Microsensor MDM7000 User manual

MDM7000
Operation Manual
V1.1

I
Contents
1 Introduction ............................................................................................ 1
2 Precautions for use ................................................................................2
3 Specifications .........................................................................................4
4 Outline construction and installation ..................................................... 5
5 Electrical connection ........................................................................... 10
6 Menu operation ....................................................................................14
7 HART function ..................................................................................... 18
8 Operation, maintenance and fault diagnosis ...................................... 19
9 Unpacking, components and storage ................................................. 24
10 Responsibility .................................................................................... 25
11 Naming...............................................................................................26
The company reserves the right to revise this operation manual due
to product technology and process advancements. Any modifications
will be made without prior notice.
Refer to the latest version of this manual.
Micro Sensor also reserves the final interpretation right of this
manual.
See the cover for version number.

1
Thanks for your using products from MICROSENSOR. To make the
most of this product, it is recommended that you carefully read this
manual before using it.
1 Introduction
1.1 Introduction
MDM7000 series smart differential pressure transmitters adopt
cutting-edge sensor technology for superior performance. They are
used to measure the level, density, pressure and flow of liquid, gas or
steam, convert the pressure signal into 4mA ～20mA DC analog
current signal output, and realize remote setting, monitoring and other
functions through communication equipment. They are applicable to
the demanding process chemical industry.
1.2 Quality assurance
a) The warranty period is specified in the quotation or specifically
stated in the contract by both parties. If a fault occurs during the
warranty period that is not due to user error, repairs will be free
of charge in principle.
b) After a fault occurs, the user can contact the distributor or Micro
Sensor. Please provide relevant information such as instrument
model and specifications, product nameplate information
(including ID), order information, fault description, and
environmental conditions so that the failure can be resolved
quickly and effectively.
c) For faults caused by the following reasons, the user shall bear
the repair costs even within the warranty period:
The instrument installation site does not meet the
environmental conditions described in Chapter 4, Section 4.1
of this manual.

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Incorrect installation, incorrect operation, or incorrect repairs
by unauthorized body.
The on-site pressure exceeds the maximum operating
pressure of the instrument.
Damages caused by irresistible incidents, such as
earthquake, fire, war, etc.
2 Precautions for use
a) The pressure transmitter should be installed, debugged, and
maintained by professional engineers or technical personnel.
Before installation, carefully read this manual, understand, and
adhere to its various regulations.
b) The pressure transmitter is powered by an external power
supply, and the power supply circuit should comply with the
energy-limiting circuit specified by relevant standards, while also
being mindful of the potential presence of high voltage in the
circuit.
c) When using the pressure transmitter in hazardous environments,
installation, operation, and maintenance should adhere to the
relevant regulations in this manual and national standards.
d) Disassembly of the instrument is only permitted under
atmospheric pressure.
The manual employs several symbols to provide specific
information, which are explained as follows:
Warning
Indicates danger, which may result in serious personal accidents or
significant property damage.

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Caution
Indicates general faults that may result in minor personal injury or
some property damage.
Prompt
Important information about the product, or a certain part of the
manual needs prompting.
Disclaimer
We have conducted checks to ensure the consistency between the
content in the printed materials and the hardware and software.
However, the possibility of discrepancies cannot be ruled out,
therefore, we do not guarantee full consistency between the
content in the printed materials and the hardware and software.
The data in the printed materials has been verified according to
regulations, and necessary calibration will be included in the next
version.

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3 Specifications
3.1 Transmitter nameplate：
*Note 1: The nameplate certification is primarily based on the selection
results, and the nameplate specifications are for illustrative purposes
only.
*Note 2: When it is a differential pressure transmitter, the maximum
operating pressure becomes the maximum static pressure: 420bar.
Figure 1 Nameplate

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3.2 Main specifications：
Power supply Rated voltage
Output signal 4mA～20mA+HART
Accuracy class 0.05%/0.075%/0.1%
Long-term stability ±0.1% Span/5 Years
ATEX Explosion-proof mark
(Intrinsically safe) II 1G Ex ia IIC T4 Ga
IECEX Explosion-proof mark
(Intrinsically safe) Ex ia IIC T4 Ga
ATEX explosion-proof mark
(Flameproof)
IECEX explosion-proo
II 2G Ex db IIC T6 Gb
f mark
(Flameproof) Ex db IIC T6 Gb
Model Range
0.06bar 0.4bar 2.5bar 10bar 30bar 100bar 400bar
DP √ √ √ √ √ × ×
GP × √ √ √ √ √ √
AP × √ √ √ × √ ×
4 Outline construction and installation
4.1 Installation conditions
4.1.1 Natural conditions
Ambient
temperature -40℃～+85℃Medium temperature -40℃～+105℃
Storage
temperature -40℃～+100℃Atmospheric pressure
0.86bar～
1.06bar
Ambient
humidity
5%RH～
100%RH@40℃
Ambient
temperature for -40℃～+70℃

