Dynisco MDT Series User manual

1
Operating manual
MDT Series
4-20mA with Auto Zero
Pressure transmitters with integrated amplifier
for high temperatures and high pressures

2
Table of Contents
Content
General
Notes on safety
Technical data
Function
Transport/
delivery
Installation
Commissioning
Maintenance
Accessories
Troubleshooting
- Declaration of
conformity
Chapter
1
2
3
4
5
6
7
8
9
10
11
Page
3
5
7
14
16
17
25
27
30
31
32
Icon

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Operating manual
1. General
1.1 Important information 3
1.2 Copyright 3
1.3 Explanation of icons 4
1.4 Abbreviations 4
1.5 Correct use 4
1.6 User’s obligations 4
1.1 Important information
This manual applies to the MDT 420x/460x and PT 420x/
460x series, 2-wire with Auto Zero, only. It must be kept
neartheequipmentinareadilyandimmediatelyaccessible
location at all times.
The content of this manual must be read, understood and
followed in all points by all relevant people. This applies
in particular to the notes on safety. Following the safety
instructions will help to prevent accidents, defects and
malfunctions.
DYNISCO will not be held liable for any injury, loss or
damage resulting from failure to follow the instructions in
this manual.
If malfunctions occur in spite of having followed the
operating instructions, please contact the DYNISCO
customer service department (see chapter 8,
Maintenance).
This applies in particular during the warranty period.
1.2 Copyright
Copyright law requires that this manual be used for in-
house purposes only.
Allreproduction, even partially andfor in-house purposes,
requires the approval of DYNISCO. This manual may not
be forwarded to third parties.

4
1.3 Explanation of icons
The manual uses icons to indicate information
pertaining to safety:
Risk of destruction or damage to
equipment, machines or installations
General danger to life or limb
Specific danger to life or limb
You MUST do this
The safety instructions are provided again in the
individual chapters of the manual.
1.4 Abbreviations
The following abbreviations are used:
OM Operating manual
PT pressure transmitter
f.s. of full scale
1.5 Correct use
The purpose of the MDT or PT 420x/460x pressure
transmitter is to measure pressure in plastic melt as part
of a larger overall system. It contains an integrated signal
amplifier. The MDT or PT 420x/460x can be used in
media temperatures up to 400°C.
If the PT is used in other applications, the safety and
accidentprevention regulations specific to thatapplication
must be followed.
When using the PT as a safety component in
accordance with the EC Machine Directive, Annex
IIc, the equipment manufacturer must take any
necessary precautions to ensure that malfunctions
of the PT cannot cause damage or injury.
1.6 User’s obligations
The operator or owner of the larger overall system, e.g.
a machine, is responsible for following the safety and
accident prevention regulations that apply to the specific
application.

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Operating manual
2. Notes on safety
The operator or owner of the larger overall
system is responsible for following the safety
andaccident prevention regulations that apply
to the specific application.
Toxic hazard!
The PT contains a small amount (7 mm³) of
mercury (Hg) as its transmission medium. If
the diaphragm is damaged, mercury may
escape.
Never transport or store the PT without the
protective shell bolted in place. Remove the
shell shortly before installation.
If mercury is inhaled or swallowed, seek
medical attention immediately!
Mercury is hazardous waste and must be
disposed of in accordance with applicable
laws. DYNISCO will accept defective PTs.
If mercury escapes, use airtight packaging!
When planning machinery and using the PT,
follow the safety and accident prevention
regulations that apply to your application,
e.g.:
●EN 60204, Electrical equipment in
machines.
●EN 292, Machine safety, general design
guidelines.
●DIN 57 100 Part 410, Protection against
electric shock.
Mounting and electrical connection of the PT
mustbe done by specialists withEMC training,
following all applicable regulations, and in
pressureless, voltage-free condition with
the machine switched off.
The machine must be secured against
being switched back on!
Burn hazard!
The PT must be removed with the melt in
molten condition. The PT can be very hot
when removed.
Wear protective gloves!

