Murata DMS-PS4-CM Loop-powered, 1.8v drop, 4-20ma process monitors with full-size lcd display Datasheet

DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
FEATURES
Murata Power Solution’s new DMS-30LCDA-4/20 Series’ 1.8V nominal loop-drop is the
lowest of any comparably priced, 4-20mA input, 3½-digit process monitors with full-size
LCD displays. This super-low loop-drop guarantees a maximum burden of no more than
100 Ohms! And because it’s loop-powered, all operating power is derived directly from the
loop current itself; no separate power source is required! Their floating 2-wire design allows
DMS-30LCDA-4/20 Series process monitors to be connected anywhere in the current loop.
■
Super-low loop drop: 1.8V typical, 2.0V max.
■
Self-powered 2-wire operation; no separate supply required
■
Unipolar, Bipolar, Positive, and Inverse Reading Models
■
Improved-performance replacement for
DMS-30LCD-4/20S
■
Subminiature package; Less than 0.90"
behind-the-panel depth
■
Large, 0.40"/10.2mm high, sunlight-viewable LCD display
■
Available in red, blue or green LED displays
■
Non-interacting gain (span) and offset (zero)
20-turn potentiometers
■
DIP-switch selectable range and decimal points
■
Hundreds of different input-current/readout combinations
■
Vibration-resistant package; reliable
screw-terminal input connections
All decimal point and range-change selections are made via an eight-position DIP switch
which features vibration-resistant, gold-plated contacts—there are no cumbersome jumpers
or solder gaps to contend with. Both gain (span) and offset (zero) adjustments are performed
using 20-turn, non-interacting potentiometers. Four different models accommodate unipolar,
bipolar, positive, and inverse display-reading applications. The DMS-30LCDA-4/20 Series’
DIP switch and adjustment potentiometers can accommodate literally hundreds of different
input-current/output-reading combinations.
DMS-30LCDA-4/20 Series’ subminiature package houses a large, 0.40”/10.2mm, highcontrast LCD display that can be read in virtually all lighting conditions—including full sunlight!
The two connections to the external loop are made via a reliable screw-type terminal block. For
environmentally demanding applications, an optional panel-mount bezel assembly, featuring
screw fasteners and a rubber gasket, provides excellent resistance to dust and moisture. All
these outstanding features combine to make the new DMS-30LCDA-4/20 Series ideal for all
your 4-20mA process-monitoring instrumentation needs.
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For full details go to
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Figure 1. DMS-30LCDA-4/20 Simplified Schematic
www.murata-ps.com
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30-LCDA.B02 Page 1 of 6
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
Performance/Functional Specifications
Typical at TA = +25°C, unless otherwise noted.
Current Loop Input
Min.
Typ.
Max.
Units
Full Scale Input Range
+3.8
–
+20.4
mA
Loop Burden
–
80
100
Ohms
Voltage Drop
–
1.8
2.0
Volts
Overcurrent Protection
–
–
±40
mA
Performance
Sampling Rate
2.5 reading per second
Accuracy (1 minute warm-up)
±0.05%FS ±1 Count
Temperature Drift
–
±0.15
±0.3
Cnts/°C
Display
Display Type and Size
3½ digit, 0.4"/10.2mm reflective LCD
Polarity Indication
"–" for negative readings
Overrange Indication
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
0
–
+60
°C
–20
–
+75
°C
–
85
°C
0
Case Material
Polycarbonate
Weight
0.75 ounces (21 grams)
➀ The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those
resulting from accidental reverse-polarity connections, up to ±40mA without
sustaining any damage.
➁ Because Murata Power Solution’s DMS Series loop-powered process monitors
employ active circuitry to convert the loop current into a voltage, their effective
series impedance (loop burden) varies in a manner that maintains the loop voltage drop relatively constant over the full 4-to-20mA current range. Listed burden
specification applies at 20mA.
➂ When looking up DIP-switch settings in the Tables and the desired display readings can be achieved with either of two different settings, using the higher setting
number will usually result in less sensitive offset (R3) and span (R7) adjustments.
Please keep in mind that the DMS-30LCDA standard meter from which the DMS30LCDA-4/20 is derived has an accuracy specification of ±2 counts (max.). Thus,
it may not always be possible to obtain the exact desired display reading.
