Keller Swiss-Built Series 21Y Piezoresistive transmitters for industrial applications. absolute and gauge references
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 ields that are 1,5 Kelvin (K) wide. The TK zero and TK compensation values are calculated for each ield 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 ields 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-speciic 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 ields. The limits of the CE standard are undercut by a factor of up to 10 with conducted and radiated ields. 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.
Speciications
Pressure Ranges (all intermediate ranges possible)
PR-21 Y 2!-10 bar FS
PAA-21 Y / PA-21 Y 2!-100 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
1)
Linearity (best itted straight line) typ. !à0,25 %F max. !à0,5 %F
2)
Total Error Band 0...50 !a max. !à1,0 %F
-10...80 !a max. !à1,5 %F
1) 2)
including Hysteresis + Repeatability Linearity + Hysteresis + Repeatability + Temp. Coeff. + Zero + Span Tolerance
Storage-/Operating Temperature -40!-100 !
Stability PR-Version max. !à0,5 %F
PAA/PA-Version max. !à0,3 %F
Type 2-Wire 3-Wire 3-Wire
Signal Output 4...20 mA 0...10 V 0,5!-4,5
Limitation Signal Output 3,2...22,3 mA -1,2...11,2 V 0,1...4,9 V
Supply 8...32 VDC 13...32 VDC 8...32 VDC
Load Resistance < (U-8 V) / 0,025 A > 5 k > 5 k
Limiting Frequency 2 kHz 2 kHz 2 kHz
Power Consumption max. 5 mA max. 4 mA
Electrical Connection - Plug: M12 (4-pole), Packard, mPm
- Cable
Pressure Connection G1/4!± male, G1/8!± male, 7/16!±-20 UNF male and fem
Response Time (Supply ON) (0!-99 %) < 5 m
Isolation > 10 M at 300 VDC
EMC EN 61000-6-2: 2005 / EN 61000-6-3: 2007 / EN 61326-2-3: 2006 3
Dead Volume Change < 0,1 mm
Material in Media Contact - Stainless Steel AISI 316L (1.4404/1.4435)
- Viton Seal external (no internal seals)
Protection Class M12-/Packard-Plug: IP67 (with corresponding mating plug)
mPm-Plug: IP65 (with corresponding mating plug)
Cable: IP54
Weight 38 g (G1/8!±) 50 g (G1/4!±
Endurance > 10 million cycles, 0!-100 %FS at 25 !
Oil Filling Silicone oil
Options
Temperature Range Other temperature ranges on request. Maximal range: -40!-+120 !
Oil Filling Fluorocarbon oil (O -compatible), olive-oil, lowest temperature oil (-55 !aC2
Pressure Connection, Electr.ical Connection Others on request
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