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Explosion-proof
type
Ambient temperature with LCD
display
-20℃～+70℃
Ambient temperature with LCD
display for Explosion-proof type
-20℃～+70℃
Storage temperature with LCD
display
-40℃～+85℃
*The ambient temperature for explosion-proof/intrinsically safe
transmitters should adhere to the group specified in the local area
certification certificate.
Temperature class
Maximum surface
temperature of the
equipment [℃]
Ignition temperature of
flammable substances
[℃]
T4
135
200≥T＞135
T5
100
135≥T＞100
T6
85
100≥T＞85
4.1.2 Electromagnetic conditions
Radiated interference: ≤1000MHz
Radio-frequency interference: ≤10V/m (80MHz～1GHz)
Electrostatic interference: ≤8kV
Power frequency interference: ≤30A/m
4.1.3 Mechanical conditions
Vibration acceleration: ≤3g
4.1.4 Installation position
a) Please endeavor to minimize variations in temperature or the
existence of apparent thermal gradients. If the equipment in this
location is exposed to heat radiation, take insulation and
ventilation measures.

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b) Avoid installing the transmitter in corrosive conditions. If
unavoidable, ventilation measures must be taken, and
precautions should be in place to prevent rainwater from
penetrating the cable.
c) Although the transmitter is designed with shock and vibration
resistance, caution should still be taken to avoid mechanical
disturbances that could cause damage to the pressure
transmitter.
4.2 Installation
The transmitter housing can be rotated approximately 300° relative to
the sensor (see outline construction and overall dimensions), allowing
it to be fixed in any position without affecting performance and internal
wiring. When rotating the housing, it is imperative not to forcibly
rotate the sensor part. Instead, use a 2mm hex wrench to loosen the
fixing screws by approximately one turn (taking care not to fully
unscrew them, as indicated in outline construction and overall
dimensions). Once the installation position is confirmed, tighten the
screws again. This method minimizes the impact on electronic circuit
connections and output displays. Installation as shown in the following:
4.2.1 Outline Construction and overall dimensions
Unit: mm
Warning
It is recommended to avoid installing in areas with large
temperature differentials, prone to condensation, susceptible to icing, and
high levels of vibration.

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DP
MDM7000 Transmitter With Display
MDM7000 Transmitter Without Display
Figure 2
Figure 3
MDM7000 Transmitter With D1 Adapter
MDM7000 Transmitter With D2 Adapter
Figure 4
Figure 5
Fixed screw
Fixed screw
Port: butt welding
Port: butt welding

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AP/GP
MDM7000 Transmitter With Display
MDM7000 Transmitter Without Display
Figure 7
Process Connection (M)
Process Connection (G)
Process Connection (A)
Process Connection (N)
Figure 8
Figure 9
Figure 6
Fixed screw
Fixed screw

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5 Electrical connection
5.1 Electrical connection
TEST LOOP
During electrical installation, relevant guidelines must be followed. As
the transmitter does not come with a power switch, overcurrent
protection or power cut-off devices must be configured.
Verify that the operating voltage aligns with the specifications indicated
on the nameplate. Electrical connection can be made via the NPT1/2
or M20×1.5 cable entry to the connection terminal.
Figure 10
Figure 11
Figure 12

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Explosion-proof type and mark
Explosion-proof type: Intrinsically safe, Flameproof
Explosion-proof mark: II 1G Ex ia IIC T4 Ga/ Ex ia IIC T4 Ga
II 2G Ex db IIC T6/T4 Gb/Ex db IIC T6/T4 G
IP Rating: IP67
Intrinsically safe specifications: Ui: 30V, Ii: 100mA, Pi: 0.7W, Ci:
0μF; Li: 14.52μH
5.1.1 2-wire electrical connection
Precautions:
a) Keep the circuit connections as short as possible;
b) Select shielded twisted-pair signal cables for optimal grounding.
To avoid ground loop, the shield layer should be single-ended
grounded, with the pressure transmitter side being insulated and
Warning
Flameproof transmitter must be disconnected from power
before wiring. After wiring, tighten the back cover and rotate
the connector to compress the cable, ensuring dust and water
resistance as well as cable fixation.
Figure 13 Electrical connection between transmitter and external power supply

