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New Generation
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2-wire Melt Pressure Transmitter
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with excellent Noise Suppression and
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“Auto-Zero” Push-Button-Function
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Series MDT4X2F
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Description
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The new
Pressure Transmitter Series MDT provides special features for critical field
applications in
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high noise surroundings.
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The utilization
of unshielded cables is also possible for long distance transmission free of
noise
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interference for the converted process pressure signal 4-20 mA.
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Features
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 Simple and cheap
unshielded two-wire cable connection in high noise ambients
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Efficient
“Auto-Zero” adjustment either through pushbutton on the
transmitter or in the control room
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4-20 mA two-wire Signal Output
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Electrical built-in
calibration
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Installation for media
temperatures up to 400๐C
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Flexible capillary connection
between stem with diaphragm and housing
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Failure detection
through “fail-safe” signal levels acc. to NAMUR recommandation
NE43
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Technical Data
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Pressure
range
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0-17 bar
to 0-2000 bar
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Accuracy
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MDT422F +/-0.5%FSO
– up to 50 bar +/-1%FSO
MDT462F +/-1%FSO
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Repeatablility
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MDT422F
+/-0.1%FSO
–
up to 50 bar +/-0.2%FSO
MDT462F +/-0.2%FSO
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Resolution
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infinite
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Maximum
overload (without influencing operation data)
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2 x
pressure range for range 1000 and 1400
bar max. 1750 bar and max. 2400 bar for range 2000 bar
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Burst pressure
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6 x pressure range max. 3000 bar
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Material
in contact with Media
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15-5 PH
SST (Mat. No. 1.4545) DyMAXTM coated
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Electrical Characteristics
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Configuration
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4-arm. Wheatstone
bridge strain gauge (DMS)
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Internal Shunt-Calibration
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80% of full scale +/-1%
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Output
signal
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2-wire
4-20 mA
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Supply voltage
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12-36 V DC
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Zero
balance
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Through
“Auto-Zero” adjustment function
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“Auto-Zero” initiation
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In the field on the transmitter,
“Zero-push-button”, or externally via
“short circuit” between contacts “NP”
and “GND”
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Range
Calibration 80% FSO
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“Short
circuit” between connection pins “CAL” and
“GND” at the transmitter or externally from the control room
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Load resistance
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Maximum 1200Ω at 36 V DC
Maximum 500Ω at 24 V DC
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Isolation
resistance
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1000 MΩ
at 50 V DC
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“Fail-Safe” signal levels
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Signal levels acc. to NAMUR
recommendation
NE43: <=3,6 mA or >= 21,5 mA
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Temperature Influence
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Diaphragm
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Max.
Temperature
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400๐C
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Zero
shift due to temperature change
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MDT422F
< 0.2 bar/10๐C
MDT462F < 0.4 bar/10๐C
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Housing
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Max.
Temperature
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85๐C
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Zero shift due to temperature change
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+/-0.2% FSO/10๐C
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Sensitivity
shift due to temperature change
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MDT422F
+/-0.1% FSO/10๐C
-up to
50 bar +/-0.2% FSO/10๐C
MDT462F +/-0.3% FSO/10๐C
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