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　　Zinc reference electrode Uses: 1. Precise monitoring of cathodic protection status. Used as a sacrificial anode protection potential measurement, protection potential between 0V ~ + 0.25V.

　　2. In the external current cathodic protection system, for the automatic control of the stable signal source. Applicable to buried pipes and underground metal structures cathodic protection works.

　　3. Can be buried in the need to monitor and can not enter the location, such as: the bottom of the location of large containers, underground fuel storage, chemical tank can not be close to the location between the city road under the pipe network, etc., during the construction period in advance Buried, long-term use. 4. Telemetry source for pipeline cathodic protection.

　　I. Introduction

　　The reference electrode is one of the important components of the cathodic protection system. It can be used to measure the potential of the protected structure, but also as a potentiometer automatically control the source. Commonly used buried long-life reference electrode with Cu / CuSO4 reference electrode and zinc reference electrode, zinc reference electrode due to its compression characteristics, in some ceramic cans of copper sulfate reference can not be used to show its advantages The But at the same time zinc electrode potential stability than copper sulfate reference electrode is good, it is recommended that the two use.

　　Second, the installation guide

　　1. Buried position: the electrode is usually buried in the protection of metal structures near the ground is deep enough (usually 1 meter or so) of the soil, in a permanent moist environment. In areas where the groundwater level is high, the electrodes are buried in soils above 20 cm above the groundwater level, and the permafrost regions should be buried below the permafrost.

　　2. Buried method:

　　1) Immerse the reference electrode in an appropriate amount of distilled water or clean fresh water for not less than 2 hours.

　　2) Buried packing bags with electrodes buried in the buried pits are pre-dug and the surrounding soil is compacted, and then the appropriate amount of fresh water is poured into the buried sites to improve the electrode connection state.

　　3) Connect the electrode lead to the measuring circuit.

　　Third, pay attention to matters

　　1, the electrode handling should be careful to avoid, so as not to break, shock crack electrode, not allowed to pull the cable for handling tools.

　　2, the electrode should be placed in the buried before the dry and dry place, to avoid sun sun and rain.

　　3, to avoid with other chemicals together.

　　4, in the entire handling and installation process, to prevent the break through the cable insulation.

　　The main technical indexes of high purity zinc reference electrode