25
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
