High precision pressure transmitter with an accuracy of 0.1%FS BSL NLHR and digitally adjustable pressure ranges from 400mb up to 40 bar gauge & absolute.
- Pressure Ranges: 0.4 up to 40 bar gauge or absolute
- Accuracy: 0.1% full scale
- Output Signal: 4-20mA or 0-10V dc output signal, RS485 ModBus RTU (14 bit res)
- Electrical Connections: DIN 43650 (ISO4400) plug and socket, Binder 5 or 7 pin connector, M12 x 1 4 pin connector, IP67/68 cable outlet and field housing
- Pressure Connections: G1/4, G1/2, DIN3852 and EN837, G1/2 flush, G1/2 open port, 1/4NPT male, 1/2NPT male
- Media Compatibility: SS316L pressure port and diaphragm, FKM internal seals
- Special Features: 10 to 1 maximum turndown adjustment of pressure range via RS232 interface
- Special Options: ATEX and IECEx approval for Intrinsic safety II 1 G EEx ia IIC T4
The DMP 331i high accuracy pressure transmitter sensor uses a silicon strain gauge diaphragm housed in an oil filled capsule and the repeatable & low hysteresis properties of silicon are exploited by the digital amplifier with 14 bit A/D conversion to provide a highly precise pressure measurement over the operating temperature range.
The DMP-331i high accuracy pressure transmitter is available with ATEX/IECEx approval for intrinsically safe use in hazardous environments
Temperature error 80-90°C
I am considering the DMP331i high accuracy pressure transducer for a high temperature application at about 80°C to 90°C steam temperature. How will this impact the 0.1% full scale accuracy indicated for the DMP331i and what could be done to limit this impact?
The 0.1% FS accuracy does not include the temperature error which is an additional 0.02%FSO/10K = 0.02%/10K. So from a room temperature of approx. 20°C to a temperature of 90°C, the additional error could be as much as 0.12% FS (o.22% FS in total).
To reduce this additional temperature error and assuming you have the ability to calibrate the sensor when the temperature is between 80 and 90°C, you can treat the error from room temp up to 90degC as a calibration shift, since you are only interested in optimising performance between 80 and 90°C. So the easiest way to reduce the temperature error is to check the output signal at zero and full scale pressure when the temperature is at it’s mid-point i.e. 85°C. The temperature error will then become 0.02% FS over the 10°C (10K) temperature band, or 0.12% FS when combined with the room temperature pressure accuracy.
If you are not able to set full scale pressure, an even simpler method is to to just check the zero shift at 85°C since most of the thermal error is typically contributed by the thermal zero shift.
Accuracy of 2000 mbar range re-scaled to 1200 mbar
In terms of accuracy, what does the 0.1% FSO mean for a DMP331i high accuracy pressure transmitter scaled to 1200mbar, does that mean it will measure within plus/minus 1.2mbar?
Yes this is correct for the room temperature accuracy. According to the data sheet spec the DMP331i is +/-0.1% FS within the 5:1 turndown range of the output. So a 2 bar range scaled to 0 – 1200 mbar would be within the 5:1 limit, and therefore the accuracy would be +/-1.2 mbar at room temperature.
However if the measurement is not taken at room temperature you will also need to consider the temperature error which is an additional 0.02%FSO/10K x Turn down would be 0.02% x 2000mbar/1200mbar = +/-0.4mbar/10K.
Adjusting 35 bar range to 400 psi & 100 psi
Can a 35 barg range DMP331i pressure transmitter be re-ranged to measure 0 to 400psi and 100psi?
Yes, it can be turned down by as much as 10:1, so in this case the user can adjust the range to 0 to 3.5 bar (52.50 psi) if necessary. The range is only configurable via the optional RS232 interface and software.
If the required ranges are fixed and unlikely to be changed in the future, they can be set in the factory without the need for purchasing the re-ranging option.
Specification data sheet
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