Keller Swiss-Built Series 23Ed/25Ed Flameproof pressure transmitters 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). nalog transmitters, Series 23 Ed and 25 Ed This series is based on the stable piezoresistive transducer with analog electronics. The zero oint and sensitivity, and the temperature coefficients for the zero point and sensitivity, are compensated by resistors and/or potentiometers.
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 maximum 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.

SpecificationS
                                           Standard Pressure Ranges (FS) and Overpressure in bar
PR-23/25 Ed, PR-33/35 X Ed -1 1 3 10 30
PA(A)-23 Ed, PA(A)-33 X Ed 1 3 10  30 100 200 300
PA-25 Ed, PA-35 X Ed 1 3 10 30 100
Overpressure -1 3 7 20 60 200 300 450
PAA: Absolute. Zero at vacuum      PA: Sealed Gauge. Zero at 1000 mbar abs.      PR: Vented Gauge. Zero at atmospheric pressure
Stability    0,1 %FS typ.  (FS > 1 bar)               1 mbar typ. (FS ≤ 1 bar)
Series 23 Ed / 25 Ed
Accuracy @ RT
(1)
0,2 %FS typ. 0,5 %FS max.    
Compensated Temperature Range -10...80 °C 
Storage- / Operating Temperature
(2)
-30...100 °C      
Temperature Coefficients… …of Zero …of Sensitivity
· FS > 1 bar 0,01 %FS/°C max. 0,02 %/°C max.
· FS 1 bar 0,02 %FS/°C max. 0,02 %/°C max.
· FS 0,5 bar 0,03 %FS/°C max. 0,02 %/°C max.
· FS 0,2 bar 0,05 %FS/°C max. 0,02 %/°C max.
Series 33 X Ed / 35 X Ed analog digital
Accuracy @ RT
(3)
0,03 %FS typ.
(4)
0,02 %FS typ.    
Error Band (10…40 °C) 0,1 %FS
(4)
0,05 %FS
Error band (-10…80 °C) 0,15 %FS
(4)
0,1 %FS
Storage- / Operating Temperature
(2)
-30...100 °C      
(1)
Linearity (best straight line through zero) + hysteresis + repeatability
(2)
T4 for Ta
 ≤100 °C, T5 for Ta
≤95 °C, T6 for Ta
≤80 °C
(3)
Linearity (BFSL) + hysteresis + repeatability 
(4)
 Disturbance of the 4...20 mA signal occurs during communication through RS485.
    2-Wire 3-Wire Digital (only 33/35 X Ed)
Signal Output 4...20 mA  0...10 V RS 485
Supply (U) 8...32 Vcc 13...32 Vcc 8...32 Vcc / 3,5…12 Vcc
Load Resistance (RΩ) (U-8 V) / 0,025 A > 5 k  
Electrical Connection PUR-cable, length 2 m (with PE-sheath and reference tube for gauge). Others on request.
Volumetric Change < 0,1 mm3
 / FS
Pressure Connection G 1/4″, G 1/2″, G 3/4″, 1/2″-14 NPT, 1/4″-18 NPT
Material in Media Contact Stainless steel 1.4435 (316L), Viton®
Protection IP50 (IP65/IP68 on request)
EMC Conformity EN 61000-6-2:2005 / EN 61000-6-3:2007 / EN 61326-2-3:2006
Weight PR/PA/PAA ≈ 200 g
Insulation > 10 MΩ @ 50 V
Endurance > 10 million cycles 0…100 %FS at 25 °C
Optionen
Pressure Connection On request
Pressure Ranges   All pressure ranges between 0,1 and 300 bar
Material in Media Contact Hastelloy C-276 (C-22), gold-plated. Others on request.
Oil Filling Fluorized oil (O2
-compatible), olive-oil, low temperature oil

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