DP transmitter for measuring pressure difference between two pressure points which can tolerate up a very high overload pressure independently on either the positive or negative side port or both together at the same time.
Product Description
The DPT200 dp cell transmitter is a robust heavy duty pressure measurement instrument with a high and low pressure connection port to allow two pressure inputs. The DPT200 will measure the pressure difference between the Hi & Lo side and will output the result as a 2 wire 4 to 20 milliamp current loop signal.
Product Features
High line pressure protection on high or low side only
Prevent unnecessary failures from accidental disconnection of process fittings or closing off isolation valves on one side of the dp level transmitter. The DPT200 has as standard built-in overload protection from unexpected high pressures on each port, whether applied to one side or both together.
Customise material for wetted components exposed to media
Ensure compatibility with corrosive liquids by selecting the flange, diaphragm and seal material to be used when this dp transmitter is made. Choose from stainless steel 304 or 316L for the flange, stainless steel 316L or Hastelloy C276 for the diaphragm, and FKM, EPDM, NBR or PTFE for the seals.
Product Help
Measure filter dp to 20mbar & withstand 1bar cleaning pulse
I am looking to measure a differential pressure across a filter element. Air is being drawn through the filter via an extraction fan so that downstream of the filter the pressure is -1000Pa. As the filter becomes coated with dust the differential pressure across it will rise from 5mbar to 10mbar, at this point we wish to send a signal to a control panel. The control panel will send a pulse of gas up to 1 bar to clean the element and the procedure will begin again. A 20mbar dp with a 1 bar overpressure rating would be ideal.
The DPT200 has very good overpressure rating on either port and it is possible to scale the output to read over 0-20 mbar. The accuracy will be 0.1% of 20 mbar = 0.03 mbar. You can use a positive differential range to measure a suction range by connecting the positive port to the upstream side of the filter and the negative port to the downstream side of the filter.
- SKU ID: s1-dpt200-0004
- Part No: 343-C-1-H-17-L-AL-AK0-N20-0-N20-0-12-11-1-000
- Pressure Datum: Differential Pressure
- Differential Pressure Range: 0 ‐ 4 mbar up to 0 ‐ 400 mbar
- Factory Set Range: 0 to 20 mbar
- Maximum Static Pressure: 160 bar
- Display: With backlit display
- Output: 4-20mA/ 2-wire with HART
- Accuracy: <±0.075% / FSO IEC 60770
- Electrical Connection: Terminal clamp / M20 x 1.5 Cable Gland
- Housing Material: Aluminium
- Process Connection: Internal thread 1/4″‐18 NPT
- Process Connection Material: Stainless Steel 1.4401 (316)
- Diaphragm Material: Stainless Steel 1.4435 (316L)
- Seal Material: FKM
- Special Options: None
- Supply Voltage: 12 ‐ 42 V dc
- IP Rating: 67
- Media Temperature: -40 to +100°C
- Operating Temperature: -20 to +65°C
- Approvals: None
1/2NPTF with adapter and 1/4-18 NPTF/fixing 7/16 UNF meaning
For the process connection code the N57 – 1/2″ NPT F with adapter and also the N20 – 1/4″-18 NPT F/ fixing 7/16 UNF. What does this mean?
For the code N20, this refers to a base process connection of 1/4″-NPT internal thread, and then the fixing holes used to mount the sensor, which in this case are 7/16″ UNF internal thread.
For the code N57, this refers to 1/2″ NPT F thread oval shaped adapter for the high and low side process connections, which is screwed onto the standard 1/4 NPT internal thread flange assembly using the fixing holes and elastomer seals.
Fixing holes thread size with oval adapters
What is the fixing hole thread for the 1/2″ NPT F with adapter process connector option? It is not mentioned on the data sheet, but the other process connection options specify the fixing hole thread.
The 4 fixing holes on each side of the DP sensor used for mounting brackets, valve blocks and oval adapters are 7/16” UNF with the 1/2 NPT oval adapter opton, but these will not be available since they are used to fit the oval adapters to the dp sensor.
Top vs Bottom side valves
For the valve on the H-side and L-side, what does having a vent on the top and the bottom mean, and also does having a vent mean we would be able to bleed the system with air it has the “with vent” option?
The top side means the valve is fitted to upper most fitting on the process connection flange assembly which is ideally located for bleeding off trapped air.
The bottom side means the valve is fitted to the low most fitting on the process connection flange assembly which is ideally located for draining fluid.
Accuracy of -10 to +10 mbar range
For the DPT 200 Type A version with setting measurement span of -10 to +10mbar, is the accuracy 0.075% of 20mbar i.e. 1.5Pa?
Yes the accuracy is 0.075% of FSO full scale output. -10 to +10 mbar reflects the operating range of the 4-20mA output signal, therefore the negative and positive ranges are combined together to determine the full scale, which in this case is 20 mbar.
H-side & L-side valves
What does “Valve H-side” and “Value L-side” mean?
There valves are optional accessories to allow the user to vent air, or drain process fluids on both process connections of this differential pressure transmitter. H-side means the high or positive pressure port, and L-side means the low or negative pressure port.
Over-pressure limit
What is the over-pressure limit on the Hi & Lo pressure side?
This differential pressure transmitter is designed to withstand the maximum line pressure on one side only, irrespective of whether it is applied to the Hi or Lo pressure side process connections.