Gesellschaft für Geosystemanalyse

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Die Gerätespezifikationen sind z.Z. noch in englischer Sprache. Die deutsche Version wird in Kürze verfügbar sein.

CPC - Data logger for the determination of the Cathodic Protection




Measurement range : ± 1V, Resolution : < 1mV

Accuracy (linearity, hysteresis, repeatability) : <10mV

Input impedance of the measurement stage : > 10E11 Ohms


CPC ref. 60-07-040/22 : 5 shunts available : 22, 44, 66, 88 or 110 Ohms

CPC ref. 60-07-040/33 : 5 shunts available : 33, 66, 99, 132 or 165 Ohms

Measurement range : 30µA at 10mA, resolution : <3µA

Accuracy (linearity, hysteresis, repeatability) : <50µA

Input impedance of the measurement stage : > 10E11 Ohms


Sampling rate programmable from 0.01s to 99hrs

Memory capacity : 32kb with data compression (64kb optional)

Communication : Electromagnetic transmission without connector, using a reading interface (Data Pencil) connected to a PC serial link.

Energy : 3 Lithium batteries, autonomy > 3 years at 1h sampling rate


Max. operating depth : 300bars

Operating temperature : 0 to +30°C

Length : 274mm

Diameter : 40mm

Weight : 0.950 kg


The CPC allows to define in situ the value of current density needed in order to protect an immersed metallic structure, and thus to define the size and quantity of the sacrificial anodes or the current power supply of the cathodic protection system.
This current density is linked to the environmental parameters (dissolved oxygen, marine current, temperature) which influence the electrochemical reactions on the surface of the structures to be protected.
The CPC comprises one zinc reference electrode, one sacrificial anode and one cathode (the metal to be protected).
The CPC allows the measurement and recording of the difference of potential between the reference electrode and the cathode, as well as the current that circulates between the anode and this same cathode.
Its main specificity comes from the fact that the body of the CPC housing is made with the tested alloy, where the measurement system and the batteries are housed. The CPC is thus compact and without external

SPCT - Corrosion and temperature data logger




Measurement range: -2°C/+30°C.
Maximum resolution: 11m°C at 0°C, 13m°C at 10°C, 20m°C at 20°C
Accuracy: lower than 0.5°C
Sensor: Thermistor
Response time: < 10 minutes at 63%


The voltage measured corresponds to the potential difference between the test point and the zinc reference.
Standard range

Measuring range: -1900mV to +1900mV
Resolution: < 1.5 mV
Accuracy (hysteresis, linearity and repeatability): +/-10mV
High impedance input: > 109 Ω

Reduced range

Measuring range: -100mV to +550mV
Resolution: < 220µV
Accuracy (hysteresis, linearity and repeatability): +/-2mV
High impedance input: > 109 Ω

Optional: Possible range if a silver/silver chloride measuring electrode is used
Mechanical characteristics

Dimensions: length: 165mm, diameter: 35mm.
Materials: Body made of engineered plastic, plug + threaded rod and nut made of Titanium.
Weight in air: approx. 200g
Maximum immersion: 45 bar.


SPCT (Small Potential Corrosion and Temperature) allows the in situ recording of temperature and corrosion potential between a test point (made of an immersed metallic structure) and a zinc reference electrode.

SPC - Cathodic Protection monitoring



One voltage channel for the measurement of the corrosion potential of the structure (in relation to a Zinc reference anode)
Measurement range : ± 1V
Resolution : < 1mV
Accuracy (linearity, hysteresis, repeatability) : <10mV
Input impedance of measurement stage : > 10E11Ohms

One channel for the measurement of the current of cathodic protection
Measurement shunt : 1Ohm
Measurement range : from 30µA to 10mA
Resolution : <3.5µA
Accuracy (linearity, hysteresis, repeatability) : <50µA

Sampling rate programmable from 0.01s to 99hrs
Memory capacity : 32kb with data compression (64kb optional)
Communication interface : inductive transmission, via a Data Pencil connected to a computer.
Energy : 3 Lithium batteries, 1 to 5 years autonomy depending on sampling rate

Maximum depth : 30m
Operating temperature : 0 to +30°C
Dimensions : Length 90mm, Diameter 100mm


The SPC allows to monitor port and offshore structures under cathodic protection.
In order to do this, it records the corrosion potential and the current density received by a coupon (unit of elementary area). The coupon is electrically connected to the structure via the SPC, and is thus a representation of its level of cathodic protection.

