Proceq Resipod Concrete Resistivity Meter

Name: Proceq Resipod Concrete Resistivity Meter | Seven Star LLC
Brand: Proceq
SKU: Resipod

A four-point resistivity meter for judging corrosion risk and concrete quality

The Resipod measures the electrical resistivity of concrete at the surface. It works on the Wenner principle: a current is injected through the two outer probes and the potential is read across the two inner probes, so that resistivity is calculated as 2 pi times probe spacing times voltage divided by current and displayed in kOhm-cm. Resistivity is a way of judging how easily chloride-bearing water and current can move through the concrete, which is why it is used alongside half-cell and cover measurements.

The meter is one hand-held body of 197 x 53 x 69.7 mm and 318 g with four probes at a spacing of 50 mm or 38 mm (1.5 inch). It measures from 1 to about 1000 kOhm-cm with an accuracy of plus or minus 0.2 kOhm-cm or 1 %, whichever is greater, in the 200 uA range. A pixel LCD shows the result, a current indicator warns of poor contact and 500 values can be stored and sent to a PC through USB.

Design highlights

Wenner four-point measurement of surface resistivity
Probe spacing 50 mm or 38 mm (1.5 inch)
Current flow indication and poor-contact warning
Hold, save and delete functions with memory for about 500 values
ResipodLink PC software with variable contact spacing
Bulk resistivity and geometric accessory versions
More than 50 hours of autonomy

Technical specifications

Parameter	Specification
Principle	Wenner four-point resistivity, rho = 2 pi a V / I
Measured quantity	Electrical resistivity in kOhm-cm
Measurement range	1 kOhm-cm to about 1000 kOhm-cm, depending on probe spacing
Accuracy at 200 uA	+/- 0.2 kOhm-cm or +/- 1 %, whichever is greater
Accuracy at 50 uA	+/- 0.3 kOhm-cm or +/- 2 %, whichever is greater
Accuracy below 50 uA	+/- 2 kOhm-cm or +/- 5 %, whichever is greater
Measuring frequency	40 Hz
Probe spacing	50 mm (standard) or 38 mm (1.5 inch)
Display	Pixel graphic LCD with current and battery indication
Memory	Non-volatile, about 500 measured values
Connection	USB type B, 5 V, 100 mA
Autonomy	More than 50 hours
Dimensions / weight	197 x 53 x 69.7 mm / 318 g
Operating temperature	0 to 50°C
Storage temperature	-10 to 70°C
Warranty	24 months electronics, 6 months mechanical

Resipod variants and spare parts

The operating instructions list six complete units; each includes a test strip, foam contact pads, charger with USB cable, software, carrying strap, documentation and case.

Code position	Options
381 10 000	Resipod, 50 mm probe spacing
381 20 000	Resipod, 38 mm (1.5 inch) probe spacing
381 30 000 / 381 40 000	Resipod Bulk Resistivity, 50 mm or 38 mm, with the bulk resistivity accessory
381 50 000 / 381 60 000	Resipod Geometric, 50 mm or 38 mm, with the geometric accessory
Accessories	Variable spacing probe 381 01 094; Resipod stand 381 01 089; replacement foam pads 381 01 043 S; bulk contact pads 381 01 092 S; test strip 381 01 038

Installation and operating notes

Moisten the foam contact pads, press the four probes onto the cleaned surface and read when the current indicator shows a stable value. The range indicator shows whether the 200 uA or the 10 to 50 uA range is active.

Reinforcement affects the reading. The manual recommends keeping bars out of the direct line under the probe and, where rebar spacing allows, taking readings across the bars with a probe span of 3 times the spacing, which is 150 mm for the 50 mm model and 114 mm for the 38 mm model. Where the bars are too close, take several readings and move the probe a few mm between them.

Record the concrete temperature. The manual notes that resistivity falls as temperature rises, by about 3 % per degree Celsius for saturated concrete and 5 % for dry concrete, and that moisture state, carbonation and aggregate size also matter. Check the instrument with the supplied test strip, which gives 16 kOhm-cm for the 50 mm model and 12 kOhm-cm for the 38 mm model in the upper row.

Durability assessment of concrete structures

Resistivity mapping is used on bridge decks, car parks, jetties, tunnels and coastal buildings to find zones where reinforcement corrosion is likely to be active or where concrete is of low density. In the hot, saline conditions of the Gulf the readings help to prioritise coring and half-cell testing.

Interpreting the numbers needs reference values and the moisture condition of the structure, which the manual leaves to the engineer. The meter does not give a corrosion rate on its own. General guidance.

Information to send with an RFQ for the Proceq Resipod

Send these details to quote the correct Resipod.

Probe spacing, 50 mm or 38 mm
Standard, bulk resistivity or geometric version
Variable spacing probe, stand and spare pads
Calibration certificate requirement

Calibration and field notes

Concrete resistivity is relevant in the region because many structures are exposed to chlorides from seawater, saline groundwater and salty soil, which drive reinforcement corrosion. Surface resistivity surveys help engineers judge the corrosion risk and the quality of concrete in bridges, marine structures, car parks and foundations. Wet the probes and the concrete surface as described in the manual, and avoid taking readings directly over reinforcement bars, which can lower the readings.

Check the instrument with the supplied test strip before each series of measurements, and record the results.

Record the moisture condition of the concrete with each survey, because resistivity depends strongly on moisture, and compare results only between surveys made under similar conditions. Clean the probes after use and store the instrument in its case.

Frequently asked questions

What does the Resipod measure?

The electrical resistivity of concrete in kOhm-cm, using the Wenner four-point principle.

What probe spacings are offered?

50 mm and 38 mm (1.5 inch).

What measuring range applies?

1 kOhm-cm to about 1000 kOhm-cm depending on probe spacing.

How much data can it store?

About 500 measured values in non-volatile memory.

How is it powered?

By a rechargeable battery charged over USB type B, with more than 50 hours of autonomy.

Instruments for concrete and structure assessment

Proceq documentation describes uses such as estimating concrete strength with rebound hammers, mapping rebar cover, testing pile integrity, finding voids and delaminations with ultrasound, measuring concrete resistivity and checking coating adhesion. Many current instruments pair a sensor with an iPad or smartphone app, and the datasheets state ranges, accuracy and applicable standards such as EN 12504 and ASTM C1383.

Frequently Asked Questions