Piezoresistive Pressure Transducers
Pressure transducers with laser-welded stainless-steel diaphragm
Pressure transducers for high pressure Series 6 L HP / 7 L HP / 8 Series 7 LI – Inconel™ up to 200 °C
Series 3 L to 9 L – compact designs ø 9,5 to 19 mm Series 10 L – “the original” ø 19 x 15 mm
w Pressure ranges from 200 to 1500 bar w Absolute pressure w Signal output typ. 200 mV @ 1 mA supply w Individual calibration certificate (including compensation values)
w Pressure ranges from -1 to 1000 bar w Absolute, relative and differential pressure w Signal output typ. 200 mV @ 1 mA supply w Individual calibration certificate (including compensation values) w Very high long-term stability w Temperature ranges from -55 to 150 °C w Integrated temperature sensor (top of bridge) w Housing optionally made from Hastelloy® and Titanium w Mathematical modelling on customer request
w Very high long-term stability w Robust and corrosion-resistant w Optionally available with integrated PT1000 temperature sensor w Also available as a screw-mounted housing with metallic seal w Mathematical modelling on customer request
OEM Pressure Transmitters
OEM pressure transmitters are built to various levels of comple tion to meet customer’s integration needs: these unique products can thus be supplemented with electronics and calibrations, for example.
9 LY
10 LX 9 FL
Housing components such as pressure connections can be made on customer request thanks to the high degree of vertical integration.
9 FLX
6S
20 SX
23 SX
Every mechanical expansion stage of a complete pressure trans mitter can become a sales product (see exploded view).
Calibration
-------------------------------------------------------------------- 134 PA-10L/20 BAR/81838.3 (1) SN E133755 (2) ------------------------------------------------------------------------ (3) Temp (4) Zero (5) +1000 (6) Comp (7) dZero [°C] [mV] [mV] [mV] [mV] -9.8 0.0 -2.6 0.4 0.2 -0.6 0.1 -2.6 0.4 0.1 21.8 0.2 -2.8 0.2 0.0 49.4 0.5 -2.9 0.0 -0.2 79.6 0.8 -3.2 -0.2 -0.4 ----------------------------------------------------------------------L1 COMP R1 1000 kOhm, (8) R4 12.0 Ohm (8) RB 3465 Ohm (8) ZERO 0.2 mV (9) P_atm 965 mbar (10) SENS 8.43 mV/bar at 1.000 mA(11) (14) (15) Lnorm Lbfsl (13) (12) [bar] [mV] [%FS] [%FS] 0.000 0.0 0.00 -0.11 5.000 42.4 0.14 0.07 10.000 84.5 0.15 0.11 15.000 126.5 0.04 0.04 20.000 168.3 -0.15 -0.11 ------------------------------------------------------------------------Long Term Stability Ok (16) Lot 70590 (17) Test 500 Volt ok (18) Supply 1.000 mA (19) 20.06.15 (20) --------------------------------- PH02.A03DqK (20)
At KELLER, all pressure measu ring devices are calibrated for pressure and temperature. Depending on the product’s expan sion stage, an electronic circuit is responsible for compensating and processing the signals, or else the sensor’s calibration data are pro vided (calibration certificate left).
Standard Transmitter
Digitally compensated Transmitter
Error in mbar 100
Error in mbar 100
50
50
0
0
-50
0
-100
-10 °C
10
25 50 Temperature
80 °C
-50
2 -100 4 ure 6 ss -10 °C 8 pre r 10 rget n ba i Ta
10
25 50 Temperature
80 °C
0 2 4 ure 6 ss 8 pre r 10 rget n ba i Ta
KELLER compensated pressure transmitters are provided with an indication of the total error band – a maximum signal variation in a defined temperature range. In addition, test reports can be displayed, with measurement data recorded at a minimum of 3 temperatures and 4 pressure points.
The following is an example of the effect of digital compensation of the X-line with a resulting typical error band of only 0,05 %FS from -10 to 80 °C.
-3-