6
3. Technical Data
3.1 Ordering guide 6
3.2 Ordering example 6
3.3 Performance characteristics 7
3.3.1 Accuracy 7
3.3.2 Repeatability 7
3.3.3 Resolution 7
3.4 Mechanical configurations 7
3.5 Pressure side connection 7
3.6 Pressure ranges 7
3.6.1 Pressure ranges in bar 7
3.6.2 Max. Overload 8
3.6.3 Burst pressure 8
3.6.4 Limit frequency 8
3.7 Rigid stem/flexible stem 8
3.8 Electrical Data 8
3.9 Temperature influence 9
3.10 EMC requirements 9
3.11 Materials 9
3.12 Mounting torque 9
3.13 Environmental Protection 9
3.14 Weight 9
3.15 Dimensions 10
3.1 Ordering guide
xDT4xx x- xx - xxx - x - Option
Rigid stem/flexible stem
Pressure range
Pressure side connection
Amplifier
Perf. characteristics
Mechanical configuration
The exact meanings of the letter/digit combinations
are given in the corresponding sections of chapter 3.
3.2 Ordering example
MDT462 F - ½ - 5C - 15/46
Melt PT
Perf. char. ± 1,0 % full scale
Amplifier: 2-wire 4-20mA
Thread: ½ = ½" - 20 UNF
Pressure range: 0 - 500 bar
Stem length:15 = 152 mm
Flex. stem:46 = 457 mm

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Operating manual
3.3 Performance characteristics (xDT4Xx x-xx-xxx-xx)
3.3.1 Accuracy
(Linearity and hysteresis at T = constant)
xDT42x x ± 0,5 % of full scale
(35 bar and 50 bar ± 1 % of full scale)
xDT46x x ± 1 % of full scale
3.3.2 Repeatability
xDT42x x ± 0,1 % of full scale
(35 bar and 50 bar ± 0,2 % of full scale)
xDT46x x ± 0,2 % of full scale
3.3.3 Resolution infinite
3.4 Mechanical configurations (XDT4xX x-xx-xxx-xx)
MDT4x0stem version
MDT4x2rigid stem and flexible stem
TDT432/463 combined pressure and
temperature measurement
MDT435/467 transducer for limited
installation space
3.5 Pressure side connection (xDT4xx x-XX-xxx-xx)
½ =½" 20 UNF 2A
M18 = M18 x 1,5
3.6 Pressure ranges (xDT4xx x-xx-XXX-xx)
3.6.1 Pressure ranges in bar
Model number Permitted pressure range
in bar
xDT4xx x-xx-17-xx 0 - 17
series 42x x/43x x only
xDT4xx x-xx-35-xx 0 - 35 series 42x x/43x x only
xDT4xx x-xx-50-xx 0 - 50 series 42x x/43x x only
xDT4xx x-xx-1C-xx 0 - 100
xDT4xx x-xx-2C-xx 0 - 200
xDT4xx x-xx-3,5C-xx 0 - 350
xDT4xx x-xx-5C-xx 0 - 500
xDT4xx x-xx-7C-xx 0 - 700
xDT4xx x-xx-1M-xx 0 - 1000
xDT4xx x-xx-1,4M-xx 0 - 1400
xDT4xx x-xx-2M-xx 0 - 2000
Other pressure ranges on request

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3.6.2 Max. Overload (without influencing operating
data)
2 x full scale pressure up to 700 bar
(for 1000 bar and 1400 bar range: max. 1750 bar,
and 2450 bar for the 2000 bar range)
3.6.3 Burst pressure 6 x nominal value,
max. 3000 bar
3.6.4 Limit frequency 50 Hz [-3db]
3.7 Rigid stem/flexible stem (xDT4xx x-xx-xxx-XX)
15 = 152 mm standard length for rigid version
15/46 = 152 mm stem length / 457 mm flexible stem
Other lengths on request
3.8 Electrical data (xDT4xx X-xx-xxx-xx)
Configuration 4-arm Wheatstone bridge
strain gauge with int. amplifier
Output signal
xDT4xx F-xx-xxx-xx 2-wire 4 - 20 mA
Strain resistance
2 - wire mA RL< 1200 Ωat US= 36 V
RL< 50 Ωat US= 14 V
Supply voltage / power consumption
2 - wire mA 14 - 36 VDC
Calibration function 80 % ± 0,5 % of full scale
(room temperature) output by externally con-
necting contacts E and F
Zero balance Use button or externally
connected contacts D + F to
zero-balance the unit
Leakage resistance > 1000 MΩat 50 V
3.9 Temperature influence
Electronics housing
Max. housing temperature -25 °C - +85 °C
Compensated temp. range 0 °C - +70 °C

