The DPT 100 is a high-accuracy differential pressure transmitter designed for fast test processes in leakage and flow measurement applications where rapid response time and high sampling rates are essential.
Product Features
- High Accuracy: 0.1% FSO accuracy according to IEC 60770.
- Wide Pressure Range: Differential pressure measurement from 10 mbar up to 20 bar,
- with a maximum static pressure of 400 bar.
- Fast Response Time: 10 ms response time (10…90%).
- Versatile Output: 4…20 mA 2-wire output or RS485 with Modbus RTU protocol.
- Robust Construction: Aluminum die-cast case with epoxy painting.
- Easy Zero Adjustment: Convenient zero adjustment via switch.
- Optional Process Connections: Various process connections available.
Product Description
The DPT 100 offers an optional RS485 interface with Modbus RTU protocol, a widely adopted open protocol in industrial communication. This allows for seamless integration into existing industrial automation systems and provides flexibility for data acquisition and control.
Product Help
Liquid level measurement installation in sealed container
I am planning on using this sensor to measure liquid level in a sealed container, would the arrangement be correct, that the positive side leg needs to be filled with the liquid, and the negative side leg open to the feeding line at the top of the container, which will be filled with liquid vapour?
Yes, but if liquid vapour condenses in the feeding line this will create a changing liquid head which will affect the zero calibration.
Symmetric pressure range meaning
On the product data sheet for the DPT100, what is the meaning of ‘pressure range PN diff.’ and ‘pressure range PN symmetric (diff)’, one is 60 mbar and the other +/-60 mbar?
Symmetric is another calibrated pressure range option, and it means that it has the same range in the negative and positive direction either side of the zero point. For +/- 60 mbar, this is two ranges together 0 to -60 mbar, and 0 to +60 mbar. The range 60 mbar is simply a single positive range of 0 to +60 mbar.
Installation mounting position affect on accuracy
What is meant in the specification sheet about ‘Influence installation position: max. 400 Pa (can be compensated about zero-point correction) If pressure is under 60 mbar the order has to be in mounted position’?
It relates to the ‘g’ effect, on lower ranges diaphragms and oil fills will be affected by gravity in different orientations, so that the effect on calibration is noticeable (normally as a zero shift). So if you indicate the installed orientation in your application it is possible to calibrate it with the same orientation in the factory.
Varying static line pressure influence on accuracy
Our plan is to run tests at different static pressures ranging from 2 to a maximum of 40bar, however most of the experiments will be run below 10bar static line pressure. It states for the 60mbar sensor that the influence is 30 Pa/100bar. How do I interpret this, is there a formula I can use to compensate for the line pressure?
No, it’s just an indication, and not production tested, and the level of influence will vary from device to device. 30 Pa/100 bar means that the calibration may change by up to 11.4 Pa (0.114 mbar) if the static line pressure is anywhere between 2 and 40 bar.
Thermal error %FS/10K meaning
How do I interpret the thermal error specification of 0.1% FSO / 10K, it looks like the compensation range is -20…+80C?
It’s an temperature error band/tolerance, and indicates the maximum amount the measurement reading will vary from device to device for 10 kelvin increments. It is pro-rata error band, for example it will add an uncertainty of 1% over -20 to +80C, or 0.2% over a +20 to +40C process temperature range.
Long term stability explanation
What does it mean that long term stability is 0.05%FSO/year for pressure 60 mbar and above, and 0.15%FSO/year for pressure ranges below 60 mbar?
This is an indication of what to expect to happen over time with the calibrated measurement accuracy, since all pressure sensors exhibit some change in performance due to the settling in and aging of materials and components that are included in the construction of the sensor. The stability effect is very dependent on the nature of the application, and the sensor technology type, the more intense the temperature & pressure cycling the more the sensor is likely to drift away from its original calibrated accuracy.