Explosion proof electric heater manufacturers should calibrate their instruments once a year

Explosion proof electric heater manufacturers should calibrate their instruments once a year

Currently, although many machines no longer require many people to operate, it is still necessary to arrange for someone to pay attention to the dynamics of the machine equipment. We have also seen in many TV shows the phenomenon of machine equipment alerting but no one paying attention and causing serious consequences. The explosion-proof electric heater manufacturer has a temperature control instrument to achieve the main control function.

The main control function of the electric heater manufacturer is achieved by a temperature controller. The temperature controller of the temperature controller collects the temperature signal at the outlet of the electric heater, outputs a 4-20mA signal to the thyristor through PID calculation, controls the output power of the electric heater, and can achieve smooth adjustment of 0-100% output power; The temperature controller on the main console has a low temperature alarm function. When the medium temperature is lower than the low temperature alarm set value, the control cabinet has a low temperature alarm indication;? ST2 serves as an internal overheating alarm and shutdown control instrument for the electric heater. After the alarm, the electric heater can only be restarted when the temperature drops and the alarm status is cut off after manual reset; The electric heater is equipped with liquid level status monitoring. When the liquid level is low, the control cabinet will issue an alarm indication. When the liquid level is too low, turn off the entire electric heater and alarm, prompting the user to refuel; The status and alarm information of the electric heater have been connected to the PIC system, and the operator can easily and conveniently understand the various states of the electric heater in the PLC. Inspection and preparation before operation of electric heater:

Check if the main switch, voltage conversion switch, temperature control instrument, and over temperature alarm instrument of the electric heater control cabinet in the distribution room are normal; When the electric heater is first put into operation, professional technical personnel should be present, and the instrument should be calibrated once a year. If the instrument error exceeds the range, it is usually caused by humidity, dust, or corrosive gases. Cleaning and drying the interior of the instrument can usually solve the problem. Try not to modify SC parameters to correct instrument errors. The AI series instrument is an advanced maintenance free instrument that does not provide users with the ability to recalibrate the instrument. Adopting automatic zero adjustment technology, it can be used for a long time without zero drift. Digital calibration technology eliminates the adjustable resistance of stability errors, so the instrument itself does not produce errors due to increased usage time. Generally, errors may be caused by humidity and corrosion, and accuracy should be restored through drying and cleaning rather than recalibration. If drying and cleaning cannot restore accuracy, the secondary instrument should be returned to the manufacturer for maintenance as a faulty instrument. Check that there is no medium flowing inside the electric heater during use to prevent it from burning out; Check the thermal oil level gauge of the electric heater in the station and keep a record; Check if the explosion-proof junction box of the electric heater is reliably grounded. Check if the instrument parameters in the electric heater control cabinet are set according to the process parameters. Operation steps: Turn on the main power switch of the electric heater control cabinet in the distribution room, close the circuit breaker QF of the electric heater, power on the system, and make it in an operable state; When the control circuit is powered on, the temperature controller begins to display the temperature, and the main control table sets the control temperature for the electric heater. The alarm table sets the internal overheating alarm temperature of the electric heater.

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