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DewPro
MMY31 Dew Point Transmitters
The DewPro MMY31 measures dew point or ppmv in dry gases. It is a
cost-effective, loop-powered dew point transmitter designed for “in-line”
installation where a trace moisture measurement is required, but display,
alarms, and other features are not needed. The planar capacitive aluminum
oxide sensor provides excellent corrosion resistance, longer calibration
stability, quick response times, and an exceptionally low temperature
coefficient.
The MMY31 mounts directly in-line for applications
such as glove boxes, where a bypass is not appropriate. It is easily
installed via a 1/2” MNPT or G 1/2 adjustable insertion length compression
fitting. Applications include glove boxes, environmental chambers, and
high altitude testing.
Features:
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4 to 20 mA
loop-powered |
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1/2” MNPT or G 1 / 2 process connection |
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Planar capacitive sensor |
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Class 1, Division 2
standard |
Options
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English or Metric
fittings |
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Class 1, Division 1 approval |
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On-board
display and user interface |
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External displays available with
loop-power supplies and/or alarm
contacts
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原廠目錄下載 (PDF Format, 1 pages,
150 KB.)
DewPro
MMY31 Dew Point Transmitters
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SPECIFICATIONS
Sensing Element:
Planar sensor, aluminum oxide capacitance
principle
Measurement Range: -90°C to +10°C (-130°F to +50°F) dew point temperature; 0 to
10, 0 to 1000 ppmv, (fully adjustable with integral
display)
Recommended Recalibration Cycle: 12
months, depending on the application
Calibration Accuracy: ± 2°C (±
3.6°F) dew point over the entire range
Repeatability: ± 1°C (±
1.8°F)
Maximum Sensor Relative Humidity:
50% at dew point temperature >0°C
(32°F)
Temperature Coefficient:
Td/T < 0.2°C/°C (<.36°F/°F)
Operating Temperature: -40°C to
+60°C (-40°F to +140°F)
Storage
Temperature: -40°C to +60°C (-40°F to
+140°F)
Sintered Filter: 100 micron
Standard Operating
Pressure: 0 – 1750 psig (0 – 120 bar)
Helium Leak-rate: < 10-6
mbar l/s
Output: 4
to 20 mA, 16 µA resolution
Electronics:
Microprocessor-controlled
Power Supply: 24 VDC nominal,
12 to 30 VDC tolerance
Protection:
NEMA 4X (IP 67)
Weight: 4.4 lbs. (2
kg.)
Probe Tube: 316 stainless steel, 1/2” (12.7) mm) diameter,
insertion length 2” (50 mm) to 3.5” (90 mm)
Standard Probe Mounting: 1/2”
tube x 1/2” MNPT or 1/2” tube x G 1 / 2 compression fitting. Others
available, consult factory
Ordering Information
MMY31
1 2 3 4 5
1 Approvals
R No approvals
A FM approved intrinsically safe Class I, II,
III, Div. 1, Grps.A-G (I.S. power supply or intrinsically safe barriers
required)
B FM approved explosion proof, Class I, Div. 1, Grps.
A-D
C FM approved non-incendive Class I, Div. 2, Grps. A-D; Dust
ignition proof Class II, III, Div. 1, Grps. E-G
Y Other
2 Process
Connection
3 1/2” NPT
compression fitting
5 No mounting hardware
8 G 1/2 male thread
fitting, gasket, ferrula
9 Other
3 Protection Cap
A Standard 100 micron fitting
B Cap with 4 x 0.25”
holes
9 Other
4
Enclosure Conduit
1 1/2” NPT, female with cable
gland and plug
2 PG – 16 female with cable gland and plug
9
Other
5 Units,
Range, Display, Fault Status
A Dew point, -90°C to +10°C (-130°F to +50°F), no display, 22
mA
D Concentration, 0 to 100 ppm, @ 1 bar, no display, 22 mA
G
Selectable parameters and ranges, integral display and user interface
Y
Other
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露點訊號傳輸器
/ DewPro MMY 31 
