KR-939SB3 Three-parameter Combination Probe Application

BRIEF INTRODUCTION

The KR-939SB3 integrated three-parameter (oil temperature, oil level, vibration) combination probe is a versatile probe from the Star Machine KR-939 series, designed for the safety monitoring system of cooling tower fans. It features a non-bus structure for easy integration.

It can be directly connected to the "KR-939B3 Fan Safety Monitor" for monitoring a single device. Additionally, it can be used with various general-purpose secondary instruments or computer data acquisition and control systems (such as DCS, PLC).

This KR-939SB3 integrated probe is used for monitoring the safe operation of fan gearboxes. It integrates sensors, converters, and transmitter circuits for measuring oil temperature, oil level, and vibration signals. The probe directly outputs 4-20mA standard current signals corresponding to these safety parameters and can connect to various general-purpose secondary instruments or computer digital acquisition and monitoring systems.

MAIN TECHNICAL PERFORMANCE AND INDICATORS

The KR-939SB3 integrated three-parameter probe features a fully enclosed stainless steel waterproof design, weighing approximately 0.6 kg. It is installed in the threaded mounting hole of a fan gearbox using an external thread, with the probe rod inserted into the gearbox. This allows it to measure the temperature and level of the lubricating oil as well as the vibration of the gearbox, and transmit these signals.

Thread specifications and probe insertion depth must be specified at the time of ordering. 

TEMPERATURE MEASUREMENT CHARACTERISTICS:

Lubricating Oil Temperature Measurement Range: 0 ~ 100 ℃,

Temperature Measurement Tolerance: ± 1 ℃. 

OIL LEVEL MEASUREMENT CHARACTERISTICS:

Measuring range of lubricant oil level: -10～40㎜ (0mm indicates the oil level limit position when the gearbox is at its normal oil level),

oil level measurement tolerance: ±5㎜.

SIGNAL OUTPUT CHARACTERISTICS:

Active current type output: DC/4～20mA, and passive resistive load is required.

Maximum load resistance measurement (including the internal resistance of the transmission line): Rmax = (V-15)/0.02 ( V is the supply voltage).

POWER SUPPLY CHARACTERISTICS:

Operating voltage: DC/24V±2V,

no-load voltage: DC/18V,

maximum protection voltage: DC/30V,

rated current: DC/80mA,

maximum instantaneous operating current: 150mA,

The probe has built-in voltage reverse polarity protection.

ENVIRONMENTAL CHARACTERIZATION:

Environmental temperature range: -20 to 80°C,

Environmental humidity range: 0 to 100% (ports sealed with 704 silicone rubber).

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