Michell Instruments SF72 Specifications

Humidity and Dew-Point Instruments

SF72

Dew-Point Transmitter

The SF72 dew-point transmitter is a compact sensor designed for use in industrial dryer
applications at the key –50 to +10°Cdp measuring points, where response speed, reliability and
long term stability of data within a control process is critical.

The transmitter is pressure rated to 450 bar, ensuring process gas safety, through the use of a
10-year field-proven stainless steel body and glass-to-metal seal. The SF72 has three alternative
industry-standard sample block connections giving form, fit & function benefits.

Our polymer based sensor is calibrated on a high volume traceable calibration system, providing
OEM quantities of units, each with an 8-point traceable calibration certificate.

Highlights

• Ideal for membrane and refrigeration dryer use

• Compatible with
2 to 6 requirements

• Dew point measurement range –60 to +60°Cdp

• Fast response

• 316 stainless steel IP66 construction

• 8-Point traceable calibration certificate

• Accuracy ±2°Cdp

• G 1/2” BSP, 3/4” and 5/8” UNF process connections

• Service exchange program

Compressed Air Quality ISO8573.1

Class

Applications

• Compressed air

• Membrane dryers

• Desiccant dryers

• Breathing air

• Hydrogen coolant

• Inert and bulk gases

• Glove boxes

• Welding gases

• Hazardous areas

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Humidity and Dew-Point Instruments

Technical Specifications

Performance

Measurement range
(dp)

Accuracy (dp) ±2°C dew point
Repeatability ±0.2°C dew point
Long term stability Less than 1% per year at reference conditions
Calibration Traceable 8-point calibration certificate

Electrical Specifications

Output signal 4–20 mA (2-wire connection, current source)
Output Dew point
Analog output scaled

range

Supply voltage 12–28 V DC
Load resistance Max 250 Ω @ 12 V (500 Ω @ 24 V)
CE conformity Approved
UL61010-1 & CAN/CSA C22.2 No. 61010-1

Operating Specifications

Operating temperature –40 to +60°C
Operating pressure 45 MPa (450 barg) maximum
Over pressure rating x2 operating pressure 90 MPa (900 barg)
Flow rate 1 to 5 Nl/min mounted in standard sampling

Thermal compensation Characterized over operating range

Mechanical Specifications

Ingress protection IP66 in accordance with standard

Housing material 316 Stainless steel
Dimensions L=132mm (incl. connector & HDPE Filter) x

Filter Standard HDPE Guard <10μm

Process connections
and material

Weight 150g
Electrical connections Hirschmann GDS series (DIN 4350-C)
Digital diagnostic

communications

–60 to +60°C dew point

Standard –60 to +60°C
–50 to +50°C
–50 to +30°C
Non-standard available upon request

block; 0 to 10 m/sec
(0 to 32.8 fps) direct insertion

BS EN 60529:1992
NEMA 4 in protection accordance with standard
NEMA 250-2003

ø27mm

Optional Sintered guard 80μm

G 1/2” BSP, 3/4” — 16 UNF, 5/8” — 18 UNF
316 Stainless steel

RS485, 2-wire Modbus RTU

Dimensions

SENSOR

10mm

(0.39”)

132mm

ø27mm

(1.06”)

(5.19”)

g

g

10mm
(0.39”)

g

g

h

46mm
(1.81”)

h

h

3/4” UNF

SENSOR

g

g

27 A/F

1/8” NPT

10mm

(0.39”)

10mm

(0.39”)

132mm

ø27mm

(1.06”)

ø27mm

(1.06”)

(5.19”)

SENSOR

132mm

(5.19”)

55.2mm

g

10mm
(0.39”)

10mm
(0.39”)

1/8” NPT

g

h

g

g

g

g

46mm
(1.81”)

5/8” UNF

46mm
(1.81”)

G1/2” BSP

h

5/8”-18 UNF,
3/4” - 16 UNF,
G 1/2” BSP

5/8” - 18 UNF Bonded Seal

h

h

G1/2” BSP Bonded Seal

h

h

Electrical Connections

4-20 mA connections 2-wire

Pin 1 4-20 mA

Pin 3 POWER

3/4” - 16 UNF O-Ring

27mm
(1.06”)

A/F

ø18.72 x 2.62mm

(ø0.75 x 0.09”)

G 1/2” Process Connection

27mm
(1.06”)

A/F

ø25.4 x 2mm

(ø1 x 0.07”)

27mm
(1.06”)

A/F

ø28.65 x 2.61mm

(ø1.12 x 0.10”)

5/8” Process Connection

ø30mm

30mm

5/8”-18 UNF,

3/4” - 16 UNF,

G 1/2” BSP

Sample Block (optional)

g

g

g

45mm
(1.77”)

45mm
(1.77”)

45mm
(1.77”)

g

g

g

g

g

g

g

g

g

Related Process Products

SF52

Dew Point Transmitter

Michell Instruments 48 Lancaster Way Business Park, Ely, Cambridgeshire, CB6 3NW
Tel: [phone], Fax: [phone], Email: [e-mail], Web: www.michell.com/uk

Michell Instruments adopts a continuous development programme which sometimes necessitates specification changes without notice.
Issue no: SF72_97324_V5_UK_0518

© Michell Instruments 2018

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