Ordering Information
DMS-30LCDA-4/20S**
DMS-30LCDA-4/20B
DMS-30LCDA-4/20P
DMS-30LCDA-4/20I
DMS-BZL1
DMS-BZL2
DMS-30-CP
DMS-PS4-CM
DMS-PS7-CM
Unipolar reading, loop-powered LCD meter
Bipolar reading, loop-powered LCD meter
Positive reading, loop-powered LCD meter
Inverse reading, loop-powered LCD meter
Bezel assembly
Bezel assembly with sealing gasket
Panel cutout punch
+24V/0.45A ac/dc power supply module
+24V/0.7A ac/dc power supply module
** Replaces obsolete DMS-30LCD-4/20S model
A panel-mount retaining clip is supplied with each model.
OPERATING AND SETUP INSTRUCTIONS
Important Instructions for Users of Obsolete
DMS-30LCD-4/20S Meters
The new DMS-30LCDA-4/20S unipolar-reading model has provisions
to accommodate all the display ranges of the obsolete DMS-30LCD4/20S. The “Old Display Readings” column in Table 1 is taken directly
from the DMS-30LCD-4/20S datasheet. Table 1 is provided as a guide
for determining equivalent DMS-30LCDA-4/20S DIP-switch settings in
upgrading existing applications.
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘bipolar’
operation should now use the new DMS-30LCDA-4/20S model configured per Table 1. Bipolar applications are those where a 4mA input
displays a negative number, a 12mA input displays “000”, and a 20mA
input displays a positive number (for example, “-100”, “000” and “100”).
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘unipolar’ operation should now use the new DMS-30LCDA-4/20S configured
per Table 2. Unipolar applications are those where a 4mA input displays
“000” and a 20mA input displays a higher positive number.
Table 1. DMS-30LCDA-4/20S DIP Switch Settings for
DMS-30LCD-4/20S Applications
Old Display Reading
4mA
20mA
New DMS-30LCDA-4/20S DIP Switch Setting
SW1
SW2
SW3
SW4
1. 000 to 100-300
Use Setting in Table 2
2. 000 to 400-600
Use Setting in Table 2
3. 000 to 700-1999
SW5
Use Setting in Table 2
4. ±100
On
On
On
On
Off
5. ±200 to ±300
Off
Off
On
Off
Off
6. ±400 to ±600
On
Off
Off
Off
Off
7. ±700 to ±1900
Off
Off
Off
Off
On
DMS-30LCDA-4/20S (Standard Unipolar-Reading)
The DMS-30LCDA-4/20S’s span and offset circuitry are optimized to
display standard, unipolar readings where a 4mA input always reads
“000” and a 20mA input always displays a higher positive number.
As shipped, the DMS-30LCDA-4/20S is calibrated to read “000” for a
4mA input and “1800” for a 20mA input. These readings are used for
factory test-purposes only. The following worst-case calibration procedure assumes the DMS-30LCDA-4/20S is completely misadjusted,
i.e., both potentiometers and the DIP switches are randomly set.
The next example below, while specifically tailored for the “000” and
“1800” readings just noted, can also be used as a guide when configuring the DMS-30LCDA-4/20S for other unipolar display readings.
When performing DIP-switch settings, be sure the DIP-switch’s small
actuators are firmly engaged in their fully ON or fully OFF positions.
1. Set R7 (span/gain adjust) and R3 (zero/offset adjust) fully clockwise,
roughly 22 turns, and place SW1-SW8 to OFF.
2. Configure the meter per DIP-switch setting #1 in Table 2.
3. Apply a precision 4mA input with proper polarity and adjust R3 until
the meter’s display reads “000”.
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MPM_DMS30-LCDA.B02 Page 2 of 6
DMS-30LCDA-4/20 Series
4. Apply a precision 20mA input and adjust R7 until the display reads “1800”.
Repeat steps 3 and 4 to make sure the adjustments do not affect one
another.
5. Select the appropriate decimal point by setting SW6, SW7 or SW8 to ON
(DP1, DP2 or DP3 respectively).
NOTE: If a display reading other than “000” to “1000” is desired,
refer to DIP-Switch Settings Table 2 for SW1-SW5 settings
Table 2.
Desired Display Reading
4mA
20mA
SW1
SW2
SW3
SW4
SW5
Off
Off
Off
Off
Off
2. 000 to 600 to 1200
On
Off
Off
Off
Off
3. 000 to 400 to 600
Off
Off
On
Off
Off
4. 000 to 200 to 400
On
On
On
Off
Off
5. 000 to 100 to 200
On
On
On
On
Off
When configuring the DMS-30LCDA-4/20B for the first time, or when selecting a
new range, set both R3 and R7 fully clockwise (roughly 22 turns) to their minimum
offset/minimum-span positions, respectively. Then select the desired readings from
Table 3 and configure DIP-switches SW1, SW2, and SW3 accordingly. Please note,
positions SW4 and SW5 are not used in bipolar ‘B’ models.
