Cooling tower fan three parameter monitor

Cooling tower fan three parameter monitor

Cooling tower fan three parameter monitor

This probe can conveniently detect the true effective value of vibration velocity within a wide frequency range of vibrating objects (defined as intensity value in equipment safety regulations), while also monitoring temperature changes associated with the vibration point. Therefore, it is also suitable for direct measurement of vibration safety and temperature rise safety of other large and medium-sized rotating machinery and moving equipment such as blowers, water pumps, reducers, bearing seats, rolling friction bodies, etc., without the need for additional follow-up work on signal conversion and calibration issues

The integrated three parameter (oil temperature, oil level, vibration) combination probe is a universal non bus structure combination probe in the safety monitoring system of cooling tower fans. It can be directly connected to the "KR-939B3 Fan Safety Monitor" to achieve single device monitoring. It can also be connected to various general-purpose secondary instruments or computer data acquisition and control systems (DCS, PLC, etc.) for use.

The three parameter combination probe, which is used for monitoring the safe operation of wind turbine gearboxes, integrates sensing, conversion, and transmission circuits for measuring oil temperature, oil level, and vibration signals inside. It directly outputs 4-20mA standard current signals corresponding to these safety parameters and can be matched with various general-purpose secondary instruments or computer digital acquisition and monitoring systems.

The temperature measurement inside the probe uses semiconductor integrated sensors; The oil level measurement adopts the principle of thermal conductivity sensing; The magneto electric sensor used for vibration measurement can directly obtain the velocity signal of mechanical vibration. After passing through an amplifier, bandpass filter, and true RMS converter, the complex vibration waveform within the effective bandwidth is converted to true RMS. Finally, the voltage/current drive circuit generates a 4-20mA output.

The three parameter combination probe is a small integrated all stainless steel anti-corrosion structure, and its output transmission method has long-term anti-interference ability. Coupled with good sealing, seismic and explosion-proof measures, it can work online for a long time in harsh environments on the measurement site.

This combination probe can conveniently obtain important parameters closely related to the safe operation of the measured object, making it highly suitable for direct safety monitoring of other rotating machinery, reciprocating machinery, and other equipment. It is a vibration safety monitoring unit for modern industry, national defense, and scientific research.

Main technical performance and indicators

· Appearance and installation structure:

KR-939SB3typeoneThe integrated three parameter combination probe is a stainless steel fully enclosed waterproof structure, weighing about 0.6kg. The probe is in the form of an external thread and is installed in the threaded installation hole of the fan gearbox. The probe rod is inserted into the gearbox to obtain the lubricating oil temperature, lubricating oil level, and box vibration signal in the gearbox, and complete the transmission output.The thread specifications and probe insertion depth need to be declared at the time of ordering.

· Temperature measurement characteristics:

Lubricating oil temperature measurement range: 0-100 ℃, comprehensive temperature measurement error: ± 1 ℃

· Oil level measurement characteristics:

Lubricating oil level measurement range: -10~40mm (0mm is the lower limit position of the normal oil level of the gearbox), comprehensive error of oil level measurement: ± 5mm

At the initial power on, it is necessary to preheat steadily for about 2 minutes; Response damping time is about 1 minute; The tested medium must be a non-conductive medium.

· Vibration measurement characteristics:

Vibration measurement range: 0-20mm/s, measurement output is proportional to the true effective value (RMS) of vibration velocity, vibration measurement frequency band range: 10-1000HZ, comprehensive vibration measurement error: ± 1mm/s

· Signal output characteristics:

Active current type output: DC/4-20mA, requires passive resistive load. Calculation of maximum load resistance (including transmission line internal resistance):Rmax=（V-15)/0.02 (includingVFor power supply voltage)

· Power supply characteristics:

Working voltage: DC/24V ± 2V, no-load working voltage: DC/18V, high protection voltage: DC/30V, rated current: DC/80mA, maximum instantaneous working current: 150mA, equipped with voltage polarity reverse protection.

· Environmental characteristics:

Environmental temperature range: -20~80 ℃, environmental humidity range: 0~99.9% (ports sealed with 704 silicone rubber)

· Electrical connection:

5-wire 6-terminal connection: 1#+V+24V power supply; 2# GCan be connected to the shell for shielding; 3# -VPublic ground wire; 4# TTemperature signal output; 5#AVibration signal output; 6#LOil level signal output.