4-60
1010GCNFM-3C
Section 4
Note that the flowmeter recognizes the first analog input variable that is assigned to any given param-
eter and ignores any subsequent input with the same assignment. For example, if Iin1 and Iin2 are both
assigned to represent pressure (PSIA), the flowmeter will only use the pressure input from Iin1.
Setting up the Analog Current Input
The first step is to enable the DC current input port.
From Analog Input setup:
1. Press the <Right Arrow> once to access the desired input port [Iin1 to Iin4] option list.
2. Move the cursor to down to the desired port and then press <Right Arrow> twice. Scroll <Down
Arrow> to select the desired input parameter then press <ENT>. (Select from a list of PSIA, BARA,
Deg F, Deg C, AUX or Off.) The cursor moves to [4 mA].
3. Press the <Right Arrow> to enable numeric entry.
4. Type the numeric value corresponding to a 4 mA input signal.
5. Press <ENT> to store the data. This moves the cursor to [20 mA].
6. Press the <Right Arrow> to enable numeric entry.
7. Type the numeric value corresponding to a 20 mA input signal.
8. Press <ENT> to store the data.
I/O Data Control Analog Inp Setup Iin1 Input Off
Aux*
PSIA
BARA
Deg F
Deg C
4 mA numeric entry
20 mA numeric entry
Iin2/Iin3/Iin4* See Iin1 option list
Ú
Ö
Ö
Ú
Ú
Ú
Ö
Ú
Note: Aux input is used only as a convenient feed through to the Datalogger.
4.10.3 ANALOG INPUT SETUP
The Analog Input Setup function assigns an active analog input to a measurement channel/path. The
meter provides four DC current input ports for single channel or Dual Path units. The DC current input
ranges from a zero level of 4 mA to a full scale of 20 mA. The [Analog Input Setup] menu cell allows you
to enable this port and then span it to any desired scaling.
For example, when using the analog input for pressure the numeric variables might be spanned as
follows: 4mA=14.7 PSIA and 20mA=1014.7 PSIA.
The various flowmeter models allow you to associate the analog input to active system variables such as
pressure and temperature (see table below).
(Keep in mind that the flow computer expects “absolute” pressure. If the external device reports
“gauge pressure” then be careful to span the pressure input so that 4mA represents 1 ATM (14.7
PSIA or 1.014 BARA) and not 0.0.
NOTE: Refer to the appropriate Installation Drawing for the locations of these inputs and the
wiring procedure.
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