13. Technical specification
13.1 General specification
Only values with tolerances or limits are guaranteed data. Values without tolerances are for information only.
Accuracy;
All accuracy statements are based on:
Ambient temperature: 23ºC ± 2ºC
Nominal source voltage: 230 V a.c ± 1%
Voltage measurement.
(a.c only) 50 V to 440 V
Accuracy: ±2% ±1 V
Frequency measurement
Range: 25 Hz to 99.99 Hz
Accuracy: ±0.1 Hz
Loop testing
NO-TRIP loop and high current loop test (LTW315)
Source voltage: 100 V to 280 V (50 Hz)
Display range: 0.01 Ω to 2000 Ω
Accuracy: ±5% ±0.03 Ω @ 230 V a.c. ±10% ±0,03 Ω @ 100 V a.c. and 280 V a.c.
NO-TRIP loop and high current loop test (LTW325, LTW335 and LTW425)
Source voltage: 50 V to 440 V (50 Hz)
Display range: 0.01 Ω to 2000 Ω
Accuracy: ±5% ±0.03 Ω @ 230 V a.c.
±10% ±0.03 Ω @ 100 V a.c. and 300 V a.c. (LTW325 and LTW425)
±10 ±0.02 Ω (LTW425)
±15% ±0.03 Ω @ 50 V a.c. (LTW325, LTW335 and LTW425)
Nominal test current:
No-Trip loop test 15 mA at nominal 230 V a.c supply
High current loop test 4 A at nominal 230 V a.c supply
EN61557 operational range: 0.30 Ω to 1000 Ω
High resolution loop test (LTW425 only)
Source voltage: 50 V to 440 V (50Hz)
Display range: 0.001 Ω to 2000 Ω
Accuracy: ±5% ±0.01 Ω
Nominal test current: 4 A at nominal 230 V supply
EN61557 operational range: 0.300 Ω to 1000 Ω
Prospective Fault Current (PFC)
Prospective fault current = Measured voltage / Loop resistance
Maximum range: No Trip mode: 20 KA
High current mode: 20 KA
Hi resolution mode: 40 KA
Accuracy is derived from loop test and voltage measurement.
Environmental
Temperature and humidity
Operating Range: -10°C to +60°C
Operating Humidity: 90% R.H. non-condensing at +40°C max.
Storage Range: -25°C to +70°C
Maximum altitude: 2000m to full safety specification
Dust and water ingress: IP54
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