Gefran MD SERIES Specification Sheet

MELT PRESSURE TRANSMITTERS

MD SERIES DP404 CAN OPEN digital output

The MD series of Gefran, are pressure transmitters for
using in High temperature environment.
The main characteristic of this series is the capability to
read temperature of the media up to 400°C.
The constructive principle is based on the hydraulic tra­smission of the pressure.
The fluid-filled system assures the temperature stability.
The phisical measure is transformed in a electrical mea­sure by means the strain-gauge technology.

MAIN FEATURES

Electrical

• Digital output signal with DP404 CAN OPEN communica­tion protocol

• Transmission frequency (Baud rate): 10 Kbaud to 1
Mbaud (default 500 Kbaud)

• Software selection of Baud rate and ID nodes

• Operation with 1 or 2 settable alarm limits

• “Autozero” for temperature compensation

• Zero and span drift compensation

• 80% FSO calibration signal

Mechanical

• Pressure ranges:

0-35 to 0-2000 bar / 0-500 to 0-30000 psi

• Accuracy: < ± 0.25% FSO (H); < ±0.5% FSO (M)

• Hydraulic transmission system to guarantee temperature
stability.(Hg)

• Quantity of Hg contained for model:

series MDE0 (30mm3); series MD1, MD2, MD3 (40mm3)

• Standard threading: 1/2-20 UNF, M18x1.5; other versions
on request

• Autozero function by software

• Stainless steel 15-5 PH diaphragm with GTP+ coating

• For ranges below 100 bar – 1500 psi: stainless steel

17-7PH corrugated diaphragm with GTP+ coating

GTP+ (advanced protection) Coating with high resistance

against corrosion, abrasion and high temperature

TECHNICAL SPECIFICATIONS

Rated precision, including effects of line-

arity, repeatability and hysteresis

Sampling

Pressure ranges

Maximum applicable pressure

Measurement principle

Power supply

Typical input

Insulation resistance (at 50Vdc)

Signal at rated pressure (FSO)

Signal at ambient pressure

Calibration of ambient pressure

Signal protocol

Response time (10 at 90% FSO)

Electronic response time

(10 at 90% FSO)

Calibration signal

Protection against overvoltage and reverse

polarity of power supply

Compensated temperature range of

strain gauge housing

Maximum temperature range of strain

Gauge Housing

Thermal drift in Zero

compensated range; Calibration

Sensitivity

Max. diaphragm temperature

Influence due to variation of fluid tempe-

rature (zero)

Standard material in contact

with process medium

Thermocouple (model MD2)

Protection level

Electrical connections

H < ±0.25%FSO (100…2000 bar)

M < ±0.5%FSO (35…2000 bar)

0-500 to 0-30.000 psi

Insertion of an offset

DP404 CAN OPEN, with baud rate

selectable from 10K to 1M baud

Diaphragm:

• 15-5 PH with GTP+ coating

• 17-7 PH corrugated diaphragm

with GTP+ coating for ranges

<100 bar (1500psi)

Stem:

• 17-4 PH

STD: Type * J (isolated coupling)

16 bit (1)

0-35 to 0-2000 bari

2 x FSO

Strain gauge

12…40 Vdc

20 mA (2)

>1000 MOhm

Depends on FSO

0

(default 500 Kbaud

20 ms

2 ms

80%FSO

YES

0…+85°C

32…+185°F

-30…+105°C

-22…+221°F

<0.02 %FSO/°C

<0.01 %FSO/°F

<0.01 %FSO/°F

400°C (750°F)

15 Psi/100°F

0.02bar/°C

IP65

M12 DIN EN 50044

5-pin connector

(1) resolution: 0.01bar from 35…500bar; 0.1bar from 700…2000bar;

0.1psi from 5000 …350psi; 1psi from 7500…30000psi
(2) Conditions: Power supply 24 Vdc

FSO = Full Scale Output (Signal at rated pressure)