Series 36 X W0 pages

Highly Precise Level Pressure Transmitters
digitally compensated

Series 36 X W

/ rangeable / digital and analog output

These pressure transmitters are designed for level measurements where the highest accuracy
is required.
Digital Output of Transmitter
This Series is based on the stable, piezoresisitive transducer and a micro-processor electronics
with integrated 16 bit A/D converter. Temperature dependencies and non-linearities of the
sensor are mathematically compensated. With the READ30 software and the KELLER cable
K-107, the calculated pressure can be displayed on a Palmtop, Laptop or PC. The READ30
software also allows the recording of pressure signals and the graphic display on the PC. Up
to 128 transmitters can be hooked together to a Bus-system.
Transmitter with Analog Output
The micro-processor integrates a D/A converter of 16 bit for analog signal outputs of 4…20 mA
or 0…10 V. The output rate is 100 Hz (adjustable). The digital output is available on all
transmitters with analog output.
Programming
With the KELLER software READ30 and PROG30, a RS485 converter (i.e. K-102, K-104 or
K-107 from KELLER) and a PC (Laptop), the pressure can be displayed, the units changed, a new
gain or zero set. The analog output can be set to any range within the compensated range.
The level transmitters are available in two different versions:
• PAA-36 X Wt

Absolute Pressure, Zero at Vacuum

This probe is applied when the atmospheric pressure is measured by a separate barometer
and when the water level is calculated as the difference between the absolute value and the
ambient pressure.
• PR-36 X Wt

Relative Pressure, Zero at ambient Pressure

This probe is fitted with durable cable with an integral vent tube to the atmosphere.
These level transmitters can be subject to internal condensation caused by installations in
cold water on warm, humid days. If the reference tube is not terminated in a warm, dry
enclosure, KELLER recommends the use of a purpose built cartridge filled with a silica gel
which is fitted at the end of the reference tube.

Electrical Connections
Output

Black

GND

White

3-wire

OUT

Red

+Vcc

Black

Program-

RS485A

Blue

ming

ø 22

White

+Vcc

0…10 V

Mark of diaphragm
position

Wire Color

OUT/GND

2-wire

≈121 mm

Function

4…20 mA

≈ 146 mm

RS485B

Yellow

Subject to alterations

03/08

KELLER AG für Druckmesstechnikt

St. Gallerstrasse 119t

CH-8404 Winterthurt

Tel. +41 (0)52 - 235 25 25t

Fax +41 (0)52 - 235 25 00

KELLER Ges. für Druckmesstechnik mbHt

Schwarzwaldstrasse 17t

D-79798 Jestettent

Tel. +49 (0)7745 - 9214 - 0t

Fax +49 (0)7745 - 9214 - 60

Companies approved to ISO 9001:2000

www.keller-druck.com