Controller Sensors 880 User Manual

MODEL 880

CAUTION:

+ •

- •

• + Power Supply

• - Power Supply

• - Ctrl Negative

• Ctrl Ground

CONTROLLER

4 to 20 mA Output

ELECTRICAL CONNECTIONS

CONVERTING 4-20MA TO 1-5 VDC

TRANSDUCER
INSTALLATION

The Model 880 Pressure Transducer is a 2-wire,
4-20mA, compact instrument for measuring
and controlling the many different media that
are compatible with our sensing element.
Positive, negative, and differential pressures can
be measured in ranges from 0-1” WC to 0-15
PSI with a 4-20mA output. Split ranges are also
available.

INSTALLATION

1. Location- The model 880 pressure

transducer should be placed in as clean, dry and
vibration free a location as possible.

2. Pressure Connections- The 880 pressure

transducer uses 2 barbed fittings for use with
1/8” ID vinyl or rubber tubing. Attach tubing
from positive pressure or higher pressure
source to port marked High (P1) and lower or
negative pressure to opposite port (P2).
Arrange tubing to minimize stress on
connections. If possible, mount with ports
facing down to aid in moisture drainage.

Note: When removing tubing care should be
used to avoid breaking the ports. In some cases
the tubing should be cut off, rather than pulled
off, especially if stiff tubing is being used.

3. Mounting- Attach the Model 880

Transducer to the mounting surface using 2
fasteners inserted through the two mounting
holes located on either the side mounting
flanges, or the holes at the top of the case. Do

not over-tighten.

All electrical connections to the 880 series
transducer are made to the pluggable screw
terminal block. The block is coded as follows.

1)”+” = Supply Positive,

2) “-“ = Supply (or Controller) Negative.

An external power supply (Vs) delivering 14

- 36 VDC with a minimum of 30mA output
is required to drive the unit. The load must
meet the following requirements:

Minimum Loop Resistance (RLmin):
If Vs<30Vdc, RLmin= 0 ohms
If Vs>30Vdc, RLmin=(Vs-30) x 40 ohms
Maximum Loop Resistance (RLmax):
RLmax=(Vs-14) x 50 ohms
(Example: If Vs=24Vdc, RLmax=500 ohms)

Alternatively, if RL is known:
Vs,min = RL/(50) + 14Vdc
Vs,max = RL/(40) + 30Vdc

Do not exceed specified

supply voltage.

TYPICAL 2 WIRE CONNECTION

880 Series Pressure transducers with a 4-20mA
current output can be easily adapted to
controllers requiring 1-5 VDC input. Insert a
250 ohm resistor between the “+” and “-”
controller input terminals. This will safely
convert the 4-20mA signal to 1-5VDC.

OFFSET

The offset of the 880 series transducer is
factory set. If it should need adjustment upon
arrival, the offset pot is located next to the ports
on the end of the unit. With the transducer
installed and no pressure applied place a meter
in series with the negative “-“ and the ground.
Turn offset adjusting pot to desired reading.

CUSTOMER SERVICE

If any problems are encountered during
installation please call the number below for
assistance.

Call 1-800-735-8998

7638 Washington Ave S

Eden Prairie, MN 55344

+1.800.735.8998 • +1.952.942.8743

FAX [phone]

www.controllersensors.com

IN-880 Rev A