NAMUR isolating amplifier
Nivotester FTL325N
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+45 70 131 132
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NAMUR interface IEC EN 60947-5-6
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One- to three-channel version
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Two-point control and point level detection with vibronic point level switch Liquiphant M/S, Soliphant
M, Solicap M/S, Liquicap M and Liquipoint
Specs at a glance
Function Isolating amplifier Approval ATEX II (1) GD EEx ia Connectable sensors All NAMUR switches Output 1 relay per channel Number of channels 1 or 3 Product / Version Price / pcs. in DKK Order code Power Supply Switch Output 1 to 3 4 to 10 11+ 85-253VAC 1x SPDT level + 1x SPST alarm 800,- 720,- 656,- FTL325N-F1A1 3x SPDT level + 1x SPST alarm 1.458,- 1.312,- 1.196,- FTL325N-F3A3 20-30VAC/20-60VDC 1x SPDT level + 1x SPST alarm 800,- 720,- 656,- FTL325N-F1E1 3x SPDT level + 1x SPST alarm 1.458,- 1.312,- 1.196,- FTL325N-F3E3 Accessory
Product / Version Price / pcs. in DKK Order code Housing Field, R4 182x180x165, 5xM20, PC Protection housing Minitec. Synthetic housing with transparent cover. Protection IP66. 4x22.5mm / 2x45mm. Usage: FTL825. 543,46 52010132 Prices valid until 31.12.2018 in DKK per unit (not including shipping and applicable sales tax). See
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Application
The isolating amplifier Nivotester isolates and amplifies signals coming from hazardous areas. Proximity switches, vibronic point level switches or mechanic contacts can be used as measuring sensors. Isolating amplifiers can be used for the transmission of the switch status or for limit detection. Two-point control is possible in a liquid tank using the three-channel version. Combined with a Liquiphant M or Liquiphant S the isolating amplifiers are approved as overspill protection according to WHG. For using FTL325N in field a protection housing is available.
Function
The isolating amplifiers supply voltage to the measuring sensors via a two-wire loop. The switching status of the sensors is evaluated and put out via a relay. By using the quiescent-current-principle this ensures a high operational safety. At the same time, a control current is transferred along this supply line. Combined with a vibronic point level switch Liquiphant M/S and Soliphant M the measuring line is controlled of short-cut, supply fails also the vibration fork of corrosion.
Application Example
When channels CH2 and CH3 are used for two-point control Δs, the measuring device consists of:
- 2 measuring sensors
- 3-channel Nivotester
- control or signal devices
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Technical data
InputMeasured variable The limit signal can be triggered at minimum or maximum height as required Measuring range The measuring range is dependent on the installation location of the sensors Input Galvanically isolated from power supply and output Protection type II(1)G [Ex ia Ga] IIC
II(1)D [Ex ia Da] IIICConnectable measuring sensors Liquiphant M, Liquiphant S, Soliphant M, Solicap M, Solicap S, Liquicap M; sensors specified to IEC/EN 60947-5-6; contact switches with an appropriate resistance circuit Connecting line two-wire, screening unnecessary Line resistance max. 25 Ω per wire Signal transmission Current signal on supply line Control current range <1.2 mA / >2.1 mA Line interruption monitoring <200 µA Short-circuit >6.1 mA (can be switched off) OutputRelay output One potential-free switch contact for the level alarm per channel Quiescent current
fail-safe modeMIN/MAX safety can be selected with DIL switch Switch delay approx. 0.5 s Switching power of the 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 W
Life at least 105 switching operations at maximum contact load Function displays LEDs for operation, level alarm and fault Power supplySupply voltage 85 to 253 V AC, 50/60 Hz
20 to 30 V AC, 20 to 60 V DC, max. 60 mA (1-channel), max. 113 mA (3-channel),
permissible residual ripple within tolerance: Vpp = max. 2 V
The Nivotester is equipped with reverse polarity protection.
Power consumption AC:
1-channel: max. 1.75 W
3-channel: max. 2.75 WDC:
1-channel: max. 1.2 W (at Vmin 20 V)
3-channel: max. 2.25 W (at Vmin 20 V)Operating conditionsAmbient temperature For single installation: –20 to +60 °C (–4 to +140 °F)
for rail mounting without gaps: –20 to +50 °C (–4 to +122 °F)
Storage temperature –20 to +85 °C (–4 to +185 °F) (preferably at +20 °C/+68 °F) Ingress Protection IP20, IK06 EMC Interference emission to EN 61326; Class A apparatus; interference immunity to EN 61326; Appendix A (Industry) and NAMUR Recommendation NE 21 (EMC) MaterialsHousing Polycarbonate Front cover PP polypropylene Fixing slide (for fixing to top-hat rail), Polyamide PA6 ApprovalsEx approval II(1)G [Ex ia Ga] IIC
II(1)D [Ex ia Da] IIICOverfill prevention WHG, leak approval Dimensions (in mm)
Installation according to instruction manualElectrical connection
1-channel version
Connection cross section max. 1 × 2.5 mm² or 2 × 1.5 mm²
a) Sensor 1 (EEx ia)
b) Limit value relay 1
c) Power supply
d) Alarm relay
3-channel version
Connection cross section max. 1 × 2.5 mm² or 2 × 1.5 mm²
a) Sensor 1 (EEx ia)
b) Limit value relay 1
c) Power supply
d) Alarm relay
e) Sensor 3 (EEx ia)
f) Sensor 2 (EEx ia)
g) Limit value relay 2
h) Limit value relay 3
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