Serviceline Industrial Sensors
Serviceline Explosion Protection

Strain Gauge Converter KFD2-WAC2-1.D

  • 1-channel signal conditioner
  • 24 V DC supply (Power Rail)
  • Strain gauge input (full or half bridge)
  • Output 0 mA ... ± 20 mA or 0 V ... ± 10 V
  • 2 relay contact outputs
  • Programmable high/low alarm
  • Configurable by PACTware or keypad
  • RS-485 interface
  • Line fault detection (LFD)

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH, also apply to Pepperl+Fuchs AG.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  KFD2-WAC2-1.D

Product Description
24 V DC
General specifications
Signal typeAnalog input
ConnectionPower Rail or terminals 23+, 24-
Rated voltage20 ... 35 V DC
Ripplewithin the supply tolerance
Power consumptionmax. 3 W
ConnectionPower Rail or terminals 19+, 20 GND, 21-
Programming interfaceprogramming socket
Field circuit
Connectionterminals 1+, 2-, 3+, 4-, 5+, 6-
Lead resistancemax. 25 Ω per line
Input I
Connectionterminals 1+, 2-
Sensor supply1 ... 5 V
Connectionterminals 3+, 4- (supply); 5+, 6- (signal)
Short-circuit current50 mA
Load≥ 116 Ω up to 5V, ≥ 85 Ω up to 4V
Connection sidefield side
ConnectionInput I: terminals 1+, 2-; Input II: terminals 13+, 14-; Input III: terminals 15+, 14-
Programmable Tare0 ... 500 % of span
Input ISignal, analog
Input signal-100 ... 100 mV
Input resistance> 1 MΩ for voltage measurement
Input II, IIItare adjustment, calibration and zero
Open circuit voltage/short-circuit current18 V / 5 mA
Active/PassiveI > 4 mA/I < 1.5 mA
Connection sidecontrol side
ConnectionOutput I: terminals 10, 11, 12; Output II: terminals 16, 17, 18; Output III: terminals 7-, 8+, 9-
Output I, IIRelay output
Contact loading253 V AC/2 A/500 VA/cos φ min. 0.7; 40 V DC/2 A resistive load
Mechanical life2 x 107 switching cycles
Output IIIAnalog output
Current range-20 ... 20 mA
Loadmax. 550 Ω
Analog voltage output0 ... ± 10 V; output resistance 500 Ω (bridge between terminal 7 and 9)
Analog current output0 ... ± 20 mA or 4 ... 20 mA; load 0 ... 550 Ω (terminals 7 and 8)
Line fault detectiondownscale -21.5 mA (-10.75 V) or 2 mA (1 V), upscale 21.5 mA (10.75 V)
Collective error messagePower Rail
Transfer characteristics
Resolution/accuracy≤ ± 0.05 % incl. non-linearity and hysteresis
Temperature effect ≤ ± 0.01 %/K
Reaction time300 ... 850 ms
Galvanic isolation
Input I/other circuitsreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output I, II against eachotherreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output I, II/other circuitsreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output III/Input II, IIInot available
Output III/Programming socketnot available
Other circuits from each otherfunctional insulation, rated insulation voltage 50 Veff
Display elementsLEDs , display
Control elementsControl panel
Configurationvia operating buttons
via PACTware
Labelingspace for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2004/108/ECEN 61326-1:2006
Low voltage
Directive 2006/95/ECEN 61010-1:2010
Electromagnetic compatibilityNE 21:2006
Degree of protectionIEC 60529:2001
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 250 g
Dimensions40 x 119 x 115 mm (1.6 x 4.7 x 4.5 inch) , housing type C3
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
International approvals
UL approvalE223772
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see

Approvals+Certificates: KFD2-WAC2-1.D

CertificatesCertificate No.File TypeFile Size
Belarus Pattern ApprovalNr. 11709PDF15640 KB
CA ULE223772 cUL (NRAQ7)LINK---
Russia VNIIMS Pattern ApprovalOC.C.34.004.A No.56757PDF6680 KB

Software: KFD2-WAC2-1.D

Device type managersRelease InfoFile TypeFile Size
DTM Collection Interface Technology 2 / DTM Collection Interface Technology KB
Software Tools
PACTware 4.1 SP5 / PACTware 4.1 SP54.1.0.52ZIP50675 KB
PACTware 5.0 / PACTware KB

Associated Products: KFD2-WAC2-1.D

Device DTM, For K-, E- and H-System, Frame application, like e. g. PACTware, must be installed separatelypa
Universal DTM host platform, For all DTMs of Pepperl+Fuchs, Approved FDT/DTM technology, Free of charge, Download from Pepperl+Fuchs websitepa

Function: KFD2-WAC2-1.D

This signal conditioner provides the galvanic isolation between field circuits and control circuits.

The device is used with strain gauges, load cells and resistance measuring bridges.

Designed to provide 5 V excitation voltage, this barrier’s high quality A/D converter allows it to be used with those devices requiring 10 V.

Up to four 350 Ω strain gauges connected in parallel may be powered and evaluated.

The device is easily configured by the use of keypad or with the PACTware configuration software.

The current measurement for tare, zero point, and final value can be entered in this manner.

A fault is signalized by LEDs and a separate collective error message output.

For additional information, refer to the manual and