Switching unit for conductive sensors
Nivotester FTW325
Info-Hotline
00385 1 6591 780
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Easy wiring with terminal blocks
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Configurable sensitivity range
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Intrinsically safe signal circuit EEx ia IIC for using sensors in
hazardous areas
Specs at a glance
Function Switching unit Product Liquids ≥ 5 µS/cm Approval ATEX II (1) GD EEx ia Feeding sensors Conductive rod or rope sensors Product / Version Price / pcs. in HRK Order code Power Supply Approval 1 to 3 4 to 10 11+ 85-253VAC Non-hazardous area 935.- 870.- 823.- FTW325-A2A1A Non-hazardous area, WHG 1,054.- 980.- 927.- FTW325-B2A1A ATEX II (1) G [Ex ia Ga] IIC, WHG ATEX II (1) D [Ex ia Da] IIIC, WHG 1,168.- 1,086.- 1,028.- FTW325-C2A1A 20-30VAC/20-60VDC Non-hazardous area 935.- 870.- 823.- FTW325-A2B1A Non-hazardous area, WHG 1,054.- 980.- 927.- FTW325-B2B1A ATEX II (1) G [Ex ia Ga] IIC, WHG ATEX II (1) D [Ex ia Da] IIIC, WHG 1,168.- 1,086.- 1,028.- FTW325-C2B1A Accessory
Product / Version Price / pcs. in HRK Order code Housing Field, R4 182x180x165, 5xM20, PC Protection housing Minitec. Synthetic housing with transparent cover. Protection IP66. 4x22.5mm / 2x45mm. Usage: FTL825. 569.70 52010132 Prices valid until 30.06.2020 in EUR per unit (not including shipping and applicable sales tax). See
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Application
The Nivotester FTW325 can be used for overspill protection (WHG), pump dry running protection or as a two-point control for pumps. Sensors such as the Liquipoint T FTW31/FTW32 can be connected to the FTW325. Multipoint detection for up to five measuring points is possible by using 3 Nivotester FTW325s.
Function
The intrinsically safe signal input of the limit switch Nivotester FTW325 is galvanically isolated from the mains and the output. The Nivotester supplies the conductivity probes with an alternating current via a two or three-wire line and monitors its voltage. If the product reaches the switch point of the probe, the voltage between the probe and Nivotester is reduced. The output relays at the Nivotester switch depending on the set failsafe mode. Two yellow LEDs on the front panel of the Nivotester indicate the relay switch status.
Application Example
a) FTW325 - Probe rod1
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Technical data
InputMeasured variable Depending on the setting selected, the limit signal is triggered at a minimum or maximum level Measuring range Three resistance ranges can be set with DIL switches; 0.1 to 1.0 kΩ; 1.0 to 10.0 kΩ; 10.0 to 200.0 kΩ Input signal Input galvanically isolated from power supply and output Type of protection [EEx ia] IIC OutputOutput signal Relay output: one floating changeover contact for the level alarm Alarm relay Floating changeover contact for fault reporting, can be switched as second level relay Switching delay 0.5 s; 2.0 s; 6.0 s when relay energized Switching power of relay contacts U~ max. 253 V;
I~ max. 2 A;
P~ max. 500 VA at cos φ ≥ 0.7;U– max. 40 V;
I– max. 2 A;
P– max. 80 WFunction indicators Light emitting diodes for operation (gn), fault (rd), level alarm 1 (ye) and level alarm 2 (ye) light up when level relay is energized Power supplySupply voltage 85 to 253 V AC, 50/60 Hz;
20 to 30 V AC / 20 to 60 V DC, max. 60 mA
Power consumption AC-version maximum 4.5 VA
DC-version maximum 1.2 VA (at Umin 20 V)
Operating conditionsAmbient temperature For individual mounting -20 to +60 °C for series mounting without lateral spacing -20 to +50 °C (-4 to +122 °F) Storage temperature –25 to +85 °C (–13 to +185 °F) (preferably at +20 °C/+68 °F) Installation in protective housing –20 to +40 °C (–4 to +104 °F) Ingress Protection IP 20 EMC Interference emission to EN 61326; electrical equipment Class B; interference immunity to EN 61326; Annex A (industrial) and NAMUR recommendation NE 21 (EMC) Electrical connectionConnection line two core, screening not required Line resistance max. 25 Ω per core Cross-section max. 1×2.5 mm² or 2×1.5 mm² ApprovalsEx approval ATEX II (1) GD [EEx ia] IIC WHG approval Overspill protection to §19 WHG (Germany) Dimensions (in mm)
Mounting on DIN rail (EN 60715 TH35)
Installation according to instruction manual
Electrical connection
a) MASTER/SLAVE
b) Power supply
c) Level relay 2/Alarm relay
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