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Inline Oil PPM Moisture Content Sensor

Apr. 17, 2024

HOPU HHW350 Series Inline Oil Moisture Tester adopts advanced water content sensitive element and temperature sensitive element, it can measuring water content, water activity and temperature in harsh environment continuously, accurately, fast.Measuring oil: lubricant oil, hydraulic oil, engine oil, fuel, insulating oil, turbine oil, etc.

Inline Oil PPM Moisture Content Sensor


1. Measuring water activity of oil fast and continuously;

2. Measuring water content accurately;

3. High stability in harsh area;

4. Small in size.

5.Worldwide business and technical certification such as CE, ASTM1657,UKCA.

6.High sensitive to various kinds of pollution in oil

7. Color LCD Display PPM result

Inline Oil PPM Moisture Content Sensor

HOPU online Oil Water Content Tester Technical Specifications

measuring range

0 … 1 aw

measurement accuracy

0 … 0.6 ± 0.02 aw

0.6  1 ± 0.02 aw

resolving power

0.001 aw

Response time (typical)

<1 minute

Water content in oil (dissolved water)

measuring range

0…100ppm 500 ppm 1000ppm 2000ppm or customized

measurement accuracy

± 10 %


measuring range

-40 ... 120 °C

accuracy(at +25 °C

± 0.3°C

Working temperature (environment)

-40 ... +80 °C

Permissible oil temperature

-40 ... +120 °C


digital signal

RS485 MODBUS RTU, (RS232 optional)

analog signal

4... 20 mA load resistance500Ω


Mechanical interface

G 1/2 "ISO or 1/2" NPT

Probe allowable working pressure

For other pressure ranges of 20bar, please consult

Probe material

316&304 stainless steel

Protection level


Power supply

9V-36V DC (for RS485 communication) 15V-36V DC (for 4... 20 mA communication)

Power supply current

<5mA+load current

Weight of transmitter

200 g

Total weight of packaging


Packaging specifications

Paper box 172 x 117 x 53 mm

Cable specifications

M8 * 1 6-core

Cable length

6-core 2-meter UL20866 6 * 22AWG

Electromagnetic compatibility standards

CE/ISO EN61326-1, EN61000-3, EN61010 Class B

Inline Oil PPM Moisture Content Sensor

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Your inquiry will be replied within 12 hours due to time zone difference

Your inquiry is warmly welcomed!

HOPU Website: www.hopufiltration.com

Branch 1:  www.hpoilsolution.com 

Branch 2:  www.hopuoilpurify.com 

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