Keller Swiss-Built Series 33XEi-35XEi-36XWEi High accuracy analog digital output intrinsically safe pressure transmitter

These piezoresistive pressure transmitters are approved for use in hazardous areas of groups I (mining industry) and II (industrial applications) where there is a high risk of explosion. Signal processing This series features microcontroller-based electronic evaluation to ensure maximum accuracy. Each transmitter is gauged across the entire pressure and temperature range. This measurement data is used to calculate a mathematical model that enables correction of all reproducible
errors. In this way, KELLER can guarantee high accuracy as an error band within the overall compensated pressure and temperature range. Two compensated temperature ranges are available for industrial transmitters, according to choice: -10…80 °C and 10…40 °C. The level probes are gauged in the 0…50 °C temperature range only. The calculated pressure value can be read via the interface, and is simultaneously processed as an analog signal. Interface The interface is designed as a robust RS485 half-duplex for 9’600 and 115’200 baud. It can be used to implement bus systems with 128 subscribers and line lengths of up to 1400 m. There is an external leadthrough for the interface on all products except the version with the DIN 43650 plug. Communication protocol: KELLER Bus and MODBUS RTU. The transmitters can be configured and the measured values can be recorded with the CCS30 software:
- Read out current measured pressure and temperature values with maximum resolution Speed: at 115’200 baud, up to 330 measured values per second (depending on the converter)
- Call up information and status (pressure and temperature ranges, serial number, software version, etc.)
- Reprogram analog output (e.g. different units or pressure range)
- Calibration: zero point and amplification can be adjusted
- Special calculations, such as non-linear curve adaptation or root calculation for flow
- Possibility of adjusting the low-pass filter and the communication parameters

Specifications
   Standard Pressure Ranges (FS) and Overpressure in Bar
PR-33 X Ei, PR-35 X Ei,
PR/PA(A)-36 XW Ei 1 3 10 30
PA(A)-33 X Ei, PA(A)-35 X Ei 0,8…1,2 3 10 30 100 300 700 1000
(pressure ranges Series PD-33 X Ei on request)
Overpressure 2 5 20 60 200 400 1000 1100
PAA: Absolute. Zero at vacuum  PA: Sealed Gauge. Zero at atmospheric pressure (at calibration day)  PR: Vented Gauge. Zero at atm. pressure  PD: Differential
   (digital) (analog) (analog) (analog) Low Voltage (LV)
Output   RS 485 4…20 mA (2-wire) 0…10 V (3-wire) 0…5 V (3-wire) 0,1…2,5 V (3-wire)
Supply (U)  10…30 Vcc 10…30 Vcc 15…30 Vcc 10…30 Vcc 3,5…6,4 V
Accuracy @ RT   0,02 %FS typ. 0,03 %FS typ.
(1)
0,03 %FS typ. 0,03 %FS typ. 0,03 %FS typ.
Error Band (10...40 °C)   0,05 %FS 0,10 %FS
(1)
0,10 %FS
(2)
0,10 %FS
(2)
0,10 %FS
Error Band (-10...80 °C)
(3)
0,10 %FS 0,15 %FS
(1)
0,15 %FS
(2)
0,15 %FS
(2)
0,15 %FS
Power consumption (without communication) < 8 mA 3,2…22,5 mA < 8 mA < 8 mA < 3 mA
(1) 
Disturbance of the 4...20 mA signal occurs during communication through RS485. Use the 3-wire type, if you need the
 
analogue output and the RS485 at the same time
(2) 
Without burden of the voltage output (Ri
 = 100 Ω). With burden Ra
 = 100 KΩ the error increases by 0,1 %FS.
(3) 
Compensated temperature range for Series 36 XW Ei: 0…50 °C
True Output Rate (preset) 400 Hz  (33 X Ei) 100 Hz (35 X Ei, 36 XW Ei)
Resolution   0,002 %FS
Long Term Stability typ. Range ≤ 1 bar: 1 mbar
   Range > 1 bar: 0,1 %FS
Load Resistance (kΩ) <(U-10 V) / 25 mA (2-wire)
Electrical Connection DIN 43650*, Binder Series 723*, M12, MIL-C 26482,
   Subconn BH MSS and MCBH MSS or cable
    * Mating connector included
Power-ON time < 600 ms
Insulation   10 MΩ / 500 V
Storage Temperature Range -40…+120 °C
Operating Temperature Range -40…+100 °C for T4
   -40…  +85 °C for T5  
   -40…  +70 °C for T6 
Pressure Endurance 10 Million Pressure Cycles 0…100 %FS @ 25 °C
Vibration Endurance, acc. to IEC 68-2-6 20 g (5...2000 Hz, max. amplitude ± 3 mm)
Shock Endurance 20 g (11 ms)
Protection   IP 65    optional: IP 67 or IP 68 (with cable)
CE-Conformity EN 61000-6-2:2005 / EN 61000-6-3:2007 /
   EN 61326-2-3:2006
Material in Contact with Media Stainless Steel 316L (DIN 1.4435) / Viton®
Weight   Series 33 X Ei ≈ 140 g; Series 35 X Ei ≈ 160 g
   Series PD-33 X Ei ≈ 500 g
Dead Volume Change < 0,1 mm3

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