DatasheetDynisco MDT435F / MDT467F Melt Pressure Transmitters
The Dynisco MDT435F / MDT467F Series includes new 2-wire melt pressure transmitters with 4…20 mA output signal for use in critical environments with high interference potential. The devices are designed so that the current signal can be transmitted reliably over long distances, even when unshielded connection cables are used.
A key feature of the series is the “Auto-Zero” function. Zero adjustment can be initiated directly in the field via a push button on the transducer or remotely from the control room or central control system. The applied process pressure is converted by the integrated 2-wire amplifier into a proportional 4…20 mA output signal.
The MDT435F and MDT467F models feature a special short sensing head with 1/2″-20 UNF thread and a flexible, partly free capillary to the amplifier housing. This makes them especially suitable for applications with limited installation space. The series also includes integrated electronic range calibration and defined fault signal behavior according to NAMUR NE 43.
| Type | 2-wire melt pressure transmitter with 4…20 mA output |
|---|---|
| Series | Dynisco MDT435F / MDT467F Series |
| Models | MDT435F and MDT467F |
| Application | Melt pressure measurement in critical environments with high interference and restricted installation space |
| Output signal | 2-wire 4…20 mA |
| Pressure range | 0…35 bar to 0…2000 bar |
| Accuracy MDT435F | ±0.5 % F.S.; up to 50 bar ±1 % F.S. |
| Accuracy MDT467F | ±1 % F.S. |
| Repeatability MDT435F | ±0.1 % F.S.; up to 50 bar ±0.2 % F.S. |
| Repeatability MDT467F | ±0.2 % F.S. |
| Resolution | Infinite |
| Measuring system | 4-arm strain gauge |
| Supply voltage | 12…36 VDC |
| Internal calibration point | 80 % of full scale ±1 % |
| Range calibration | By calibration value 80 % F.S. |
| Zero adjustment | Via “Auto-Zero” adjustment function |
| Auto-Zero zero adjustment | Locally by push button on the transducer or remotely from control room / central control system by shorting the “CAL-” and “GND” terminals |
| Load resistance | 1200 Ω at 36 VDC; 500 Ω at 24 VDC |
| Insulation resistance | 1000 MΩ at 50 VDC |
| Signal output in fault condition | Failure signal level according to NAMUR NE 43: ≤3.6 mA or ≥21 mA |
| Maximum overload | 2 × pressure range; for 1000 and 1400 bar range max. 1750 bar; for 2000 bar range max. 2450 bar |
| Burst pressure | 6 × pressure range, max. 3000 bar |
| Material in contact with media | 15-5 PH SST, material no. 1.4545, DyMax™ coated |
| Max. diaphragm temperature | 400 °C |
| Diaphragm zero shift due to temperature change | MDT435F < 0.2 bar / 10 °C; MDT467F < 0.4 bar / 10 °C |
| Max. housing temperature | 85 °C |
| Housing zero shift due to temperature change | ±0.2 % F.S. / 10 °C |
| Sensitivity shift due to temperature change | MDT435F ±0.1 % F.S. / 10 °C; up to 50 bar ±0.2 % F.S. / 10 °C; MDT467F ±0.3 % F.S. / 10 °C |
| Sensing head | Short pressure sensing head for restricted installation spaces |
| Process connection | 1/2″-20 UNF thread |
| Connection | Flexible, partly free capillary to the amplifier housing |
| Key features | 2-wire technology, Auto-Zero function, high noise immunity, unshielded connection possible, integrated electronic calibration, NAMUR NE 43 fault signal |
