Series 23 Ed / 25 Ed, 33 X Ed / 35 X Ed0 pages

Pressure Transmitter with Pressure Proof Housing
Series 23 Ed / 25 Ed
Series 33 X Ed / 35 X Ed
for hazardous applications
These piezoresistive pressure transmitters with pressure proof housing are approved for use in
explosion risk areas of group II. They provide stable and accurate measurements of absolute and
gauge pressures of liquid and gaseous media in the pressure range between 0,1 and 300 bar.
Flexibility
The modular structure of this product range allows highly flexible applications and solutions that
are tailored to users‘ requirements. Numerous versions are available, for example with different
pressure connections, materials and filling oils, or versions for use with oxygen and with special
performance characteristics. In addition to the classical analog output signal (Series 23 Ed and
25 Ed), a digital solution based on the successful high-precision Series 30 X transmitters is also
available (33 X Ed and 35 X Ed).
Analog transmitters, Series 23 Ed and 25 Ed
This series is based on the stable piezoresistive transducer with analog electronics. The zero
point and sensitivity, and the temperature coefficients for the zero point and sensitivity, are
compensated by resistors and/or potentiometers.
Series 23 Ed
Series 33 X Ed
Digital transmitters Series 33 X Ed and 35 X Ed
This series features microcontroller-based electronic evaluation to ensure maximum accuracy.
Each transmitter is gauged across the entire pressure and temperature range. This provides the
basis for calculating a mathematical model that corrects all reproducible errors. The pressure
value can be read via the interface and at the same time it is also available in analog form as a
4…20 mA or 0…10 V version.
Interface: RS485 half-duplex for 9600 and 115’200 baud for line lengths up to 1400 m and a maxi­
mum of 128 bus subscribers. Protocol: KELLER Bus and MODBUS RTU. The devices can be
configured (scale analog output, switch units, change filter settings, zeroing, etc.) and measured
values can be recorded with the CCS30 or PROG30 software, available free of charge.
Ex-Classification
II 2 G
Ex db IIC T6 to T4
LCIE 03 ATEX 6082 Xtt
0081
Series 25 Ed
Series 35 X Ed
T4 for Ta ≤100 °C, T5 for Ta ≤95 °C, T6 for Ta ≤80 °C
Series 23 Ed / Serie 33 X Ed
Series 25 Ed / Series 35 X Ed
1/4" - 14 NPT
2
12
Pressure connection:
illustrations of examples
10
87/97
2
G 1/2"
Viton®VitonDichtung
Seal
18
11
HEX 27
SW 27
HEX 27
SW 27
ø 25
71
ø 25
Subject to alterations
KELLER AG für Druckmesstechnikt
KELLER Ges. für Druckmesstechnik mbHt
Companies approved to ISO 9001
05/2011
St. Gallerstrasse 119t
Schwarzwaldstrasse 17t
CH-8404 Winterthurt
D-79798 Jestettent
Tel. +41 (0)52 - 235 25 25t
Tel. +49 (0)7745 - 9214 - 0t
Fax +41 (0)52 - 235 25 00
Fax +49 (0)7745 - 9214 - 60
www.keller-druck.com