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Calibration Method for Sulfur Hexafluoride Density Relay

Density relay field calibrator, also known as "SF6 density relay calibrator", is used for single alarm, single lock, single alarm single lock, single alarm double lock value calibration of sulfur hexafluoride density relays on site.


The product adopts high-performance 16-bit single-chip microcomputer for detection and control, high-quality pressure sensor, and SF6 density relay calibrator, which has the advantages of less gas consumption and fast detection speed.


Ⅰ. On-site verification method of SF6 relay


Due to the limitation of gas transportation, the gas bottle received by the customer is an empty bottle, and the gas bottle should be inflated before use. The recommended inflation pressure is greater than 0.4MPa, and the gas type is not limited, but we recommend using nitrogen for testing.


1. Trachea connection


Connect the filled gas cylinder to the air inlet of the density relay calibrator with a special aviation connector, and connect the air outlet to the measuring gas path interface of the on-site SF6 density relay.


Note that the accessory box of the product has special adapters, which can meet more than 90% of the adapters on the market. Before connecting, the valve connected to the air chamber must be manually closed, otherwise it will cause gas leakage in the air chamber. The exhaust hole is used for Exhaust the tested gas.


If the test is to use sulphur hexafluoride gas after use, the exhaust pipe should be kept away from the operator and placed in a ventilated place to avoid gas poisoning.


The last is the connection of the signal line, which corresponds to the signal interface of the sulfur hexafluoride density of gas relay, such as: alarm signal, blocking signal, etc. After the connection is completed, you can prepare for the test.


2. Start the test


After completing the above steps, turn on the power switch of the tester, select Settings on the main interface, set the pressure value of the gas, and set the test items.


If you don't know how to set parameters, please refer to the detailed description in the manual or select "Start Measurement" by default, and the pressure gauge on the panel will slowly rise.


The pressure gauge types of the on-site SF6 density relay also rises synchronously. When the maximum test SF6 pressure is reached, the pressure returns, and the test result is displayed, and the test is completed.


Ⅱ. Precautions for using the SF6 relay


1. If the test is sulfur hexafluoride gas and it has been used, either use a gas recovery device to recover the gas or place it in a ventilated place to prevent poisoning.


2. If the pressure gauge on the panel of the density relay calibrator changes but the on-site SF6 density of gas relay does not change, it is because the thimble did not push the valve open, and the length of the thimble needs to be adjusted manually.


3. If the air inlet of the density relay calibrator is directly connected to the nitrogen bottle, a pressure reducing valve must be added at the front end, and the flow rate should be controlled at 0.6ml/m, otherwise the test result will be inaccurate.

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Lanso Instruments INC.
233 W 1st St #210, North Vancouver, Canada
info@lansoinstruments.com
233 W 1st St #210, North Vancouver, Canada
info@lansoinstruments.com