The procedure below illustrates how to calibrate the DMS-30LCDA-4/20B to its
factory-calibrated readings of “-1000” with a 4mA input and “1000” with a 20mA
input. When performing DIP-switch settings, be sure the DIP-switch’s small actuators
are firmly engaged in their fully ON or fully OFF positions.
DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings
1. 000 to 1200 to 1999
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
1. Set both R3 and R7 fully clockwise.
2. Select DIP-switch setting #1 from Table 3.
3. Apply a precision 12mA input and adjust R3 until the meter’s display reads “000”.
4. Apply a precision 20mA input and adjust R7 until the meter’s display reads “1000”.
5. Apply a precision 4mA input and the display should read “-1000”. Repeat steps 3
and 4 to make sure the two adjustments did not affect one another.
Examples (DMS-30LCDA-4/20S, Unipolar)
Table 3. DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings
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1. Desired display readings are:
Desired Display Reading
4mA ="0.00"
20mA = "6.00"
4mA
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Use DIP-switch setting #3 in Table 2 and enable decimal point DP2 via SW7.
Apply 4mA and adjust R3 so the display reads “0.00”. Apply 20mA and
adjust R7 so the display reads “6.00”.
4mA =" 000"
20mA = "800"
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Use DIP-switch setting #2 in Table 2. Apply 4mA and adjust R3 so the display
reads “000”. Apply 20mA and adjust R7 so the display reads “800”. For
these display readings, no decimal points are used. Set SW6, SW7 and SW8
to OFF.
3. Desired display readings are:
4mA = ".000"
12mA = ".250"
12mA
SW1
SW2
SW3
SW4
SW5
600 to 1000
Off
Off
Off
NA
NA
2. –350 to –650
000
350 to 650
On
Off
Off
NA
NA
3. –250 to –400
000
250 to 400
Off
On
Off
NA
NA
4. –150 to –250
000
150 to 250
Off
Off
On
NA
NA
5. –100 to –150
000
100 to 150
On
On
On
NA
NA
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2. Desired display readings are:
20mA
1. –600 to –1000 000
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1. Desired display readings are:
4mA ="–1.00"
20mA = "1.00"
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This example is not as straightforward as the previous two. Notice that 12mA
is exactly halfway between 4mA and 20mA. If we assume that the input could
go up to 20mA, the display reading would then be: 2 x .250 or “.500”. From
Table 2 we can now select DIP-switch setting #3 and enable DP1 via SW6.
Apply 4mA and adjust R3 so the display reads “.000”. Apply 12mA and
adjust R7 so the display reads “.250”.
Examples (DMS-30LCDA-4/20B, Bipolar )
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DMS-30LCDA-4/20B (Bipolar-Reading )
The DMS-30LCDA-4/20B’s zero-offset circuit differs from the unipolar ‘S’
model described above in that with the ‘B’ model, a half-scale 12mA input is
typically set to display “000”. Therefore, all of the of the DIP-switch settings in
Table 3 assume a reading of “000” is desired with a half-scale 12mA input.
Display readings other than those shown in Table 3 are possible, contact
DATEL for more information.
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Use DIP-switch setting #5 in Table 3 and enable decimal point DP2 via SW7.
Apply 12mA and adjust R3 so the display reads “0.00”. Apply 20mA and
adjust R7 so the display reads “1.00”. Apply 4mA and verify that the display
reads “-1.00”, readjust R3 and R7 if necessary.
2. Desired display readings are:
4mA =" –450"
20mA = "450"
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Use DIP-switch setting #2 in Table 3. Apply 12mA and adjust R3 so the
display reads “000”. Apply 20mA and adjust R7 so the display reads “450”.
Apply 4mA and verify that the display reads “-450”. Repeat adjustment procedure if necessary. For these display readings, no decimal points are used.
Set SW6, SW7and SW8 to OFF.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30-LCDA.B02 Page 3 of 6
DMS-30LCDA-4/20 Series
3. Desired display readings are:
4mA = "–650"
20mA = "650"
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
ON
1
2
3
4
5
6
7
8
Notice that these readings can be obtained using either DIP-switch setting #1
or DIP-switch setting #2 in Table 3. In situations like this where DIP-switch
settings overlap, less-sensitive R3/R7 adjustments can be achieved if the
higher DIP-setting # is selected (setting #2 in this example). Apply 12mA
and adjust R3 so the display reads “000”. Apply 20mA and adjust R7 so
the display reads “650”. Apply 4mA and verify that the display reads “-650”.
