DriSteem Vapor-logic3 Instrukcje Operacyjne Pobierz pdf (Strona 21)

12 mA - 4

.16

Wiring of sensing devices.

Installation

Wiring on-off humidistats

DRI-STEEM provides three types of on-off controls:

wall-mounted humidistat, duct-mounted humidistat,

or pneumatic/electric relay. The wiring diagram

(found on the inside of the humidifier control

cabinet) will show proper wiring for these controls.

Wiring modulating humidistats

The signal from a humidistat directly controls the

amount of output from the humidifier. The standard

modulating humidistat controllers DRI-STEEM

provides are either duct or wall-mounted.

The humidistats are powered by a 21 VDC supply

provided by the VAPOR-LOGIC

control board. A

variable control signal is returned to provide the

modulating function on the humidifier.

For a pneumatic modulating signal, DRI-STEEM

may provide a transducer, which accepts a 3-20 psi

pneumatic input range.

Wiring modulating humidity

or temperature transmitters

Transmitters provide an analog signal proportional to

the process variable being measured. All transmitters

provided by DRI-STEEM are two-wire devices. (See

your wiring diagram for proper connections.) The

humidity transmitters have a range of 0-100% RH

with an output of 4-20 mA. The temperature

transmitter has a range of -20° to 160°F

(-29° to 71°C) with a 4-20 mA output.

Calculation of transmitter % RH

% RH =

Example: = 50%

(milliamp reading minus 4)

.16

Installation:

Wiring of sensing devices

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 74 75

Brak uwag

DriSteem Vapor-logic3 Instrukcje Operacyjne Strona 21