Frequently Asked Questions for Omron Liquid Leakage Sensors

Omron 3/5/2019


Can the Liquid Sensor "K7L" detect pure water?


 Yes, it can.

Even pure water with resistance of 10MΩcm or above includes lots of impurities when it leaks and then the resistance decreases. Thus, use the K7L with maximum sensitivity to detect almost all of impurities. 

Omron Liquid Leakage Sensors FAQ


Can the Liquid Leakage Sensor Amplifiers "K7L" detect oil?


 It is almost impossible.

However, in the case when oil such as cutting oil and used engine oil contains lots of impurities including metal powders, it may be detected.

Confirm the above by evaluating with actual equipment. 

Omron Liquid Leakage Sensors FAQ


Can a single Liquid Leakage Sensor Amplifiers "K7L" detect more than one liquid leakage?


Yes, it can.

It is possible to detect more than one liquid leakage with a single K7L by connecting sensing bands in parallel with use of terminal blocks

However, be aware that the sensing band where a liquid is leaked cannot be specified.

Omron Liquid Leakage Sensors FAQ


How does the D7G-F Vibration Sensor prevent false detection of earthquakes?


 The D7G-F Vibration Sensor operates with the following mechanisms.

1) When an earthquake occurs, the Sensor will detect that the vibration level has exceeded the detection vibration level.

2) If the vibration cycle is 0.1 to 2.0 s and it continues for more than 1.5 cycles, the Sensor will detect an earthquake.

3) When the acceleration of the vibration exceeds the set value, the Sensor concludes that there is an earthquake and the Vibration Sensor operates.

Even if the acceleration reaches the set value, if the vibration cycle is not within the range, the Sensor will conclude that there is no earthquake, thus preventing a false detection.

In locations where vibrations or waves similar to seismic waves (false vibrations) occur, it may operate. Check whether there are false detections when selecting a location to use the Sensor.

Test the planned installation location by installing the D7G-F for 1 to 2 days and seeing if the operation indicator lights, or the display goes above 100 gal. If either of these happens, vibrations similar to earthquakes are probably being detected in that area, so change the installation location.


What is the monitor output resolution and/or the analog output resolution of the D7F-C01/-C03 Vibration Sensor?


The monitor output and analog output of the D7F-C01⁄-C03 do not have resolutions.

This is because there is no A⁄D conversion circuit. Analog data is output as analog output.

The resolution of the output waveform is the resolution of the measurement device, such as an oscilloscope.


If D7G-F Vibration Sensor is directly mounted on a machine that sways, can it still detect earthquakes?


The D7G-F senses vibration in the X-Y direction so it cannot detect earthquakes if it is mounted directly onto the machine. Mount it on a fixed post or pillar instead.


How much inclination can D7E-1/-2 Vibration Sensor tolerate if it is mounted on a horizontal surface?


 An inclination of 0.5° can be tolerated for horizontal mounting.

Make sure that the inclination does not exceed 0.5°.


What are the characteristics of the 1st and 2nd stage outputs of the D5R-1517 Inclination Sensor?


 The D5R-1517 has a two-stage operation.

(1) The 1st stage output is a 1-Hz intermittent output.

The deviation of the operating angle (ON) for the 1st stage is as follows:

15 °±1.5 ° (+13.5° to 16.5°)

-15°±1.5° (-13.5° to -16.5°)

(2) The 2nd stage output is a continuous output.

+ angle: 1st stage operating angle +2°±1° (1st stage +1 to +3°)

- angle: 1st stage operating angle -2°±1° (1st stage -1 to -3°)

Hysteresis width s not stipulated y standards.

The actual hysteresis width is 0.1° max.

Omron Liquid Leakage Sensors FAQ

The intermittent and continuous outputs are output from the same open-collector output.

Omron Liquid Leakage Sensors FAQ


What is the meaning of the settings unit "xx% FS" on D7F-C03 Vibration Sensor Level Meter?


The display/settings unit of the D7F-C03 Level Meter is % FS.

FS is an acronym for full scale. It indicates the full size of the measurement range.

Therefore % FS indicates a fraction of the full scale, in the form ××%.


Set the operating mode to ACC (acceleration) and the GAIN switch to the ×1 range.

Referring to the specifications in the D7F catalog, the corresponding full scale is 98 m/s2

Under these conditions, looking at the indicators,

The threshold setting 55% to 65% FS, in terms of acceleration, becomes 98 m/s2 × 0.55 = 53.9 m/s2. Following this calculation, the range is 53.9 to 63.7 m/s2.


What is the setup procedure for D7F-C03 Vibration Sensor?


The D7F-C03 is a Controller with a linear output. Use the following procedure to set it up.

(1) Select the Operating Mode Set the ACC/VEL Selector to either ACC (acceleration) or VEL (velocity). If you are not sure, set it to ACC.

Acceleration is the change of speed per unit of time. The range of vibration frequencies that can be detected in the ACC mode is broader than in the VEL mode. (The frequency range of ACC mode is 20 to 2,000 Hz.)

The ACC mode is applicable when the vibration frequency is relatively high.

Velocity is the change in distance per unit of time. It is applicable when the vibration frequency is relatively low.  (The frequency range of VEL mode is 10 to 1,000 Hz.)

Depending on the sensing object, the VEL mode may be better than the ACC mode. Try the ACC mode first, but if you encounter many detection errors, set the Controller to VEL mode.

(2) Set the Gain Set the GAIN Selector in accordance with the level of vibration.

Select a gain from the following three ranges.

The ×10 range is for 9.8 m⁄s2 or lower, and therefore represents a more sensitive setting compared to the ×1 range.

Range ACC (acceleration) VEL (velocity)
x 1 0 to 98 m/s2 0 to 20 mm/s
x 5 0 to 19.6 m/s2 0 to 4 mm/s
x 10 0 to 9.8 m/s2 0 to 2 mm/s

If the transistor output is used, follow the steps 3 and 4 below.

(3) Set the RUN/SET Selector to SET The threshold values for ten vibration levels will be displayed on the Level Meter. (These are points where the output turns ON.) Use the threshold adjuster to set the threshold values.

(4) Set the RUN/SET Selector to RUN The current vibration level out of the 10 possible levels will be displayed on the Level Meter.

If the Level Meter display does not reflect the change in vibration, try switching the operation mode (ACC/VEL) and the gain (range: ×1, ×5, and ×10).


Omron Liquid Leakage Sensors FAQ


(1) RUN/SET Selector

The RUN/SET Selector sets the Level Meter indication to RUN or SET.

(2) ACC/VEL Selector

The ACC/VEL Selector sets the operating mode to acceleration or velocity.

(3) GAIN Selector

The GAIN Selector changes the signal strength.

(4) Threshold Adjuster

The Threshold Adjuster sets the threshold value.

Indicators (5)Level (10 levels)

RUN: Indicates vibration magnitude. SET: Indicates threshold settings.

Level Meter levels Vibration level and threshold settings
10 95% or higher FS
9 85% to 95% FS
8 75% to 85% FS
7 65% to 75% FS
6 55% to 65% FS
5 45% to 55% FS
4 35% to 45% FS
3 25% to 35% FS
2 15% to 25% FS
1 5% to 15% FS

Note:Use the Level Meter indicator strictly as a guideline.

(6) PWR/ALM Indicator

Power ON: Green light Sensor error: Red light

(7) OUTPUT Indicator

The output transformer operates and the OUTPUT indicator lights at vibration levels exceeding the threshold setting. The output and indications are the same whether RUN or SET is selected.

(8) SET Indicator

The SET Indicator is lit when SET is selected from the RUN/SET selector.