Repeat adjustments if necessary.
DMS-30LCDA-4/20P (Positive-Reading)
The DMS-30LCDA-4/20P’s zero-offset circuit is optimized to produce positive readings at both 4mA and 20mA input levels. As shown in Table 4’s first
three columns, a 4mA input can be adjusted (using R3, Zero/Offset Adjust)
to display any positive reading between “000” and “800”. The corresponding
20mA-input reading is then added to the 4mA offset as a differential whose
magnitude is varied by adjusting R7 (Gain/Span Adjust).
The ‘Differential Range’ column in Table 4 lists the nominal differential displayreadings which can be obtained with R7 at, or very close to, its full-clockwise,
minimum span position. The ‘Differential Range’ column can be used as a
guide when configuring the meter for the majority of user applications. Higher
differential ranges are obtainable; however, the use of higher differential readings results in correspondingly-lower positive readings with 4mA inputs, that
is, R3’s clockwise adjustment-range is reduced. Example #3 below illustrates
this point. Contact DATEL if there is any doubt as to whether or not the DMS30LCDA-4/20P can be configured for your display-reading requirements.
The first step when initially configuring the DMS-30LCDA-4/20P, or when
selecting a new range, is to set R3 fully counterclockwise and R7 fully
clockwise (roughly 22 turns each) to their minimum offset and minimum span
positions, respectively.
The next step is to calculate the differential display-reading; this is accomplished by subtracting the desired 4mA display reading from the desired
20mA display reading, disregarding decimal points. Then, using the calculated differential display-reading to select the appropriate DIP-switch setting
# from Table 4, configure DIP-switches SW1, SW2, and SW3 accordingly.
Please note, positions SW4 and SW5 are not used in positive reading ‘P’
models. Also, make certain that the DIP-switch’s small actuators are firmly
engaged in their fully ON or fully OFF positions.
The example below describes how to calibrate the meter for an application
which the DMS-30LCDA-4/20P easily accommodates: displaying the output
of a 4-20mA transmitter, that is, “04.0” with a 4mA input and “20.0” with a
20mA input.
1. Set R3 fully counterclockwise (minimum offset position) and R7 fully clockwise (minimum differential span position), roughly 22 turns.
2. Subtract 040 from 200 to yield a differential-reading value of 160; use this
value to select DIP-switch setting #5 in Table 4. Enable decimal point DP3 by
placing SW8 to the ON position.
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3. Set the transmitter’s output to 4.0mA and carefully adjust R3 clockwise until
the meter’s display reads “000”.
4. Set the transmitter’s output to 20.0mA and adjust R7 counterclockwise until
the meter’s display reads “16.0”.
5. Set the transmitter back to 4.0mA and slowly adjust R3 clockwise until the
display reads “04.0”. Reapply 20.0mA and the display should now read
“20.0”. Repeat steps 3, 4, and 5 to make sure the adjustments did not affect
one another.
Table 4.
DMS-30LCDA-4/20P (Positive Reading)
DIP Switch Settings
Desired Display Readings
Diff. Range
4mA
20mA
SW1
SW2
SW3
SW4
SW5*
1. 800 to 1400
900
1700
Off
Off
Off
NA
OFF
2. 500 to 800
850
1350
On
Off
Off
NA
OFF
3. 350 to 500
800
1150
Off
On
Off
NA
OFF
4. 250 to 350
750
1000
Off
Off
On
NA
OFF
5. 150 to 250
750
900
On
On
On
NA
OFF
* Setting SW5 to On will increase the differential range.
See example 2 below.
Examples (DMS-30LCDA-4/20P, Positive Reading)
1. Desired display readings are:
ON
4mA ="650"
20mA = "950"
1
2
3
4
5
6
7
8
Use DIP-switch setting #4 in Table 4 since subtracting 650 from 950 yields
a differential value of 300. Apply 4mA and adjust R3 until the display reads
“000”. Apply 20mA and adjust R7 until the display reads “300” (the differential value previously calculated). Apply 4mA and adjust R3 until the display
reads “650”. Apply 20mA and verify that the display reads “950”.
2. Desired display readings are:
4mA =" 4.00"
20mA = "19.99"
ON
1
2
3
4
5
6
7
8
This example illustrates the DMS-30LCDA-4/20P’s capability to display
higher differential readings than those indicated in Table 4. This example
also illustrates how the DMS-30LCDA-4/20P can be used to display the
output levels of a 4-20mA transmitter with higher precision (0.01mA versus
0.1mA) than the example previously described.
