4220 Flow Meter
Section 5 Options and Accessories
5-6
5.3.2 Internal Multiple
Analog Output Board
For those needing more than one analog output, Teledyne Isco
offers the Multiple Analog Output Board, which is installed
inside the flow meter. This board provides from one to three iso-
lated 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
• Use a larger battery: either a commercial
deep-cycle/marine type, or an Isco 35 Ampere-hour
lead-acid battery.
• Order only one analog output.
• Flow meter program choices also affect power
consumption. Use “minimum” settings, if possible. (See
Section 1, Table 1-5 and Section 5.)
The outputs from the analog output board are electrically iso-
lated from the flow meter and from each other by internal
DC-DC converters. The board uses the opening for the modem
connector for its outputs. Normally, a flow meter will not need
both the analog and modem boards. If your installation does,
however, you should contact the factory.
The analog board terminates in a 6-pin male M/S connector on
the flow meter case. Flow meters built with the analog board
option are also supplied with an output cable. This cable con-
nects to the wiring that runs to the equipment controlled by the
4-20 mA current loop and to the 6-pin M/S connector on the flow
meter. The cable has a 6-pin female M/S connector and is pro-
vided with stripped pigtail ends for convenient wiring.
Adjustments / Calibration Factory-calibrated; when used within
range, no adjustment needed,
Maximum Distance 1,500 ft. (457.3 m) using 18 AWG wire.
Table 5-1 4-20 mA Output Interface Specifications