PR-21Y / 10BAR / 81554.33 / 4-20MA

## Piezoresistive Pressure transmitters 

## series 21 Y 

## for industrial aPPlications 

Technology: The Y-line transmitters have an extremely small temperature error. This is achieved using an additional circuit containing a temperature sensor that subdivides the temperature range into fields that are 1,5 Kelvin (K) wide. The TK zero and TK compensation values are calculated for each field and programmed into the additional circuit. During operation, these values are fed into the analogue signal path depending on the temperature. Each temperature is the „calibration temperature” for this transmitter. The accuracy thereof is mainly determined by linearity. 120 fields are available, representing a possible temperature range of 180 K. The wider the temperature range, the greater the amount of testing that is needed to minimise the inaccuracy of the mathematical model. 

Flexibility: The extent of the vertical range of manufacture, the modular design and the programmable electronics make it possible to manufacture large, customer-specific batches. The pressure sensors (insulated measuring cells) are manufactured in large quantities and kept in stock. These are then welded into the required transmitter head, equipped with electronics and calibrated over the entire temperature and pressure range in systems with up to 1000 measuring stations. 

mPm connectors, M12 connectors, Packard connectors and cable connections are used as standard for the electrical connection. In the relative pressure version, the ambient pressure is led into the interior via cable or connector. 

~~—~~ Outputs: A 2-wire (4…20 mA) or 3-wire version with voltage output is available as an output signal. For a ratiometric 0,5 to 4,5 V version, we refer to the KELLER Series 21 G product range. 

EMC: The 21 Y product line is outstanding due to its extreme ruggedness towards electromagnetic fields. The limits of the CE standard are undercut by a factor of up to 10 with conducted and radiated fields. These transmitters are also extremely immune to external voltages between the housing and the electrical connection, which is particularly important when frequency converters are being used. The high insulation voltage of 300 V make this product ideal for use in the harshest of environments. 

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Subject to alterations 

KELLER AG für Druckmesstechnik KELLER Ges. für Druckmesstechnik mbH 

07/08 St. Gallerstrasse 119 CH-8404 Winterthur Tel.  +41 (0)52 - 235 25 25 Fax  +41 (0)52 - 235 25 00 Schwarzwaldstrasse 17 D-79798 Jestetten Tel.  +49 (0)7745 - 9214 - 0 Fax  +49 (0)7745 - 9214 - 60 

Companies approved to ISO 9001:2000 

www.keller-druck.com 

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## KELLER 

## **Specifications** 

Pressure Ranges (all intermediate ranges possible) 

PR-21 Y 2…10 bar FS PAA-21 Y  /  PA-21 Y 2…1000 bar FS Overpressure 2 x pressure range, max. 1100 bar 

PAA: Absolute. Zero at vacuum PA: Sealed Gauge. Zero at 1000 mbar abs. PR: Vented Gauge. Zero at atmospheric pressure 

Accuracy 

Linearity (best fitted straight line) 1) typ. ±0,25 %FS max. ±0,5 %FS Total Error Band 2) 0...50 °C max. ±1,0 %FS -10...80 °C max. ±1,5 %FS 

1)  including Hysteresis + Repeatability            2)  Linearity + Hysteresis + Repeatability + Temp. Coeff. + Zero + Span Tolerance 

|Storage-/Operating Temperature<br>Stability<br>PR-Version<br>PAA/PA-Version|-40…100 °C<br>max. ±0,5 %FS<br>max. ±0,3 %FS|||
|---|---|---|---|
|Type<br>Signal Output<br>Limitation Signal Output<br>Supply<br>Load Resistance<br>Limiting Frequency<br>Power Consumption<br>Electrical Connection<br>Pressure Connection<br>Response Time (Supply ON)<br>Isolation<br>EMC<br>Dead Volume Change<br>Material in Media Contact<br>Protection Class<br>Weight<br>Endurance<br>Oil Filling|2-Wire<br>3-Wire<br>3-Wire<br>**4...20 mA**<br>**0...10 V**<br>**0,5…4,5 V**<br>3,2...22,3 mA<br>-1,2...11,2 V<br>0,1...4,9 V<br>8...32 VDC<br>13...32 VDC<br>8...32 VDC<br>< (U-8 V) / 0,025 A<br>> 5 kΩ<br>> 5 kΩ<br>2 kHz<br>2 kHz<br>2 kHz<br>max. 5 mA<br>max. 4 mA<br>- Plug: M12 (4-pole), Packard, mPm<br>- Cable<br>G1/4” male, G1/8” male, 7/16”-20 UNF male and female<br>(0…99 %) < 5 ms<br>> 10 MΩat 300 VDC<br>EN 61000-6-2: 2005  /  EN 61000-6-3: 2007  /  EN 61326-2-3: 2006<br>< 0,1 mm3<br>- Stainless Steel AISI 316L (1.4404/1.4435)<br>- Viton®Seal external (no internal seals)<br>M12-/Packard-Plug:<br>IP67 (with corresponding mating plug)<br>mPm-Plug:<br>IP65 (with corresponding mating plug)<br>Cable:<br>IP54<br>≈38 g (G1/8”)≈50 g (G1/4”)<br>>10million cycles, 0…100 %FS at 25 °C<br>Silicone oil|||



**Options** Temperature Range Other temperature ranges on request. Maximal range: -40…+120 °C Oil Filling Fluorocarbon oil (O2-compatible), olive-oil, lowest temperature oil (-55 °C) Pressure Connection, Electr.ical Connection Others on request 

Subject to alterations 07/08 KELLER AG für Druckmesstechnik St. Gallerstrasse 119 CH-8404 Winterthur Tel.  +41 (0)52 - 235 25 25 Fax  +41 (0)52 - 235 25 00 KELLER Ges. für Druckmesstechnik mbH Schwarzwaldstrasse 17 D-79798 Jestetten Tel.  +49 (0)7745 - 9214 - 0 Fax  +49 (0)7745 - 9214 - 60 

www.keller-druck.com 

Companies approved to ISO 9001:2000