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Operating manual
Zero shift due to temperature change on electronics
housing
xDT 420 x series ±0,2% full scale / 10 °C typ.
xDT 460 x series ±0,2% full scale / 10 °C typ.
Sensitivity shift due to temperature change on
electronics housing
xDT 420 x series ±0,2% full scale / 10 °C typ.
xDT 460 x series ±0,2% full scale / 10 °C typ.
Diaphragm (in contact with media)
Maximum temperature
at the diaphragm 400 °C
Zero shift due to temperature change on the
diaphragm
xDT 420 x series <0,2 bar / 10 °C typ.
xDT 460 x series < 0,4 bar / 10 °C typ.
Sensitivity shift due to temperature change on the
diaphragm
xDT 420 x series < 0,1 % f. s. / 10 °C typ.
(35 and 50 bar < 0,2 % f. s. / 10 °C typ.)
xDT 460 x series < 0,4 % f. s. / 10 °C typ.
3.10 EMC requirements
Conforming to in accordance with EMC directive.
Emitted interference DIN EN 50081-1
(residential area)
Immunity DIN EN 50082-2
(industrial area)
3.11 Materials
Diaphragm 15-5PH Mat.No. 1.4545
Armoloy coated
Stem 15-5PH Mat.No. 1.4545
3.12 Mounting torque
max. 50 Nm (500 inch-lbs.)
min. 12 Nm (100 inch-lbs.)
3.13 Environmental protection to IEC 529
PT housing IP54 (without connector)
Standard connector
PT06A-10-6S(SR) IP40
Connector PT06W-10-6S IP64
3.14 Weight 1,1 kg

10
Fig. 01: MDT 420 x/460 x
with fixed stem
96
3.15 Dimensions

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Operating manual
D1 D2 D3 D4 D5 A B C SW
1/2"-20UNF-2A 7,8
-0,05
10,5
-0,05
11
-0,5
12,5 5,3
+0,25
11 16 16
M18 x 1,5 10
-0,05
16
-0,1
16
-0,5
18 6
-0,25
14 20 19
flexible
96 Fig. 02: MDT 422 x/462 x
with flexible stem

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Union nut
96
flexible
Fig. 03: MDT 435 x/467 x with capillary

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Operating manual
D1 D2 D3 D4 D5 A B C SW
1/2"-20UNF-2A 7,8
-0,05
10,5
-0,05
11
-0,5
12,5 5,3
+0,25
11 16 16
M18 x 1,5 10
-0,05
16
-0,1
16
-0,5
18 6
-0,25
14 20 19
flexible
length 76
flexible
length 457
96
Thermocouple type J
Connector + Plug connector
Fig. 04: TDT 432 x/463 x with thermocouple

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4. Function
4.1 Construction 14
4.2 Description of functions 14
4.3 PT series 15
4.1 Construction
The PTs of series MDT 420 x/460 x are industry
standard.
The main advantages are:
- manufactured under ISO 9001
- thermal stability
- resistance to aggressive media
- insensitivity to electromagnetic radiation (EMC)
- liquid-filled transmission system (mercury)
- pressure measurements in plastic melt up to a
temperature of 400°C (750°F)
- maximum pressure 2000 bar
4.2 Description of functions
Through a closed, liquid-filled pressure transmission
system, the PT furnishes an electrical signal that is
proportional to the pressure of the melt.
The pressure applied by the medium is forwarded to the
measuring diaphragm via the separating diaphragm and
the mercury in the capillary. The deflection of the
measuring diaphragm changes the resistance of the
strain gauge bonded to the measuring diaphragm. The
strain gauge is a Wheatstone bridge.
The integrated amplifier generates an electric mA signal
in proportion to the applied pressure.

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Operating manual
Fig. 05: Functioning principle of the PT of the
MDT 420 x/460 x series
4.3 PT series
The MDT series PTs are also available as PT series. The
PT types correspond to the MDT models, and the TPT
types correspond to the TDT models; the number codes
are identical. The PT series differs from the MDT series
in that all specifications are given in US American units of
measure.
E.g.: 1 bar = 14,5 PSI
(PSI value is rounded)
2,54 cm= 1" (inch)
All other specifications are the same as in the MDT
series.
Separating diaphragm
0.15 mm thick
Total
filling volume = 7 mm³
Capillary with pressure
transmission fluid (Hg)
Strain gauge on the
measuring diaphragm
Filling opening

