Contrec 214D, Руководство пользователя, Страница: 20 / 42

Valve Control and DC Power
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5. VALVE CONTROL AND
DC POWER
The Model 214Di will operate from an external power source between 9-
28VDC and draws no more than 4mA. This enables the instrument to be
powered from AC mains adaptors and eliminate the need to run mains
voltage in the field.
As the instrument has an internal battery backup it will power the instrument if
DC power is interrupted, but these batteries are not capable of powering the
solenoids or sensors if they require external power (see section 6 for further
description of operation with battery backup.)
Solid state relay outputs provide control to solenoids or relays and can sink
up to 200mA. The outputs are internally protected against voltage spikes
caused by relays and coils. Connections for a dual stage applications is given
on the following page.
For single stage applications, only Output 1 is required.
Specification for Outputs
Maximum Current (sink): 200mA.
Maximum Voltage: 30VDC.
Saturation Voltage: 0.8VDC max across the outputs in the "on"
state.