Product
Combined Probe KR-939SB3
Product Description
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
Product Details
The KR939SB3 Three-Parameter Combination Probe is a versatile monitoring device designed for cooling tower fan safety monitoring systems. It integrates oil level, temperature, and vibration measurement functions into a single compact unit, enabling comprehensive condition monitoring of fan gearboxes.
It can be connected to various general-purpose dual-mode instruments or computer data acquisition and control systems (DCS, PLC, etc.).
Features
The KR939SB3 combines temperature sensing, oil level detection, vibration monitoring, signal processing, and signal transmission within one integrated device.
Measures oil temperature using a platinum resistance temperature sensor and integrated semiconductor circuits.
Detects oil level through capacitive sensing technology.
Acquires mechanical vibration acceleration signals using a built-in vibration sensor.
Incorporates signal filtering, RMS conversion, and signal conditioning for accurate measurement output.
Provides standard 4–20 mA current outputs for temperature, oil level, and vibration parameters.
Compatible with a wide range of industrial monitoring and control systems.
Compact design for simplified installation and reduced wiring requirements.
Operating Principle
The vibration signal is processed through band-pass filtering and RMS conversion to obtain reliable vibration values within the effective frequency range.
The temperature, oil level, and vibration measurements are then converted into standard 4–20 mA output signals for transmission to monitoring and control systems.
Parameter
Temperature measurement characteristics | Lubricating oil temperature measurement range | 0~100℃ |
Temperature measurement comprehensive error | ±3℃ | |
Oil level measurement characteristics | Lubricating oil level measurement range | -10 ~ 40 mm |
The maximum measurement error level | < = + 1 mm | |
Vibration measurement characteristics | Vibration measuring range | 0 ~ 20 mm /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 mm /s < = vibration | |
Signal output characteristics | Active current output type | DC/4 ~ 20mA; requirements for passive resistive load |
Maximum load resistance | < 300 ohm | |
Supply characteristics of the power supply | Working voltage | DC/24V ±4V, |
Maximum protection voltage | DC/30V | |
Rated current | DC/80mA | |
Maximum instantaneous working current | 120mA; Internal voltage polarity reverse protection | |
Environmental characteristics | Ambient temperature range | – 20 ~ 80 degrees |
Humidity range | 0 ~ 100% (Port 704 using a silicon rubber seal) | |
Electrical connection | Two four-bit terminals | +24V power, GND, It, t-COM, Io, o-COM, Iv, v-COM: It, |
Typical wiring | Temperature and current signal output; Io oil level current signal output; Iv vibration current signal output |
Electrical connection
5-wire 6-terminal connection:
1# +V: +24V power supply;
2# G: connected with the shell can be connected to the shield;
3# -V: Public ground wire;
4# T: temperature signal output;
5# A: vibration signal output;
6# L: oil level signal output.
Typical wiring: see the schematic diagram of the probe wiring principle.
Installation and Application
The KR939SB3 is designed for straightforward installation and seamless integration into existing monitoring systems.
Operation Procedure
1. System Start-Up
After verifying all electrical connections, start the monitoring system to begin real-time acquisition of oil temperature, oil level, and vibration data.
2. Data Analysis
Utilize the monitoring platform to process and analyze operating data, enabling the identification of abnormal conditions and potential equipment issues.
3. Alarm and Protection
When measured values exceed preset thresholds, the monitoring system can generate warning or alarm signals to support timely maintenance actions.
4. Maintenance Management
Perform periodic inspection and maintenance of the probe to ensure reliable long-term operation. Monitoring data can be used to support condition-based maintenance planning and improve equipment reliability.
If you would like to learn more about the KR939SB3 Three-Parameter Combination Probe, please contact me:
Email:alex@starmachinechina.com
Phone/Whatsapp: +86 18943497883