DewPro MDR3 probe

DewPro MDR3 Relative Humidity Probe

DewPro MDR3 Series probe includes a removable filter cap for easy cleaning in dirty applications. The probe incorporates a polymer dielectric capacitance sensor for quick response times and accurate dew point measurements as well as a platinum RTD for temperature measurement. The MDR3 has been approved by SIRA (CENELEC) and FM (Factory Mutual, USA) as EEx ia IIC T4 for use in hazardous areas with intrinsic safety barriers.

Features:

Proven, polymer capacitive sensor
Platinum RTD temperature sensor
Trouble-free indoor or outdoor mounting
Approved for use in hazardous areas with intrinsic safety barriers

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DewPro MDR3 Relative Humidity Probe

SPECIFICATIONS

Sensing Element: Silicon-based polymer, capacitance principle, IC electronics

RH Range: 0 to 100%

RH Accuracy: ± 2% in the range of 0% to 90%
±3% in the range of 90% to 100%

Dew Point Range: -15°C to +75°C (5°F to 167°F)

Dew Point Accuracy: Better than ± 1°C (± 1.8°F) if T>30°C (86°F) and RH>40%, T<30°C (86°F) and RH>30%

Repeatability: Better than 0.5% RH

Hysteresis: Less than ± 0.9%

Standard Operating Temperature: -10°C to +85°C (14°F to 185°F)

Temperature Accuracy: ± 0.5°C (± 0.9°F)

Maximum Operating Pressure: 250 psig (17 bar)

Sensor Electronics: Integrated circuitry with a platinum RTD temperature sensor

Signal Transmission: Moisture and temperature frequencies allowing 1000 ft. (350 meters) of standard four-wire cable (shielded to maintain EMI/RFI/ESD resistance)

Probe Tube: 316 stainless steel; 0.5” diameter; 6.8” long (12.7 mm x 172 mm)

Typical Probe Mounting: 0.5” tube x 0.5” MNPT compression fitting or ANSI flange

Sensor Guard: Rugged, removable, easy-to-clean, 100 micron sintered 316 L stainless steel filter; additional hydrophobic filter on the sensor element allowing the penetration of water vapor but not water droplets

Weight: 0.5 lbs. (0.23 kg)

Approval: CENELEC, FM (Eex ia) IIC T4, 95°C (203°F) using the Zenar barrier kit IS 20 ST from General Eastern or equivalent

Ordering Information MDR3
1 2 3 4 5

1 Mounting Hardware
1 3” galvanized floor flange with 12.7 mm compression fitting
2 _” MNPT compression fitting
3 _” MNPT compression fitting
4 _” x 16 “O” ring compression fitting
1 Probe mounted directly to the analyzer (must use cable option “5” and
MR2250 enclosure option “2”)
1 No mounting hardware
8 G 1 / 2 compression fitting, gasket, SS ferrule
9 Other

2 Probe Structure
A Probe length 212 mm (8.35”), diameter 12.7 mm (1/2”)
B Probe with MNPT welded on (or junction box mounting)
C Probe with junction box (must use cable option “5”)
K K-version, probe length 212 mm (8.35”) diameter 12.7 mm (1/2”) (Harting
connector)
N Split-version, 212 mm, diameter 12.7 mm with 9” cable length (Special for
Nuclear Power Plants and bio-filter)
Y Other
3 Analyzer Version
22 For use with rh-plus 2250
28 For use with 2850 (order only structure B or C)
99 Other

4 Certification
F FM, Class 1, Div. 1, Groups A-D (Probe structure “A” or “C”)
K Certificate for nuclear power plants
R Standard configuration, not certified
S CENELEC, (Eex ia) IIC, T4 (95(C) (Probe structure “A” or “C” for use with
2250 only)

5 Cable Length
1 500 cm (17 feet) standard
2 50 cm, Harting connector (K-version) (1.64 feet)
3 cm Cable Length (50 to 30000 cm) (Price based on units of 100 cm)
4 1’ to 1000’ (Price based on units of 1 ft.)
5 *Without cable
9 Other

* For “5” option on mounting hardware for “C” option Probe structure