Keller OEM Series 4LD / 9LD Piezoresistive OEM Pressure Transmitters (with I2C interface and embedded signal conditioning)
With the D-line, Keller introduces a unique combination consisting of an exceedingly robust industrial pressure transducer and the popular I2 C microcontroller interface. Pressure transmitters with this interface are commonly available only in consumer market housings made of plastic or ceramic, where merely the parameters for compensation are stored in an integrated memory. The D-line OEM transmitters however have an unprecedented embedded digital signal processing (DSP) core for the compensation and normalization of the output values. Technology The Series 4 LD...9 LD is based on KELLER’s famous Chip-In-Oil (CIO) technology. The “L”stands for the laser welded stainless steel housing and could equally be representative for lowpower (typ. 0,1 µA in idle/sleep mode) and low-voltage (Supply: 1,8...3,6 VDC). The housing is
hermetically-sealed, oil-filled and builds a Faraday cage with feed-through capacitors around the entire electronics. The digital interface of the electronics with dual information of pressure and temperature is indicated by the “D”.
Interfaces The easiest way to couple an OEM pressure transmitter to a microcontroller based system is a digital I/O-compatible interface; no amplification, no analog to digital conversion, no calibration, no temperature coefficients. In short: no problems.C (Inter-Integrated Circuit) is designed for a direct connection between devices on a printed circuit board. It is a BUS-system because it allows the connection of multiple transmitters (slaves) to the same communication lines, but it is not a fieldbus with the classic long distance inter-connectability. So the D-Line combines an industrial pressure interface for harsh environment with an electrical interface for OEM applications. The values are in 16 Bit unsigned integer format and the scaling is given by constants or by the memory content of the transmitter (two floating point values IEEE 754 for the pressure scaling).
Performance features
• Ultra low power consumption, optimised for battery powered applications
• Hermetically protected sensor electronics – extremely resistant to environmental influences
• Ultra-compact, robust housing made from stainless steel (optional Hastelloy C-276)
• No external electronics for compensation or signal processing
• Extremely accurate, outstanding long-term stability, no hysteresis
• Pressure ranges of 1 bar to 1000 bar
• Easy to integrate into microcontroller based systems
• Internal two-chip solution with pressure sensor and signal processing separation provides a high degree of flexibility
Interface digital I
2
C (serial synchronus)
Signal Output P [bar], T [°C]: normalised to 16 Bit unsigned integer
Signal Reserve typ. ± 10 %FS, min. ± 5 %FS
Supply 1,8…3,6 V
Power Consumption typ. 1,5 mA during conversion
typ. 100 nA in idle mode
Bit Rate ≤ 3,4 MHz
Start-up Time (Supply ON) < 3 ms
Conversion Time < 6 ms (for P and T)
Noise Floor max. ± 0,015 %FS (temperature 4 Bit)
Temperature Accuracy typ. ± 2 °C
Supply Voltage Dependency none
Isolation > 100 MΩ @ 500 VDC
ESD – Human Body Model > 4 kV (HBM: C = 100 pF / R = 1,5 kΩ)
Material in Contact with Media - Stainless Steel AISI 316L (DIN 1.4404 / 1.4435)
- O-Ring: Viton®
Shore A (exchangeable)
Oil Filling Silicone oil, others on request
Pressure Endurance 0…100 %FS @ 25 °C: > 10 million pressure cycles
with appropriate installation
Vibration Endurance 20 g, 5…2000 Hz, X/Y/Z-Achse
Shock 75 g sine 11 ms
Electrical Connection - Glass feed through pins ø 0,45 mm, L = 4 ± 0,5 mm
- Plug JST 1 mm, 5-pole. Type: BM05B-SRSS-TB.
Only for -20…85 °C and not for 4 LD & 6 LD
As counterpart: Crimp-socket with wires AWG 28.
Type: SHR-05V-S-(B), Crimp-contact: SSH-003T-P0.2
Options - Electrical connection: 7 cm silicone wires 0,09 mm2
on the glass feed through pins
- Hastelloy housing (dep. on version also Inconel, Titanium)
- Extended temperature range within -40…110 °C
Other possible versions - Series 9 LD: With pressure range 300 mbar
- Series 20 D: With pressure connection G1/4”, G1/8” etc.
- Series 21 D: With screened cable (0,5 to 3 m)
Remarks - Intermediate press. ranges only for high-volume projects
- Series 21 D is not available with plug (I2C is not a fieldbus)
Write a review
Your Name:Your Review: Note: HTML is not translated!
Rating: Bad Good
Enter the code in the box below:
