Keller 25 HT Specifications

KELLER AG für Druckmesstechnik St. Gallerstrasse 119 CH-8404 Winterthur Tel. 052 - 235 25 25 Fax 052 - 235 25 00
KELLER

Gesellschaft für Druckmesstechnik mbH Schwarzwaldstrasse 17 D-79798 Jestetten Tel. 07745 - 9214 - 0 Fax 07745 - 9214 - 50

Companies approved to ISO 9001 / EN 29001

3/98

www.keller-druck.com

Subject to alterations

TRANSMITTERS FOR BIO-REACTORS

ABSOLUTE- AND GAUGE PRESSURE

SERIES 25 HT

This piezoresistive pressure transmitter fits 19 mm (3/4”) manifold pressure ports for appli­cations in bio-reactors or autoclaves. The transmitter is compensated up to 150 °C and may
be operated continuously or sterilised at this level, including the special circuit electronics.

The transmitter circuit is based on the “PROGRES” programmable KELLER amplifier. In the
25HT-PRO version, the programming leads are taken to the 7-pin connector, thus allowing to
reprogram the transmitter at any time, altering the zero and the range by a factor of 5, using
the hand held PP-96 Progres Programmer. The cable outlet version does not provide these
control lines and cannot be reprogrammed.

The transmitters are normally supplied in absolute versions. Gauge versions are available
upon request.

SPECIFICATIONS

Pressure Ranges (FS)
Version Absolute / Gauge 0,5 1251020bar
Overpressure 23481530bar

Typ 2-Wire 3-Wire 3-Wire
Excitation (U) 8…28 VDC 8…28 VDC 13…28 VDC
Signal Output 4…20 mA 0…20 mA 0…10 V
Load Resistor (Ω) ≤(U-8V)/0,02A ≤(U-5V)/0,02A >2kΩ

Linearity 0,2% FS typ. 0,5% FS max.
Stability 0,1% FS typ. 0,2% FS max.

Operating Temperature 20…150°C

- Temp. Coeff. of Zero 0,015% FS/°C

- Temp. Coeff. of Sensitivity 0,015%/°C

Electrical Connection Binder Plug Series 723; 8-pole
Material in Contact with Medium Stainless Steel AISI 316, Viton- or Silicone O-Ring
Protection IP65

Options - Cable with reference tube for gauge version

- Platinum diaphragm, Hastelloy housing

- Programmable Version (25HT-PRO)

ELECTRICAL CONNECTIONS

4...20 mA 0...20 mA 0...10 V
+ IN 4 4 4
+ OUT 6 6
GND 8 8 8

PROGRAMMABLE OPTIONS

VPROG 2 2 2
DATA 3 3 3
WRITE 5 5 5
CLOCK 7 7 7

PIN CONFIGURATION,
P

LUG

2

5

3

7

8

6

1

4

Plan 8931 A

Plan 8931

8-pol Binder-Gerätestecker
Serie 723

8-pol Binder-Gerätestecker
Serie 723

~ 90~ 10

ø 24

~ 90~ 10

41,5

5

ø 20

ø 20

O-Ring
ø 13,92 x 2,62

6,5

9

ø 24

O-Ring
ø 13,92 x 2,62

3

ø 18,95

ø 15

3

ø 15

ø 18,95