Dynasonics MFX Series Insertion MagProbe Flow Meter - Manual (Page 42)

Rev. 01/11
-3.8- MFX
ISO-MOD 4-20mA
FL 4MA
FL 20MA
CAL 4MA
CAL 20MA
4-20 TST
Configured via jumper selections into either a passive or active
transmission mode (see Section 2 for details), the 4-20 mA Output
Module interfaces with virtually all recording and logging systems by
transmitting an analog current signal that is proportional to system
flow rate. Independent 4 mA and 20 mA span settings are
established in software using the Flow Measuring Range entries.
These entries can be set anywhere in the –30 to +30 FPS (-9 to +9
MPS) measuring range of the instrument. Output resolution of the
module is 12-bits (4096 discrete points) and the module can drive
up to 800 Ohms of load with its internal 24V isolated power source.
The FL 4MA and FL 20MA entries are used to set the span of the 4
-20 mA analog output. These entries are volumetric rate units that
are equal to the volumetric units configured as Engineering Rate
Units and Engineering Units Time Interval entered on page 3.10.
These entries may be entered anywhere in the flow measurement
range of the instrument [velocity range of –30 to +30 FPS (-9 to +9
MPS)].
For example, to span the 4-20mA output from –100 GPM to +100
GPM, with 12mA being 0 GPM, set the FL 4MA and FL 20MA
inputs as follows:
FL 4MA = -100.0
FL 20MA = 100.0
PART 3 - KEYPAD CONFIGURATION
4-20mA Span
4-20mA
NOTE: The Minimum Rate may be set anywhere in the flow
measurement range of –30 to +30 FPS (-9 to +9 MPS). For
example: if bi-directional flow needs to be logged, set the MIN
RATE at a negative value.
2. OUTPUT #1 MENU