the air flow configuration.
True: flow in sampling mode
False: flow in cleaning mode
RESET 9 False True: (software) reset
False: no action
IMPORTANT : backup calibration parameters before performing a zero calibration. A zero calibration will overwrite
the factory zero calibration parameter in Holding register.
Note:
•
To perform a zero calibration using coils for CO2 , C2H4 or O2 sensor
o
Put device in Continuous measurement mode (write 0 to TRIGGER_INTERVAL register)
o
Apply Zero gas at device inlet
o
Wait until reading stabilized (C2H4 >= 7 minutes, CO2/O2 >= 2 minutes)
o
Set ZERO_[ SENSOR ] coil (ZERO_C2H4/ZERO_O2/ZERO_CO2) to request zero action
o
Set ZERO_CONF coil to confirm. After confirmation, the device will perform zero action with the
current gas and automatically reset the ZERO_[
SENSOR ] and ZERO_CONF coil. New zero values will
also be updated on Holding Registers
o
Put device back in Trigger measurement mode (write 300 to TRIGGER_INTERVAL register)