The contact amplifier (switching amplifier) serves preferably the protection of weak sensor contacts or the amplification of binary sensor signals. The AD-KVEX 100/200 GVD provides a logical input signal amplified at a contact output. Typical input signals are reed contacts, signal sensor according to Namur Namur (DIN EN 60947-5-6) or resistance changes. At the output, heavy-duty and potential free contacts are provided. The logical switching direction as well as the line fault recognition is separately switchable for each conduit. The version AD-KVEX 100/200 GVDO has wear-free semi-conductor outputs, which are also galvanically separated via an optic isolation. The device contains an electronic wide range power supply and can operate in a wide supply voltage range.



Pulse recording of water meters or flow monitors for counting through-flow quantities. Amplification and contact protection of weak sensor signals (reed contacts, limit switches, etc.), switching signal transmission in control circuits, switching amplifier for inductive and capacitive proximity switches according to Namur (DIN EN 60947-5-6).

Specific characteristics

  • Intrinsically safe input [Ex ia] IIC
  • Up to two independent switching channels (AD-KVEX 200)
  • Switching function can be reversed
  • Line fault detection
  • LEDs for signal and error display
  • Wide range power supply
  • Optional version with semiconductor output
  • Optional available with Ex input terminal at the bottom
    (order option: S-488)

Business data

Order number
AD-KVEX 100 GVD 1 relay output
AD-KVEX 100 GVD-O 1 semiconductor output
AD-KVEX 200 GVD 2 relay outputs
AD-KVEX 200 GVD-O 2 semiconductor outputs
Ex input terminals below Special order type S-488
EClass 27210121
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-kvex.pdf (354 kB)
Instruction manual pdf man-kvex-ad-en.pdf (2 MB)
Tender text zip (74 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Signal input
Min. pulse width 100 ms
Namur supply voltage Ca. 8,2 V DC +/-3%
Logic level, Low < 1,6 mA
Logic level, High > 1,9 mA
Wire breakage detection < 0,2 mA
Short circuit detection > 7,8 mA
Signal types Initiator DIN EN 60947-5-6, contact, transistor
Contact output
Maximum switching load AC 250 V, 2 A
Maximum switching load DC 50 V, 2 A
Contact construction Potential-free changeover
Switching operations mechanical 1 x 10 7
At 230V/2A AC, cos(phi)=1 6 x 10 5
At 230V/2A AC, cos(phi)=0,4 2 x 10 5
At 50V/2 A DC 2 x 10 5
Semiconductor output
Max switching voltage 30 V DC
Max. switching current 50 mA DC
Voltage range AC 50 ... 250 V AC, 50/60 Hz
Nominal voltage AC 230 V AC
Power consumption AC 3,5 VA (2,3 VA ; KVEX 100 GVD)
Voltage range DC 20 ... 120 V DC
Nominal voltage DC 24 V DC
Power consumption DC 1,8 W (1W ; KVEX 100 GVD)
Transmission behaviour
Response time ~ 100 ms
Dimensions (WxHxD) 23 x 110 x 134 mm
Type of protection IP 20
Connection method Detachable terminal clamp
Terminals, wire cross section 2,5 mm² flex wire / 4 mm² one wire
Bolting torque terminals 0,5 Nm
Weight ~ 115 g
Manner of fastening 35 mm DIN rail 35mm (EN50022)
Environmental conditions
Ambient temperature -20 ... +60 °C
Storage and transport -20 ... +70 °C (no condensation)
ATEX II(1) G [Ex ia Ga] IIC
II(1) D [Ex ia Da] IIIC
EU-Type Examination Certificate BVS 16 ATEX E 038 X
Safety Specifications per channel
Voltage Uo 9,56 V DC
Current Io 10,62 mA DC
Power Po 25,4 mW
Max. external capacitance Co
||B |||C
3,6 µF
26 µF
210 µF
Max. external inductance Lo
||B |||C
315 mH
1261 mH
2522 mH
Max. external inductance / resistance ratio Lo/Ro
||B |||C
1,41 mH/Ohm
5,65 mH/Ohm
11,3 mH/Ohm
Internal capacitance Ci N/A
Internal inductance Li N/A
Safety Specifications 2 channels parallel
Voltage Uo 9,56 V DC
Current Io 21,24 mA DC
Power Po 50,8 mW
Max. external capacitance Co
||B |||C
3,6 µF
26 µF
210 µF
Max. external inductance Lo
||B |||C
78,8 mH
315,25 mH
630,5 mH
Max. external inductance / resistance ratio Lo/Ro
||B |||C
0,706 mH/Ohm
2,826 mH/Ohm
5,565 mH/Ohm
Internal capacitance Ci N/A
Internal inductance Li N/A
Product family standard EN 61326-1 1)
Emitted interference EN 55011, CISPR11 Cl. B, Gr. 1
Electrical safety requirements
Product family standard EN 61010-1
Overvoltage category II
Pollution degree 2
Galvanic isolation, test voltages
Input / output 3 kV, 50 Hz (1 min.)
Signal / supply unit 3 kV, 50 Hz (1 min.)
Protection circuits
Input Electrical surge protection
Power supply Protection against over voltage, over temperature and reverse polarity
1) During checking, slight signal deviations are possible.

Block and wiring diagram




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