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KR-939SB3 Combined Sensor
Tri-Parameter Combined Sensor
Oil Temperature: 0-100 °C
Oil Level: -10~40 mm
Vibration: 0-20 mm/s
This tri-parameter combined probe (oil level, temperature, and vibration) is a universal, non-bus structured combined probe developed by our company for safety monitoring systems in cooling tower fans. It can connect to various universal secondary instruments or computer data acquisition and control systems (DCS, PLC, etc.).
Designed for monitoring the safe operation of fan gearboxes, this combined probe integrates sensing and signal conditioning circuits for measuring oil temperature, oil level, and vibration. It directly outputs standard 4-20mA current signals corresponding to these safety parameters, compatible with various universal secondary instruments or computer digital acquisition and monitoring systems.
Temperature Measurement: Utilizes a platinum resistance sensor (RTD) and semiconductor integrated circuitry.
Oil Level Measurement: Operates based on the capacitive sensing principle.
Vibration Measurement: The sensor directly acquires mechanical vibration acceleration signals. Through amplification, band-pass filtering, first-order integration, and a True RMS (Root Mean Square) converter, vibration waveforms within the effective bandwidth are converted into their true RMS value. The final output for vibration is proportional to the vibration velocity RMS.
Output: Oil level, temperature, and vibration each generate independent 4-20mA output signals.
Appearance & Mounting Structure:
The probe features an external thread design for installation into threaded mounting holes on the fan gearbox. The probe stem inserts into the gearbox to acquire signals for lubricating oil temperature, oil level, and gearbox casing vibration, performing signal conditioning and transmission. Thread specifications and probe insertion depth must be specified when ordering.
Temperature Measurement Characteristics:
Lubricating Oil Temp. Range: 0-100 °C
Overall Temp. Measurement Error: ±3 °C
Oil Level Measurement Characteristics:
Lubricating Oil Level Range: -10~40 mm
Max. Oil Level Measurement Error: ≤ ±1 mm
Vibration Measurement Characteristics:
Vibration Measurement Range: 0-20 mm/s (Velocity RMS)
Output proportional to Vibration Velocity RMS
Vibration Measurement Frequency Range: 10-1000 Hz
Max. Vibration Measurement Error: ≤ ±1 mm/s
Signal Output Characteristics:
Active Current Output: DC 4-20mA (Requires passive resistive load)
Max. Load Resistance: < 300 Ω
Power Supply Characteristics:
Operating Voltage: DC 24V ±4V
Max. Protective Voltage: DC 30V
Rated Current: DC 80mA
Max. Instantaneous Operating Current: 120mA
Built-in Reverse Polarity Protection.
Environmental Characteristics:
Ambient Temperature Range: -20~80 °C
Ambient Humidity Range: 0~100% RH (Ports sealed with Silicone Rubber 704)
Electrical Connections:
+24V: Power Supply Positive
GND: Ground / Power Supply Negative
It: Temperature Current Signal Output (4-20mA)
t-COM: Temperature Common Terminal
Io: Oil Level Current Signal Output (4-20mA)
o-COM: Oil Level Common Terminal
Iv: Vibration Current Signal Output (4-20mA)
v-COM: Vibration Common Terminal
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