Hioki FT6031-50 IP67 Earth Resistance Tester

Name: Hioki FT6031-50 IP67 Earth Resistance Tester – Brochure & Quote
Brand: Hioki
SKU: FT6031-50

A field-tough earth tester that checks itself before measuring

The Hioki FT6031-50 is an earth resistance tester for fall-of-potential measurements with auxiliary earthing rods, built for outdoor work. It carries IP67 protection even with the terminal caps open (the specifications list IP65/IP67), is drop-proof from 1 m onto concrete with its protector attached, and has a vibration-resistant design and a large LCD with a wide viewing angle.

Pressing MEASURE starts an automatic sequence. The tester first checks the measurement cables for line breaks and checks the disturbance voltage (noise), then checks the auxiliary earthing electrodes, and finally measures the earth resistance in auto-range, showing a warning if a check fails so that the technician can decide quickly what to fix. Accuracy is +/-1.5 % rdg. +/-8 dgt. on the 20 ohm range, a zero-adjustment function cancels wiring resistance on long cable runs, and the tolerance for the resistance of the auxiliary earthing electrodes is ten times higher than before, so a single insertion of the rods is usually enough even in dry soil.

Two or three-electrode measurement can be chosen, with automatic internal switching of connections so no short bar is needed. Three-electrode measurement is the standard method with the rods placed in a straight line about 5 to 10 m apart; the two-electrode method can measure Class D ground by using the Class B ground of a pole-mounted transformer, in which case the value includes the Class B resistance.

Technical specifications

Parameter	Specification
Measurement method	Two-electrode and three-electrode, switchable
Ranges (auto)	20 ohm (0 to 20.00 ohm), 200 ohm (0 to 200.0 ohm), 2000 ohm (0 to 2000 ohm)
Accuracy	+/-1.5 % rdg. +/-8 dgt. (20 ohm range, 2-electrode); +/-1.5 % rdg. +/-4 dgt. (200 and 2000 ohm)
Measuring frequency / current	128 Hz +/-2 Hz; 25 mA rms or less (3-electrode), 4 mA rms or less (2-electrode)
Measuring time	Within 6 s (3-electrode, including checks); within 3 s (2-electrode)
Auxiliary electrode tolerance	20 ohm range 5 kOhm; 200 ohm and 2000 ohm ranges 50 kOhm
Earth potential	0 to 30.0 V rms; allowable 25.0 V rms
Functions	Live wire warning, zero adjustment, continuous measurement, comparator, wireless with Z3210
Protection / drop	IP65/IP67 (EN 60529); 1 m drop onto concrete with protector
Max. rated voltage to earth	100 V AC/DC (CAT IV), 150 V (CAT III), 300 V (CAT II)
Operating temperature	-25 to 65 degC with humidity derating
Power supply	4 x LR6 alkaline; about 500 measurements on new batteries
Standards	Safety EN 61010; EMC EN 61326; earth tester EN 61557
Dimensions / mass	185 W x 111 H x 44 D mm; 570 g including batteries and protector

What is in the set and how it is used

The standard accessories are the L9840 stainless-steel auxiliary earthing rods (2 pieces, 270 mm), a 4 m black measurement cable with alligator clip (L9841), a 10 m yellow cable with winder (L9842-11), a 20 m red cable with winder (L9842-22), a carrying case, a protector, four LR6 batteries and the manual. The winders let a 20 m cord be rewound about twice as quickly as a conventional reel and keep it free of tangles. Options include 50 m cables with flat cable winder (L9843-51, -52), a simplified-method test lead L9787, earth nets and the carrying case C0106.

The FT6031-90 is a set of the FT6031-50 and the Bluetooth Wireless Adapter Z3210, which sends measurements to a smartphone or tablet for report creation with site photos and drawings in GENNECT Cross.

What to confirm before ordering

Choose between the FT6031-50 and the FT6031-90 set, and decide on cable lengths: 10 m and 20 m cables are standard but large electrode systems may need the 50 m options. Confirm the earthing standard you test against, the soil conditions for the auxiliary rods, and whether your procedure needs a certificate. For stakeless testing of multi-grounded systems, the clamp-type FT6380-50 is the matching tool.

Documents and quotation

The attached Hioki document is the FT6031-50 catalog in English. A comparable spike-type instrument is the Megger DET4T2 four-terminal earth ground resistance tester; the portable test and measurement category lists other instruments. Send the order code, cable lengths and quantity for a quotation from Seven Star LLC.

Hioki instruments listed on this page

Insulation testers: IR4056-20 (1000 V, five ranges) and IR5050 (5 kV with PI, DAR and DD).

Earth testers: FT6031-50, FT6041 and the clamp-on FT6380-50.

Clamp meters: CM4375-50 (1000 A AC/DC) and CM4141-50 (2000 A AC).

Loggers and analyzers: PW3360-20 clamp-on power logger and PQ3198 Class A power quality analyzer.

Resistance meters: RM3548-50 handheld four-wire meter.

Ordering Hioki instruments: what we need

Send the full order code, because Hioki uses suffixes to separate versions, for example sets with wireless adapters or different leads. Name the accessories you need, such as test leads, clamps, current sensors, the Z3210 wireless adapter and carrying cases, and say if a calibration certificate is required. If the model is uncertain, describe the circuit, the voltage and the quantity to be measured.

Frequently Asked Questions