Dwyer CRF2 - Manual

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: [email protected]
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
6 Ω
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 DIVISION OF DWYER INSTRUMENTS, INC. MICHIGAN CITY, IN 46360, 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)
3-5/32
(80.2)
6
(152.4)
3/4 MALE NPT
PROCESS CONNECTION
“L”