Microsensor MDM6000 Series User manual

MDM6000
Operation Manual
V1.1

CONTENTS
1 Preface.................................................................................................1
2 Safety Precautions...............................................................................1
3 Outline and installation.........................................................................2
4 Electrical connection..........................................................................12
5 Menu Operation..................................................................................16
6 Operation, maintenance and troubleshooting....................................21
7 Unpacking, Components and Storage...............................................24
8 Responsibility.....................................................................................24
The company reserves the right to modify this manual due to product
technology and process updates. This manual is subject to change with
no further notice.
Please note the latest version of this manual.
The Company reserves the right of final interpretation of this manual.
Version number of this manual: V1.1

1
1 Preface
Thank you very much for choosing the products of MICRO SENSOR
CO., LTD. It is recommended to read this manual carefully before any
operation.
1.1 Product Overview
MDM6000 series intelligent pressure transmitter
adopts-mono-crystalline piezoresistive technology, and uses the
avanced design concept. The sensor element is positioned at the top of
the metal body, far from the media contact surface, to achieve
mechanical and thermal isolation, and the high-strength electrical
insulation between the glass sintered sensor lead and the metal
substrate improves the flexibility of the electronic circuit and the ability to
withstand transient voltage protection, which can cope with complex
chemical occasions and mechanical load, while having strong
anti-electromagnetic interference capability, suitable for harsh process
industrial environment.
1.2 Edition statement
The copyright of this manual is reserved by Micro Sensor Co., Ltd. Any
form of unauthorized modification, interception, or reproduction is
prohibited without written permission. If any error or omission in this
manual is found, please contact the company.
2 Safety Precautions
a) Pressure transmitter should be installed, debugged and maintained
by professional engineers or qualified technical personnel. Please
carefully read product specifications and important information
provided on the label before installation.
b) Pressure transmitter is powered by an external power supply, the
power supply circuit should comply with energy-limiting circuit by
relevant standards, and pay attention to the high voltage circuits
there may exist.

2
c) If the product is used in hazardous area, the installation, operation
and maintenance should comply with the operation manual and
relevant requirements of national standards.
d) Be careful to tear down the instrument under the normal
atmospheric pressure.
3 Outline and installation
3.1 Product installation environment
3.1.1 Environmental condition
Operation Temperature：-40℃～85℃，With LCD display：-20℃～70℃
Storage Temperature：-40℃～100℃，With LCD display：-40℃～85℃
Ambient humidity range：5%RH～100%RH@40℃
3.1.2 Electromagnetic environment
Radiated interference：≤1000MHz
Radio frequency electromagnetic field interference≤10V/m（80MHz～
1GHz）； Electrostatic interference≤8kV
Power frequency magnetic field interference≤30A/m
3.1.3 Installation location selection
a) Please avoid locations subject to wide temperature variations or a
significant temperature gradient. And if the site equipment is
exposed to heat radiation, please take measures for insulation and
ventilation.
b) It is not recommended to install the transmitter in the corrosive
environment. If it is unavoidable, ventilation measures must be
taken and be careful to prevent the rainwater from penetrating into
the cable lines.
c) Although the transmitter is designed to be resistant to shock and
vibration. Try to install in places with low shock and vibration.
Warning
Avoid installation in places with large temperature differences, easy
condensation, easy icing and high vibration

3
3.2 Transmitter installation
The transmitter housing can rotate about 300 °against the sensor and
can be fixed at any position without affecting the performance and
internal wiring. When rotating the housing, it is not allowed to forcibly
rotate the sensor part. Loosen the setscrew with a 2mm hex wrench but
not screw it out completely. Retighten the screw after confirming the
installation position. This minimizes the impact on electronic circuit
connections and output displays. The installation is shown in the
following figure:
3.2.1 Smart gauge/absolute pressure transmitter –installation
3.2.2 Intelligent differential pressure transmitter - bracket mounting
Figure1 (Direct installation)
Figure 2 (Bracket mounting)
图2
Figure 5 (Flat Bracket
for pipeline)
Figure 4 (Bending
bracket for
panel mounting)
Figure 3 (Bending
bracket for 2"pipeline)

4
3.2.3 Differential pressure transmitter with remote seal - bracket
mounting
3.2.4 Intelligent differential pressure level transmitter
Figure 6 (Bending
bracket for 2" pipeline)
Figure 7 (Bending bracket
for panel mounting)
Figure 9 (Flush type)
Figure 10 (extended)
Figure 8 (Flat Bracket for
pipeline)