Subtracting 400 from 1999 yields a differential of 1599, a value not listed
in Table 4. However, use DIP-switch setting #1 in Table 4 and enable SW5
since this setting has the highest overall offset/span adjustment capabilities.
Enable DP2 via SW7, then apply 4mA and adjust R3 so the display reads
“0.00”. Apply 20mA and adjust R7 so the display reads “15.99”. Apply
4mA and adjust R3 until the display reads “4.00”. Apply 20mA and check
to see that the display reads “19.99” or just overranges (“1—”). Repeat
adjustment procedure if necessary.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30-LCDA.B02 Page 4 of 6
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
Examples (DMS-30LCDA-4/20I, Inverse Reading)
DMS-30LCDA-4/20I (Inverse Reading)
The DMS-30LCDA-4/20I is designed to accommodate applications where
an increasing loop current produces a decreasing display reading. That
is, as the loop current is increased from 4mA to 20mA, the display will read
a user determined full-scale positive number at 4mA and then decrease to
“000” at 20mA. The ‘4/20I’ model is essentially a ‘-4/20S’ model operating
in reverse. Table 5 and the two examples that follow describe the operation
of this model in greater detail.
1. Desired display readings are:
The first step when configuring the DMS-30LCDA-4/20I for the first time,
or when changing to a different range, is to set both R3 and R7 to their full
clockwise positions, roughly 22 turns. Next, using the desired display readings, select the appropriate DIP-switch setting number from Table 5.
2. Desired display readings are:
20mA = “0.00”
1
2
3
4
5
6
8
7
Use DIP-switch setting #3 in Table 5 and enable decimal point DP2 via SW7.
Apply 20mA and adjust R3 so the display reads “0.00”. Apply 4mA and
adjust R7 so the display reads “6.00”.
ON
4mA = “800”
20mA = “000”
Desired Display Reading
20mA
SW1
SW2
SW3
SW4
SW5
1. 1999 to 1300
000
Off
Off
Off
Off
NA
2. 1300 to 850
000
On
Off
Off
Off
NA
3. 850 to 550
000
Off
On
Off
Off
NA
4. 550 to 350
000
Off
Off
On
Off
NA
5. 350 to 200
000
On
On
On
Off
NA
6. 200 to 130
000
On
On
On
On
NA
1
2
3
4
5
6
7
8
Use DIP-switch setting #2 in Table 5. Apply 20mA and adjust R3 so the
display reads “000”. Apply 4mA and adjust R7 so the display reads “800”.
For these display readings, no decimal points are used. Set SW6, SW7 and
SW8 to OFF.
Table 5. DMS-30LCDA-4/20I (Inverse Reading) DIP Switch Settings
4mA
ON
4mA = “6.00”
Table 6. Decimal Point Selections (All Models)
To turn on a decimal point, place its respective DIP switch to the fully ON position.
SW6
DP1
SW7
DP2
SW8
DP3
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm)
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STRIPPING LENGTH:
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WIRE SIZE:
2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
18 to 26 AWG
(Solid or stranded)
0.20" (5.08mm)
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TOLERANCES:
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Back View
DIP
Switches
Zero
Adjust
1
2
3
4
Front View
1
ON
R3
Zero
Adjust
5
6
7
8
TB1
R7
Gain
Adjust
Gain
Adjust
+
–
+ –
Loop
Input
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DP1
(SW6)
DP2
(SW7)
DP3
(SW8)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30-LCDA.B02 Page 5 of 6
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
BEZEL INSTALLATION
OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)
FRONT VIEW
#2-56 INSERT
0.156 (3.96) DEEP
0.187
(4.75)
PANEL
®
®
1.270
(32.26)
MADE IN USA
BEZEL
2.55 (64.77)
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18)
PANEL CUTOUT
0.116
(2.95)
RETAINING CLIP INSTALLATION
0.878
(22.30)
PANEL
2.118 (53.80)
0.096
(2.44)
MADE IN USA
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: [email protected] ISO 9001 and 14001 REGISTERED
11/25/08
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice. © 2008 Murata Power Solutions, Inc.
www.murata-ps.com
®
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
®
2.35 (59.69)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada:
Toronto, Tel: (866) 740-1232, email: [email protected]
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany:
München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Singapore:
Parkway Centre, Tel: +65 6348 9096, email: [email protected]
Technical enquiries email: [email protected], tel: +1 508 339 3000
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