KELLER PIEZORESISTIVE TRANSMITTERS AND TRANSDUCERS SERIES 21 R INDUSTRIAL APPLICATIONS. ABSOLUTE AND GAUGE REFERENCES. This new range of KELLER OEM pressure transmitters and transducers offers the user the high accuracy and stability of the KELLER piezoresistive pressure capsule in a low cost OEM package. Applications include refridgeration, hydraulic controls, air compressors, ink jet printers, vacuum pumps etc. The silicon sensor is mounted in an all welded oil filled stainless steel capsule, providing a highly stable measuring cell with negligible hysteresis, unrivalled linearity, high output and a life of millions of pressure cycles. The Series 21R use the Series 6 capsule, which is of all welded 316L stainless steel construction. Transducers are supplied with 2 metres of screened cable, or a square connector and mating plug, type mPm-193. Accuracy is achieved by very large scale predictable production quantities of the pressure capsule (over 2 million produced today). Reliability is assured by the inherent properties of the perfectly elastic silicon chip, and ensuring that neither the pressure media nor the reference media (in the gauge version) come into contact with any sensitive parts. Temperature Compensation: Each unit is fully tested and compensated. Span errors are reduced by selecting the semiconductor doping levels so that the gauge factor of the strain gauges (∆R) is constant with temperature. Thermal zero compensation is achieved by an automatic test procedure which fits a single resistor across one arm of the bridge. Shock and vibration performance is excellent due to the silicon chip being suspended in the oil-filled capsule. It is isolated mechanically from the body. Similarly, the effects of mounting torque are eliminated. SERIES 21R WITH CABLE (PLAN 80096.2) ELECTRICAL CONNECTIONS 2-WIRE G 1/4" 3-WIRE GREEN ø 17 ø 18,6 Cable Connection ~ 50 GND (WHITE) WHITE OUT/GND +OUT +OUT (RED) BROWN +VCC +VCC +VCC (BLACK) -OUT (BLUE) HEX 19 SERIES 21R WITH PLUG (PLAN 80096.3) mPm-Connector (Contact Spacing 9,4 mm) HEX 19 1 2-WIRE 3-WIRE 4-WIRE OUT/GND GND GND 2 G 1/4" 3 ø 17 +VCC 4 12 8 4-WIRE GND +OUT +OUT +VCC +VCC -OUT ~ 56 Subject to alterations KELLER AG für Druckmesstechnik KELLER Gesellschaft für druckmesstechnik mbH Companies approved to ISO 9001 / EN 29001 St. Gallerstrasse 119 Schwarzwaldstrasse 17 CH-8404 Winterthur D-79798 Jestetten 4/99 Tel. 052 - 235 25 25 Tel. 07745 - 9214 - 0 Fax 052 - 235 25 00 Fax 07745 - 9214 - 50 Internet: http://www.keller-druck.ch druckmesstechnik KELLER SPECIFICATIONS SERIES 21 R PR 21 R * 0,5 1,0 1,6 2,5 6 10 16 bar vented gauge PAA 21 R 1,0 1,6 2,5 6 10 16 bar absolute PA 21 R 1,0 1,6 2,5 6 10 16 25 50 100 160 250 400 600 bar 2,5 3 6 8 15 25 60 75 150 250 600 600 800 bar Over Range 2 sealed gauge * mPm connector only, not cable Transmitter Signal Output Transducer 4…20 mA 0…5 Vdc Supply Voltage 1…6 Vdc 8…28 Vdc Current required up to 20 mA Zero/Span Tolerance 1% FS Configuration 2 wire Electrical Connection: OUT/GND: Pin 1 / White GND: +Vcc: Pin 3 / Brown 0…100 mV 13…30 Vdc 8…28 Vdc. 1% FS** ±0,1% FS 4 mA max. 1% FS** 1% FS 10 Vdc 2 mA max. 3 wire mPm 193 micro or cable 2m, 4 core 0…10 Vdc 4 wire Pin 1 / Green GND: +OUT: Pin 2 / White +OUT: Pin 2 / Red +Vcc: Pin 3 / Brown +Vcc: Pin 1 / White Pin 3 / Black -OUT: Pin 4 / Blue Linearity 0,2 % typ. / 0,5% max. Total Error Band* +18…+22°C 1% max. / 0,5% typ. 0,2% typ. / 0,5% max. 0,5% max. Total Error Band* 0…+50°C 2% max. / 1,0% typ. 1,0% max. Total Error Band* -20…+80°C 4% max. / 2,5% typ. 2,5% max. * Total error band includes linearity, hysteresis, zero and span offsets, temperature effects and repeatability. **Signal at zero ≈ 50 mV --> see chart Signal at zero for 0…5 V (0…10 V) transmitters 5V/10V ≈ 50 mV FS 1%FS Maximum Temperature -20…+80°C (on demand -40…100°C) Pressure Port G 1/4 male parallel to ISO 228 (1/4”BSP) Pressure Media Compatible with 316L stainless steel Weight 75 gramme Electromagnetic Compatibility CE marked: Fully tested to EN 50082-2 and EN 50082-1 Enclosure Protection IP65 Insulation Greater than 100 MΩ at 50 Vdc Insulation Test 1 minute at 500 Vdc User Notes: Basic 100 mV transducers are calibrated at 10 Vdc to produce 0…100 mV signal (nominal), and require a stable voltage supply. They can be operated at 5 Vdc to give 0…50 mV signal or 20 Vdc to give 0…200 mV signal. The circuit is a compensated resistance bridge and is completely passive with no diodes or reactive components. Bridge resistance is 3,5KΩ nominal. The 8…28 V supply transducer is fitted with an internal regulator. The mPm micro connector has a PG7 cable gland entry suitable for cables between 4 and 6 mm diameter. Screw terminals and solder lags are provided. The G 1/4 pressure connection has an integral Viton seal at the shoulder. Alternatively it may be sealed using a face seal on the flat nose of the pressure port. Subject to alterations KELLER AG für Druckmesstechnik KELLER Gesellschaft für druckmesstechnik mbH Companies approved to ISO 9001 / EN 29001 St. Gallerstrasse 119 Schwarzwaldstrasse 17 CH-8404 Winterthur D-79798 Jestetten 4/99 Tel. 052 - 235 25 25 Tel. 07745 - 9214 - 0 Fax 052 - 235 25 00 Fax 07745 - 9214 - 50 Internet: http://www.keller-druck.ch