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Basic Info

KR939SB3 three parameter combination (oil level temperature vibration combination) probe is a general type combined probe that is used in cooling tower fan safety monitoring system. It can be connected with a variety of general two instruments, or computer data acquisition and control system (DCS, PLC, etc.).

This is applied to the fan gear box combined probe for safe operation of monitoring, in its internal integrated measuring temperature, oil level, vibration signal sensing, conversion and transmission circuit of direct output and the security parameters corresponding to the 4 ~ 20mA standard current signal, can be matched with a variety of general-purpose two meter or computer digital acquisition monitoring system.

The probe temperature measurement with platinum resistance sensor and semiconductor integrated device; level measurement using a capacitive sensing principle; sensor for measuring  vibration, mechanical vibration acceleration signal acquisition, band-pass filter, an integral and true effective value through the amplifier (RMS) converter, the vibrationwaveform in the effective bandwidth of it effective value conversion; finally, the oil temperature, vibration generated by the 4 ~ 20mA output.

Main technical performance and indicators

External and installation structures:

KR939SB3 three parameter combination probe, the probe is an external thread form, is installed in the threaded installation hole of the fan reduction box, and the probe rod is inserted into the reduction box, so as to get the lubricating oil temperature, the lubricating oil level and the box vibration signal in the reduction box, and complete the transformation output. Thread specifications and probe inserts need to be declared at the time of order. 

Temperature measurement characteristic:

Measurement range of lubricating oil temperature:0~100 ℃ ,

Compreh-ensive error of temperature measurement:±1℃

Oil level measurement characteristics:

Measurement range of lube oil level:0~50㎜(10 mm for the gear box under normal oil level oil limit position), 

Maximum error of oil level measurement: <= ±1㎜

Ambient temperature from -40 to 65 C(Extreme temperature resistance from -50 to 150 C)

Vibration measurement characteristics:

Range of vibration measurement:0~20 ㎜/s ,The measurement output is proportional to the effective value of the vibration velocity (RMS). Frequency range of vibration measurement: 10~1000HZ, Maximum error of vibration measurement: <=±1㎜/s

Signal output characteristics:

Active current type output:DC/4~20mA ,Requirements for passive resistive load

Maximum load resistance:< 300 Ohm

Supply characteristics of power supply:

Working voltage:DC/24V±4V,

Maximum protection voltage:DC/30V ,

Rated current:DC/80mA, 

Maximum instantaneous working current:120mA,

Internal voltage Ambient temperature range:-20~80℃,

Ambient humidity range:0~100%(The port is sealed with 704 silicone rubber seals)

Electrical connections:

The KR-939SB3 three-parameter combined probe is applied to the combined probe for monitoring the safe operation of cooling tower fans. The sensor, conversion, and transmission circuits for measuring the gearbox oil temperature, oil level, and mechanical vibration signals of the fan are integrated inside the probe. The probe directly outputs 420mA standard current signals corresponding to these safety parameters. The KR-939SB3 three-parameter combination probe can be connected to DCS and PLC computer measurement and control systems for use.


Product Description

Use installation:

KR-939SB3 integrated three-parameter combination probe is installed in the threaded hole on the upper part of the fan gearbox (or other equipment under test) in the form of external threads. The probe rod is inserted into the gearbox to obtain the lubricating oil temperature, lubricating oil level, and box vibration signals in the gearbox, and complete the transmission and output.


Technical parameters:

1.Temperature measurement characteristics: lubricating oil temperature measurement range: 0100, temperature measurement comprehensive error±3 2.Oil level measurement characteristics: lubricating oil level measurement range: - 1040 Comprehensive error of oil level measurement amp; plusmn; 5

3.Vibration measurement characteristics: vibration measurement range: 020 /s, measurement output is proportional to the true effective value (RMS) of vibration speed, vibration measurement frequency band range: 101000 HZ, vibration measurement comprehensive error amp; plusmn; 1 /s 4.Signal output characteristics: Current output: 420mA 5.Power supply characteristics: DC 24V 6. Environmental characteristics: Ambient temperature range: - 2080, ambient humidity range: 0100%


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