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®
SERIES CRF2 | MERCOID CAPACITANCE LEVEL TRANSMITTER
FEATURES/BENEFITS
• State of the art sensing technology, uses impulse RF admittance
measurement which provides excellent accuracy and stability
•Comeswitheitherarigidorexibleprobedependingonapplication
installation need and probe length required
• Easy push button calibration of zero and span
•Anylengthprobecanbecustomerorderedforanyspecicapplication
• FEP covered probe is ideal for use with corrosive media
• Immune to external RF sources like walkie-talkies and cell phones as
well as minimal interference with radio communication or other electronic
system
APPLICATIONS
• Pulp and paper processing
• Chemical processing
• Food and beverage
• Aggregates
• Plastics
• Mining
DESCRIPTION
The SERIES CRF2 Capacitive Level Transmitters provide a two-wire 4 to 20 mA output
to indicate level of liquids, powders and bulk materials. 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.
SPECIFICATIONS
Wetted Materials
Capacitance Range 0 to 2000 pF.
Minimum Span 8 pF.
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.
Electrical Connection 0.5 s.
Mounting Orientation Screw terminal.
Conduit Connection 1/2˝ NPT female.
Process Connection
Enclosure Rating NEMA 4X (IP66) weathertight/corrosion resistant.
Spark/Static Protection 10 M Ohm dissipation resistance with spark gap. Surge current to 100 A max.
Mounting Orientation Vertical.
dwyer-inst.com
Service Liquids, powders, and bulk materials compatible with wetted materials.
Standard: rod/cable: FEP; connection: 316 SS. Ground Option: rod/cable and connection: 316 SS; cable spacers:
PVC. Flange Option: material of ange.
Sensitivity 0.15 pF.
Accuracy ±0.5 pF or ±0.25% of span, whichever is greater.
Standard: 3/4˝ NPT male. Optional: 1˝, 1-1/2˝, NPT or BSPT, 1˝, 1-1/2˝, or 2˝ sanitary clamp, 2˝, 3˝, or 4˝ 316SS or
PVC 150# ange.
Calibration Zero, Span, 4 mA, 20 mA.
Weight 6 ft rod type: 3.6 lb (1.63 kg).
DWYER INSTRUMENTS, INC.
T: 219-879-8000 | F: 219-872-9057 | [email protected]
800-872-9141
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®
DIMENSIONS WIRING DIAGRAM
POWER
RECEIVER/
–+
2X 1/2 FEMALE
NPT CONDUIT
CONNECTION
3/4 MALE
NPT PROCESS
CONNECTION
3-19/32
[91.28]
9/16
[14.29]
4-1/2
[114.30]
“L”
2X 3/4 [19.05]
CLEARANCE FOR
COVER REMOVAL
4-3/16
[106.36]
2X 1/2 FEMALE NPT
CONDUIT CONNECTION
4-7/16
[112.7]
2-3/8 [60.3]
2-3/4
[70.0]
3-1/4
[82.6]
MOUNTING
BRACKET
1-3/8 [34.9]
Remote Mount Housing
3/4 MALE NPT
CONNECTION
120
[3048]
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
CRF2 -W 1TR -048Ø -M20
SERIES
CRF2 - Capacitive level transmitter
6
[152.4]
PROCESS
3-5/32
[80.2]
“L”
SUPPLY
+
READOUT
–
ZERO/
4-MA
SPAN/
20-MA
OUTPUT
OPTIONS
M20 - M20 conduit
connection with gland
ENCLOSURE
W - Weatherproof
R - Remote mount weatherproof housing
PROBE LENGTH
XXX - Insertion length in inches.
Example 048 is 48 length. Rod
type min: 24 , max: 144 ; Cable
PROBE TYPE
R - Rod
C - Cable
type min: 24 , max: 360˝
PROCESS CONNECTION
1T - 3/4 NPT male
2T - 1 NPT male
GROUND
Ø - None Included
A - Attached ground rod
(3˝ or 4˝ ange process
connection types only)
U - Unattached ground rod
3T - 1-1/2 NPT male
1B - 3/4 BSPT
2B – 1 BSPT
3B – 1-1/2 BSPT
1S – 1 sanitary clamp
2S – 1-1/2 sanitary clamp
3S – 2 sanitary clamp
1F – 2 150# ange, 316 SS
2F – 2 150# ange, PVC
3F – 3 150# ange, 316 SS
4F – 3 150# ange, PVC
5F – 4 150# ange, 316 SS
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the
latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
6F – 4 150# ange, PVC
DWYER INSTRUMENTS, INC.
T: 219-879-8000 | F: 219-872-9057 | [email protected]
dwyer-inst.com
800-872-9141
DS-CRF2 | 2/17
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