BRONKHORST®
Page 32
EL-FLOW
Base
Series Mass Flow Controllers
9.17.061
Customer model
Type
Access
Range
FlowDDE
FlowBus
ModBus PDU
Unsigned char[16]
RW
-
93
113/4
0xF120..0xF127/61729..61736
Digital instrument manufacturing configuration information string.
This string can be used by Bronkhorst® to add extra information to the model number information.
4.1.3 Fluid Information
Next parameters give information about the fluid range of the instrument.
Fluid name
Type
Access
Range
FlowDDE
FlowBus
ModBus PDU
Unsigned char[10]
RW
-
25
1/17
0x8188..0x818C/33161..33165
Fluid name consists of the name of the fluid. Up to 10 characters are available for storage of this name.
Fluid unit
Type
Access
Range
FlowDDE
FlowBus
ModBus PDU
Unsigned char[7]
R
-
129
1/31
0x81F8..0x81FB/33273..33276
The Fluid unit can be read by parameter ‘capacity unit’. This parameter contains the unit in maximal 7
characters.
Capacity 100%
Type
Access
Range
FlowDDE
FlowBus
ModBus PDU
Float
R
±1E-10… ±1E+10
21
1/13
0x8168..0x8169/33129..33130
Capacity is the maximum value (span) at 100% for direct reading in sensor base units.
Capacity 0%
Type
Access
Range
FlowDDE
FlowBus
ModBus PDU
Float
R
±1E-10… ±1E+10
183
33/22
0xA1B0..0xA1B1/41393..41394
This is the capacity zero point (offset) for direct reading in sensor base units.
4.1.4 Auto Zeroing
To start the auto zero-procedure two parameters should be written:
Control Mode
Type
Access
Range
FlowDDE
FlowBus ModBus
Unsigned int
RW
0…18
12
1/4
0x0024/37
Check chapter 3.9.2, “Basic Parameters”, for available control modes.
Calibration Mode
Type
Access
Range
FlowDDE
FlowBus ModBus
Unsigned int
RW
9
58
115/1
0x0E61/3682
Value Mode
Instrument action
0
IDLE
Idle
9
AUTO_ZERO
Auto-zeroing
255
ERROR
Idle
Procedure:
Step 1: Set Control Mode to CALIBRATION_MODE (9)
Step 2: Set Calibration Mode to AUTO_ZERO(9)
Step 3: Check Calibration Mode,
IDLE
Auto-zeroing succeeded
AUTO_ZERO Auto-zeroing active
ERROR
Auto-zeroing failed