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5. Transport / delivery
5.1 Transport / packing /
transport damage 16
5.2 Storage 16
5.3 Scope of delivery 16
Toxic hazard!
The PT contains a small amount (7 mm³) of
mercury (Hg) as its transmission medium. If
the diaphragm is damaged, mercury may
escape.
Never transport or store the PT without the
protective shell bolted in place. Remove the
shell shortly before installation.
If mercury is inhaled or swallowed, seek
medical attention immediately.
Mercury is hazardous waste and must be
disposed of in accordance with applicable
laws. DYNISCO will accept defective PTs.
If mercury escapes, use airtight packaging!
ESD sensitive component. Electrostatic
discharge may damage the PT. Take ESD
precautions.
5.1 Transport/packing/transport damage
- Do not let the PT be damaged by other items
during transit.
- Use only the original packaging.
- Report transport damage to DYNISCO
immediately in writing.
5.2 Storage
- Store the PT in original packaging only.
- Protect against dust and moisture.
5.3 Scope of delivery
- PT with diaphragm protection cap
- Cable socket
- Fastening clip (transmitter with flexible stem only)
- Calibration sheet
- Operating manual

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Operating manual
d 4
d 1
d2
d3
R
Z 16
6. Installation
6.1 Mounting hole 17
6.2 Checking the mounting hole 18
6.3 Mounting the Pressure Transmitter 19
6.4 Mounting PTs with flexible stem 20
6.5 Electrical connection 21
6.5.1 EMC / compliant connection 21
6.6 Connection assignments 22
6.7 Wiring 23
6.8 Connection thermocouple /
RTD element 24
Am bient temperature for the electronics
housing max. +85°C. Higher temperatures
canresult in damage andmalfunctions. Mount
the PT only in locations where these
temperatures are not exceeded.
6.1 Mounting hole
To produce the mounting hole, use only
DYNISCO machining tool kit.
- Drill the mounting hole as shown in figure 06.
Fig. 06: Mounting hole for transmitter
MDT 420 x, 460 x, 422 x, 462 x, 432 x, 463 x
00014
Thread complete
d1d2d3d4abc
1/2"-20UNF-2B 7,92+0,05 11,5+0,1 13 5,7 4 19
M18 x 1,5 10,1+0,05 16,3+0,1 20 6,15 4 25
a
b
c

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Fig. 07: Mounting hole for transmitter MDT467 x
When reworking the mounting hole, pay particular
attention to the centricity of:
- the hole,
- the thread and
- the sealing surface.
Pressure sealing takes place on the 45° beveled
sealing surface and on the front cylindrical section of
the PT (see figures 06 and 07).
The sealing surface must be:
- correctly machined
- free from marks and rough edges
- free from solidified plastic residue.
6.2 Checking the mounting hole
- Paint the test bolt DYNISCO on the marked area
(figure 08, item 1) with marking ink up to the
thread.
Fig. 08: test bolt with marking ink
- Insert the test bolt in the mounting hole
- Twist it in by hand until the two sealing surfaces
make contact.
- Remove and examine the test bolt.
The only acceptable abrasion of marking ink is at the
sealing edge (45°), evenly (!) over the entire
circumference.
If the ink has been rubbed off in other places too:
- rework the mounting hole.
00011
d1d2d3
1/2"-20UNF-2B 7,92+0,05 11,5+0,2
abc
3 1,5 17

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Operating manual
6.3 Mounting the Pressure Transmitter
Mounting and electrical connection of the PT
mustbe done by specialists withEMC training,
following all applicable regulations, and in
pressureless, voltage-free condition with
the machine switched off.
The machine must be secured against
being switched back on!
Toxic hazard!
The PT contains a small amount (7 mm³)
of mercury (Hg) as its transmission
medium. If the diaphragm is damaged,
mercury may escape.
Never transport or store the PT without the
protective shell bolted in place. Remove the
shell shortly before installation.
If mercury is inhaled or swallowed, seek
medical attention immediately!
ESD sensitive component. Electrostatic
discharge may damage the PT.
Take ESD precautions.
Before mounting the PT, check the mounting
hole carefully. The PT must only be mounted
in holes that satisfy the requirements
stipulated in chapter 6.1. A hole that does not
satisfy these requirements can damage the
PT.
Before mounting the PT, ensure that the
mounting hole is free from plastic residue.
Remove plastic residue with the DYNISCO
cleaningtool kit. Atest bolt is includedwith this
cleaning set.
To prevent the PT from sticking permanently
in the mounting hole, coat the thread section
of the transmitter with high temperature
resistant grease or a suitable parting agent.
- Check the mounting hole with the test bolt, and clean
with cleaning set if necessary.
- Coat the thread section of the transmitter with high
temperature resistant grease or a suitable parting
agent.
Always use a spanner applied to the
designated hexagon collar when screwing
the PT in and out. Do not apply the tool to the
housing or housing/sensor connection!