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floating, and the control cabinet side being grounded
c) Devices equipped with surge protectors must be grounded to
ensure proper function. The most effective way to ground the
transmitter housing is to directly connect the protective ground
terminal to an impedance ≤5Ω to the ground.
d) Try to avoid direct proximity to user devices or wiring of electrical
and electronic devices that may cause interference.
e) The cable entry thread hole on the housing is M20×1.5, and the
matching cable entry device shall be used；
f)Flameproof transmitter must be disconnected from power before
wiring. After wiring, tighten the back cover and rotate the
connector to compress the cable, ensuring dust and water
resistance as well as cable fixation；
g) Avoid nearby high-power electrical equipment and utilize
shielded cables (the shielding layer is well grounded at both
ends).
Warning
For flameproof transmitters, under powered conditions, it is strictly
prohibited to open the rear cover or front glass. Therefore, during
on-site use, hand terminal should not be used to calibrate the
transmitter, but the transmitter buttons can be used for calibration.
5.1.2 2-wire HART communication connection

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Figure 14
The communication mode of the transmitter is HART, and a brief
description of the communication connection of the HART transmitter
is as follows.
The output of HART transmitter modulates HART digital signal besides
the 4mA～20mA signal. In the electrical connection diagram between
the transmitter and the external power supply shown in Figure 14, the
HART terminal device can be connected across the "+" and "-"
terminals of the transmitter or across the two terminals of the load
resistor. The transmitter can be used in conjunction with all
HART-compatible instruments in the system, such as actuators and
valve positioners. HART terminal devices can be used to individually
operate and control these instruments.
5.2 Power supply
It is recommended to use a dedicated linear DC power supply to
power the pressure transmitter. The resistance load will cause a
voltage drop, therefore it is necessary to calculate the total
resistance of the signal cable, display head, and any other recording
and display devices to ensure that it meets the requirements for the
terminal voltage.
250Ω
Series resistor
Power
supply

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For current signal output with HART: 16.5V～55V DC.
For Intrinsically safe current signal output: 18.5V～28V DC.
6 Menu operation
6.1 Button definition
For the local buttons "S," "Z," and "M," there are three forms of button
definitions as follows:
6.1.1 “Enter/Confirm”
Press button "M," hold for 0.1s, then release; each execution of this
operation inputs an "Enter/Confirm" function.
6.1.2 “Set/Switch”
Press button "Z," hold for 0.1s, then release; each execution of this
operation inputs an "Set/Switch" function.
6.1.3“Change”
Press button "S" or "Z," hold for 0.1s, then release; each execution of
this operation inputs an "Change" function.
Prompt
The instrument may be locked during the first adjustment. You can
unlock it by pressing and holding the [M] button for more than 3
seconds, and then proceed with the instrument adjustment. Once the
specification changes are completed, you can press the [M] button
several times to return to normal display mode and confirm the
specifications. Alternatively, you can wait for 20 seconds for the
instrument to automatically return to normal display mode, confirming
the specifications. If you fail to switch by pressing the [M] button or if
the instrument does not automatically return to normal display mode

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after specification changes (such as immediately powering off and
restarting without returning to the normal display mode after
completing the operation settings), the changed specifications may
not be confirmed.
6.2 LCD display window
The transmitter has an LCD screen for variable display and setting
operations. The Primary variable setting mode is shown in Figure 15.
6.3 Button operation
As an example, the factory-set specifications for the
pressure/differential pressure transmitter are as follows: measuring
range of -10kPa～100kPa, operating in atmospheric conditions. The
quick operation diagram is shown below:
Figure 15 Contents of primary variable setting mode

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17

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7 HART function
The HART communication function of the transmitter is realized
through HART related equipment, such as HART handheld terminal,
supervisory control and data acquisition (SCADA) system with
upper-level software, etc.
7.1 HART basic functions
The basic functions of HART are the same as the “Menu operation”
function in Chapter 6. The following functions will not be described in
detail in this chapter. Please refer to “Menu operation” for the external
environment of its operation and the results of its implementation.
1) Set display mode
2) Set primary variable display mode
3) Set process variable unit
4) Set SV variable unit
5) Set the number of decimal points
6) Set lower range value (LRV)
7) Set upper range value (URV)
8) Set active zero output with reference pressure
9) Set active full scale output with reference pressure
10) Set damping time
11) Set fault alarm current
12) Set whether to alarm when the range exceeds the limit
13) Set simulation current fixed output
14) Change HART address
15) Primary variable zero adjustment
16) Set output signal function
17) Set pressure type
18) Set low signal cutoff value