SPC4 - Corrosion potential data logger



Measurement characteristics

4 voltage channels to measure the corrosion potential in relation to a reference anode:
measuring range: ±1V
resolution: lower than 1mV
accuracy (hysteresis, linearity and repeatability): lower than 10mV
input impedance of the measuring stage: higher than 10E11 Ω

4 current channels to measure the protection current:
10mA range on channel 4

Measurement shunt: 0.5Ω (voltage drop 5mV under 10mA).
measuring range: 100µA to 10mA
resolution: lower than 3µA
accuracy (hysteresis, linearity and repeatability): lower than 100µA

20mA range on channel 5

Measurement shunt: 0.25Ω (voltage drop 5mV under 20mA).
measuring range: 200µA to 20mA
resolution: lower than 6µA
accuracy (hysteresis, linearity and repeatability): lower than 200µA

Open range on channel 6

No measurement shunt: the customer selects his shunt. The shunt will be placed near the coupon to evaluate the noise.

50mA range on channel 7

Measurement shunt: 0.1Ω (voltage drop 5mV under 50mA).
measuring range: 500µA to 50mA
resolution: lower than 15µA
accuracy (hysteresis, linearity and repeatability): lower than 500µA

50µA range on channels 4, 5, 6, 7

Measurement shunt: 100.5Ω shunt. (voltage drop 5mV under 50µA).
measuring range: 500nA to 50µA
resolution: lower than 20nA
accuracy (hysteresis, linearity and repeatability): lower than 500µA.


The SPC4 sensor allows the measurement of the protection current of a structure under cathodic protection.

The principle of measurement of the SPC4 sensor is based on the use of a steel coupon of the same nature as that of the structure.

This coupon is attached to the surface of the structure and masks a known surface of the latter. It is electrically connected via the SPC4 sensor. This allows the protection current to be "captured" and measured, and thus to evaluate its density.

The SPC4 sensor is equipped with 8 measuring channels (4 for current, 4 for voltage) and therefore allows four coupons to be connected.

EPC8 - 8-channel corrosion potential data logger




8 voltage channels to measure the corrosion potential in relation to the reference electrode:

Measuring range: +/-1.9VDC
Resolution: lower than 1mV
Accuracy: <0.2% of the dynamic measurement, i.e. 8mVDC. Includes: hysteresis, linearity, repeatability and drift in the 0-30°C operating temperature range.
Voltage of the reference electrode: 1.98VCC

The parameter setting and reading of the EPC8 data logger are performed without opening the housing, using the WinMemo software and the Data Pencil. The latter is connected to the serial link of a PC computer at one end, and placed against the centre of the induction read zone (marked) at the other so as to establish the connection with the EPC8.


It allows the potential difference to be measured between a coupon and a reference electrode. It comprises 8 independent measuring channels. The EPC8 is autonomous and designed to be installed in a humid marine environment.

ECAT - Atmospheric corrosion Recorder

Datenblatt [116 KB]



ECAT allows to monitor the variation of resistance of a thin layer metallic sensor (copper, silver,…) for the determination of the corrosion index of a medium.

Autonomy > 2 years
Reading and programming via portable inductive link (Data Pencil), from a Windows PC software
Housing : IP65, dimensions : 64 x 50 x 37mm, weight 85g.

2 voltage channels, resolution : < 200nV
1 current channel, resolution : < 2.5nA


ECAT is an autonomous data logger that allows to monitor atmospheric corrosion.
It can be used in confined spaces or in places where no electricity is available, for example : display housings (in museum), cabinets intended for the storage of invaluable or fragile objects, transport packaging, electrical cabinets…

© terra4 GmbH 2017