LTW425 2 WIRE LOOP TESTER
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We offer a calibrated version of this product:
UKAS(198441)LTW425 loop testerRSCal(198441)LTW425 loop tester |
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Specifications
| Battery Life | 2000 Tests | |
| Battery Type | AA | |
| Best Loop Test Accuracy | ±10% | |
| Dimensions | 203 x 148 x 78mm | |
| Display Type | LCD | |
| Height | 78mm | |
| Length | 203mm | |
| Loop Impedance Test Type | 2 Wire | |
| Maximum Operating Temperature | +50°C | |
| Maximum Voltage Measurement | 440V | |
| Minimum Operating Temperature | -10°C | |
| Model Number p | LTW425 | |
| Non-Trip Loop Test | Yes | |
| Power Source | Battery | |
| RCD Test Current | 4A | |
| RCD Test Type | AC Selective | |
| Safety Category | CAT IV 300 V, IEC 61010 | |
| Safety Category Level | CAT IV | |
| Safety Category Voltage | 300V | |
| Weight | 1000g | |
| Width | 148mm |
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LTW425
The Megger LTW425 two wire earth loop tester verifies the loop impedance of a live electrical circuit, ie without the need to disconnect the electrical supply. Offers a high resolution 2-wire loop testing solution that does not trip 30 mA RCDs and can be used on a wide range of voltages.
High resolution (0.001Ω) 2 wire testing + maxZ + (R1+R2)
Backlit display
2 wire loop tests: Phase to Earth, Phase to Neutral or Phase to Phase
3 phase circuits with RCD protection can be tested
Tests radial circuits where the circuit does not return to the origin, even where only a phase and neutral contacts are available.
10 second non trip loop test time with Auto test extension up to a further 10 seconds if noise is detected, to improve the accuracy of the test
High current loop testing for supplies that do not have an RCD fitted
AUTO START will start the loop test running as soon as the test leads are connected; No need to press the test button means much safer testing
PFC Display up to 40kA
Voltage and frequency measurement
110 Vac systems including 110V centre tap to earth (55 V phase to earth) can be tested on the secondary winding.
IP54 Weatherproof case
Optional 10A fused 2 wired test leads and crocodile clip set
Complies with IEC61010-1 300V CATIV safety standard and meets EN61557
| Voltage measurement | |
| (ac only) | 50V to 440V |
| Accuracy | ±2% ±1V |
| Range | 25Hz to 99.99Hz |
| Accuracy | ±0.1Hz |
| A warning will be shown if applied voltage exceeds 440V Damage will occur if applied voltage exceeds 600Vrms |
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| Loop testing | |
| No-trip loop and high current loop test | |
| Source voltage | 50V to 440V (50Hz) |
| Display range | 0.01Ω to 2000Ω |
| Accuracy | ±5% ±0.03Ω |
| Nominal test current | No-Trip loop test 15 mA (at nominal 230Vac supply) High current loop test 4 A (at nominal 230 Vac supply) |
| Operational range | 0.30Ω to 1000Ω |
| High resolution loop test | |
| Source voltage | 50 V to 440 V (50Hz) |
| Display range | 0.001Ω to 2000Ω |
| Accuracy | ±5% ±0.01Ω |
| Nominal test current | 4A at nominal 230V supply |
| Operational range | 0.30Ω to 1000Ω |
| Prospective Fault Current (PFC) | |
| Prospective fault current | Measured Source Voltage / Loop resistance |
| Maximum range | 40 kA; accuracy is derived from loop test and voltage measurement. |
| Safety | |
| EN61010 | Designed to EN61010-1 ed2 2001-02 Designed for 300 volts to Earth Category IV, with Phase to Phase voltages to 440 Volts; Fuse protected to 600 volts rms ac |
| EN61557 | Complies with the following parts of EN61557, Electrical safety in low voltage systems up to 1000V ac and 1500V dc- Equipment for testing, measuring or monitoring of protective measures: Part1-General Requirements; Part3-Loop resistance |
| Power supply | |
| Battery | 8 x 1.5V cells IEC LR6 type (AA alkaline) |
| Rechargeable | 8 x 1.2V NiCd or NiMH cells |
| Battery life | 2000 consecutive tests |
| Mechanical | |
| Weight | 1000g ±10% excluding test leads |
| Dimensions | 203 x 148 x 78 mm |
Note
RS is an authorised Megger distributor. Purchased though RS this product is eligible for the Megger extended 3 Year warranty
Supplied with
Test lead set with crocodile clips, mains socket test lead, 8 AA alkaline batteries, hard carry case and instructions.