4210 Flow Meter
Section 4 Optional Equipment
4-6
4.5 The Internal Analog
Output Board
For those needing more than one analog output, Isco offers the
Multiple Analog Output Board, which is installed inside the
flow meter. This board provides from one to three isolated analog
outputs. You can order the board with three, two, or one circuit
installed. You must specify this when the flow meter is ordered.
The board is compatible with the existing external 4-20 mA
output box (60-1784-039). A flow meter can use either the
internal board, the external box, or both, for a maximum number
of four analog outputs.
Note
If your flow meter has both the multiple analog output board
and the external analog converter, the internal ports will be
designated Analog Outputs 1, 2, and 3 (depending on how
many are present). The external converter will be designated
either “External” or “Analog Output 0.”
The Multiple Analog Output Board consumes a minimum of 16
mA per output; consequently, the flow meter should be
AC-powered. If you must use battery power, you should consider
the following to extend battery life:
• Use a Solar Panel Battery Charger
Table 4-1 External 4-20 mA Specifications
Power 120 VAC
1
/8 Amp.
Output Connector 3-pin male plug
Pin A: + current out
Pin B: – current out
Pin C: not used
Output Accuracy
At 72
o
F (22
o
C)
Full Oper. Range
±0.25% of full-scale
±0.5% of full scale
Operating Range 0° to 140°F (–18° to 60°C)
Resolution 0.1% of full-scale
Input Connector 6-pin male M/S
Pin B: – pulse input
Pin F: + pulse input
Pins A, C, D, E: NC
Isolation Output current optically isolated from flow
meter.
Fusing
1
/4 Amp. internal on AC line.
Adjustments/Calibration Factory-calibrated; when used within
range, no adjustment needed,
Maximum Distance 1,500 ft. (457.3 m) using 18 AWG wire.
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