5
3.2.5 Pressure process connection
Unit in mm
MDM6000 With Display
MDM6000 Without Display
MDM6000 With Display
MDM6000 Without Display
Figure 13 (differential pressure)
Figure 14 (differential pressure)
Figure 11 (Gauge/Absolute)
Figure 12 (Gauge /Absolute)

6
MDM6000 With Display
MDM6000 Without Display
MDM6000 With Display
MDM6000 Without Display
Figure17 (Differential pressure level
transmitter with flush mount)
Figure 15 (Differential pressure
transmitter with remote seal)
Figure 16 (Differential pressure
transmitter with remote seal)
Figure18 (Differential pressure level
transmitter with flush mount)

7
MDM6000 With Display
MDM6000 Without Display
MDM6000 With Display
MDM6000 Without Display
Figure 19 (Differential pressure level
transmitter with the extension)
Figure 20 (Differential pressure level
transmitter with the extension)
Figure 21 Smart Gauge-T/Absolute-T
(Standard connection)
Figure 22 Smart Gauge-T/Absolute-T
(Standard connection)

8
MDM6000 With Display
MDM6000 Without Display
MDM6000 With Display
MDM6000 Without Display
Figure 23 Smart Gauge-T/Absolute-T
(Capillary tube Connection)
Figure 24 Smart Gauge-T/Absolute-T
(Capillary tube Connection)
Figure 25 Smart Gauge-T/Absolute-T
(Fixed capillary connections)
Figure 26 Smart Gauge-T/Absolute-T
(Fixed capillary connections)

9
MDM6000 With Display
MDM6000 Without Display
Figure 27 Smart Gauge-T/Absolute-T
(Heatsink connection)
Figure 28 Smart Gauge-T/Absolute-T
(Heatsink connection)

10
3.2.6 Valve manifold optional
The transmitter can also be equipped with a variety of manifolds, the
schematic diagram is as follows:
The second valve manifold is composed of a globe valve (switch or
conduction) and a discharge valve (usually dirt, or water and gas), its
function is to open or cut off the pipeline passage, and the flow direction
of the applicable medium should be consistent with the direction of the
arrow on the valve body during installation.
Opening steps
a) Check all valves to make sure they are closed;
b) To avoid pressure fluctuations, the shut-off valve should be
opened slowly to allow the transmitter to function properly.
To deactivate, follow the opposite steps.
The three-valve manifold consists of a valve body, two globe valves and
a balancing valve. According to the role played by each valve in the
system, it can be divided into; Positive cavity globe valve, negative
Figure 29 (two-valve manifold)
Figure 30 (three-valve manifold)
Figure 31 (five-valve manifold)

11
cavity globe valve, the middle is a balance valve. The three-valve
manifold is used in conjunction with the differential pressure transmitter,
and the function is to turn the positive and negative pressure measuring
chamber on or off from the impulse point; Or disconnect or turn on the
positive and negative pressure measuring chambers. The five-valve
manifold is to add a blowdown valve to the high and low pressure side
on the basis of the three-valve manifold.
Opening steps
a) Close the blowdown valve (five-valve manifold) and open the
balance valve;
b) To avoid pressure fluctuations, the positive cavity shut-off valve
should be opened slowly, and the positive cavity blowdown
valve should be opened (to remove the air in the pressure pipe.
If the medium is liquid, close the valve when the liquid flows out;
If the gas is exhausted for about 20s, close this valve);
c) close the balancing valve;
d) In order to avoid pressure fluctuations, the negative cavity
shut-off valve should be opened slowly, and the negative cavity
blowdown valve should be opened (to exclude the air in the
pressure pipe. If the medium is liquid, close the valve when the
liquid flows out; If the gas is exhausted for about 20s, close this
valve).
To deactivate, follow the opposite steps.
For proper installation, the following points are recommended:
⚫The pressure pipe should be as short as possible and avoid sharp
bends;
⚫The installation slope of pressure pipe shall not be less than 1:12 to
avoid sedimentation;
⚫Before connecting the pressure pipe to the transmitter, it must be
blown once with compressed air, and it is better to flush the pipe
with the measured medium;
⚫If the medium is liquid, completely blow-down the pressure pipe;

