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Series CRF2 Capacitive Level Transmitter

Specifications - Installation and Operating Instructions

Bulletin L-36

The Series CRF2 is a level transmitter providing a two-wire 4 to 20 mA

output to indicate level of liquids, powders and bulk materials. State of

the art sensing technology in the CRF2, using impulse RF admittance

measurement provides excellent accuracy and stability. The CRF2

senses capacitance changes resulting from the height of the material in

the tank between the probe and the tank wall. In non-metallic tanks or

tanks that do not have the wall parallel to the probe a ground reference

must be used.

The CRF2 comes with either a rigid or flexible probe depending on

application installation need and probe length required. Featured in the

CRF2 is easy push button calibration of zero and span. Custom order

the CRF2 to any length probe that you need for your application. FEP

covered probe is ideal for use with corrosive media.

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

P.O. BOX 258 • MICHIGAN CITY, IN 46360 U.S. A.

Phone: 219/879-8000 www.dwyer-inst.com

Fax: 219/872-9057 e-mail: info@dwyer-inst.com

SPECIFICATIONS

Service: Liquids, powders, and

bulk materials compatible with

wetted materials.

Wetted Materials: Standard:

rod/cable: FEP; connection: 316

SS. Ground Option: rod/cable

and connection: 316 SS; cable

spacers: PVC. Flange Option:

material of flange.

Capacitance Range: 0 to 2000

pF.

Sensitivity: 0.15 pF.

Minimum Span: 8 pF.

Accuracy: ±0.5 pF or ±0.25% of

span, whichever is greater.

Repeatability: ±0.25 pF or

±0.1% of span, whichever is

greater.

Temperature Limits: Ambient: -

40 to 185°F (-40 to 85°C);

Process: -40 to 250°F (-40 to

121°C).

Pressure Limit: 100 psi (6.9

bar).

Power Requirements: 12 to 35

VDC.

Output Signal: 4 to 20 mA or 20

to 4 mA, 2 wire.

Response Time: 0.5 seconds.

Electrical Connection: Screw

terminal.

Conduit Connection: 1/2˝ NPT

female.

Process Connection: Standard:

3/4˝ NPT male. Optional: See

model chart.

Enclosure Rating: NEMA 4X

(IP66) weather-tight/corrosion

resistant.

Spark/Static Protection: 10

dissipation resistance with spark

gap. Surge current to 100A max.

Calibration: Zero, Span, 4 mA,

20 mA.

Mounting Orientation: Vertical.

Weight: 6 ft rod type: 3.6 lb (1.63

kg).

2X 1/2 FEMALE NPT

CONDUIT CONNECTION

3-19/32

(91.28)

4-1/2

(114.30)

3/4 MALE

NPT

PROCESS

CONNECTION

9/16

(14.29)

4-3/16

(106.36)

2X 3/4 (19.05)

CLEARANCE FOR

COVER REMOVAL

“L”

CONTINUOUS LEVEL TRANSMITTER

MOD CRF2

SERIAL:

INDUSTRIAL CONTROL EQUIPMENT

A DIV ISI ON OF

DWYER IN STR UMEN TS, IN C.

MICHI GAN CI TY, I N 4 6360 , U .S. A.

2X 1/2 FEMALE NPT

CONDUIT CONNECTION

4-7/16

(112.7)

2-3/8

(

60.3)

MOUNTING

BRACKET

1-3/8

(34.9)

2-3/4

(70.0)

3-1/4

(82.6)

-5/32

(

80.2)

(152.4)

3/4 MALE NPT

PROCESS CONNECTION

“L”

1 2 3 4

MERCOID DIVISION 1

Résumé du contenu

Page 1 - MERCOID DIVISION

Series CRF2 Capacitive Level TransmitterSpecifications - Installation and Operating InstructionsBulletin L-36The Series CRF2 is a level transmitter pr

Page 2

OPERATING PRINCIPLECapacitance and DielectricsCapacitance is the property of two or more conductors to store a chargewhen there is a voltage diff

Page 3

Mounting Location• The process temperature and ambient temperature must be within the specified limits.• The probe must be located away from tank inle

Page 4

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Dwyer CRF2 Manuel d'utilisateur

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