12
⚫The layout of pressure pipe shall enable bubbles in the measured
liquid or condensate in the measured gas to return to the process
pipe;
⚫It shall be ensured that the high and low pressure sides of the
pressure pipe are correctly connected, fastened and reliable without
any leakage.
⚫Before connecting the pressure process, please confirm that the
relevant pipeline is smooth and the strength of the relevant
structural parts is sufficient;
⚫When making a pressure process connection, please confirm that
the relevant valve is closed;
⚫After the connection is completed, please confirm that the
connecting part of the medium is well sealed; When exhaust liquid
is required, corresponding safety measures should be taken;
⚫Avoid personal injury and property damage caused by high
pressure or corrosive media.
4 Electrical connection
4.1 Electrical connection
Relevant guiding regulations must be observed during the electrical
connection. The transmitter does not come with a power switch,
therefore it must be equipped with an overcurrent protection or power
cut-off device.
Be sure the operation voltage is identical to that specified on the
nameplate. The electrical connection can be made to the terminal block
via NPT1/2 or M20×1.5 cable inlet.
Explosion-proof type and explosion-proof mark
Explosion-proof type: Intrinsically safe type, flameproof type
Explosion-proof signs:Ex iaⅡC T4 Ga/Ex dbⅡC T6 Gb
Degree of protection:IP67
Intrinsically safe parameters: Ui:28V；Ii:100mA；Pi:0.7W；Ci:0μF；
Li:0.01mH

13
4.1.1 Two-wire power cord connection
4.1.2 Two-wire Hart communication connection
Warning
Explosion-proof transmitter must be cut off after the power
supply before wiring, wiring should be completed by tightening
the back cover and screwing the connector to tighten the cable
to achieve the purpose of dustproof and waterproof, fixed cable.
Figure 32
Figure 33

14
4.1.3 Four-wire RS485 communication connection
4.2 Notes
a) Keep the wiring as short as possible;
b) It is recommended to use the shielded twisted pairs signal cable to
ground. To avoid grounding loops, the shield is grounded at a single
end, insulated from the transmitter housing and also grounded at
the side of the cabinet;
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 earthing
terminal to the ground with an impedance of ≤ 5Ω;
d) Avoid direct contact with the user devices or the wires of electrical
appliances or electronics;
e) The cable conduit size on the case side is M20×1.5. Please connect
it with the matched cable;
f) Explosion-proof transmitters must be cut off after the power supply
before wiring, wiring should be completed by tightening the back
cover and screwing the connector to tighten the cable, to achieve
the purpose of dustproof and waterproof, fixed cable;
g) Keep the instrument installed away from the high-power electrical
equipment, and the shielded cable (with shield double-end
grounded) is recommended.
Figure 34

15
4.3 Cable Protection
a) Standard protection:
To avoid liquid flowing along the cable, causing effusion at the
waterproof joint or inside the junction box, be sure the cable connecting
the junction box and the pressure transmitter is in a U-shape as shown
in the figure, and the lowest point of the "U" is lower than the pressure
transmitter position. Also, keep the cable of sufficient length in
consideration of maintenance and replacement.
b) Cable protection with the support of explosion-proof flexible tube
When installing and using flameproof pressure transmitters in hazardous
situations, metal explosion-proof flexible tubes should be used to
connect the signal cable to the threading box and lead to a safe area.
Figure 35
Figure 36

16
4.4 power supply
It is recommended to use an independent linear DC power supply for
the pressure transmitter, cause the resistance load can lead to the
voltage drop. The total resistance load is the sum of the resistance of
the signal leads and load resistance of controller, indicator and other
pieces and must meet the requirements.
⚫4mA~20mAwith HART version:16.5V~55V DC.
⚫For intrinsically safe current signal output:18.5V~28V DC.
5 Menu Operation
5.1 Key definition
The local buttons of S, Z, M, have the following functions:
5.1.1 "Enter/Confirm"
Press the button "M", hold it for 0.1s, release it, the "Enter/confirm"
function will be activated.
5.1.2 "Set/Switch key"
Press button "Z", hold it for 0.1s, then release; the "Set/Switch" function
will be activated.
5.1.3 "Modify"
Press the button "S or Z", hold it for 0.1s, and then release; The"Modify"
function will be activated.
5.2 Key press guide
For example, the factory setting parameters of the pressure/differential
pressure transmitter: measuring range -10kPa~100kPa, placed in the
atmosphere for operation, quick operation The picture is as follows:

17

18