GlobeCore / Products / Instruments - Transformer Oil Testers / TOR-7 Universal Transformer Oil Tester (moisture, gases, solid particles)

TOR-7 Universal Transformer Oil Tester (moisture, gases, solid particles)

The TOR-7 transformer oil tester measures moisture, hydrogen, gas content, and solid particle contamination in a single device. Water activity (aw) is measured from 0 to 1 with high accuracy, and temperature is recorded. Hydrogen and contamination are measured from 25–5,000 ppm with good precision and low cross-sensitivity to other gases. Oil purity is assessed according to ISO 4406 and SAE standards, covering a viscosity range of 1–1,000 mm²/s and ISO contamination classes from 9/8/7 to 25/24/23.

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Description
Specification
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The TOR-7 transformer oil tester is designed to determine the volumetric gas content, moisture, contamination by solid particles, and hydrogen content in oil. The device can analyze mineral transformer oils with specific characteristics:

kinematic viscosity at 50 °C – 2…12 mm²/s;
density at 20°C – 800…950 kg/m³;
mass moisture content in oil – not more than 10 ppm;
industrial purity class according to ISO 4406 – not worse 21/19/16.

Operating Principle

Measurements are based on tracking the pressure change of gas within a vacuumed cylinder during the pouring of an oil portion. Considering the volumes of the cylinder and the poured oil, as well as the pressure inside the cylinder before and after pouring, one can determine the volumetric gas content. With the help of sensors and a control board, the moisture content, oil temperature, hydrogen content, and the number of solid particles in the oil are calculated and displayed on the screen.

General technical specifications

№	Item	Value
1	Measuring cell volume, l	1,2
2	Oil sample volume, l	0,5 – 0,7
3	Maximum pressure in the device, Pa	0,3
4	Maximum leakage in the device, Pa	26
5	Inlet oil pressure, bar	0,3 — 3
6	Temperature of measured oil, ºС	20 — 90
7	Maximum power consumption, kW, no more	1
8	Electrical current parameters: — voltage, V — variable with frequency, Hz	Customer request
9	Overall dimensions, mm, not more than — length — height — width	465 530 375
10	Weight, kg, not more than	40

Oil measurement characteristics

№	Item	Value
Moisture measurement characteristics
1	Operating range, aw (water activity (aw))	0…1
2	Accuracy at 20 °C	±0.02 aw (0…0.9 aw) ±0.03 aw (0.9…1 aw)
3	Temperature measurement	yes
4	Working environment temperature, °C	0…55
Hydrogen measurement characteristics
6	Measuring range, ppm	25-5000
7	Accuracy	20% of measurement or 25 ppm
8	Repeatability	10% of measurement or 15 ppm
9	Response time	<60 min (90% step change)
10	Cross Sensitivity	Less than 2% cross-sensitivity to other gases (CO, CO2, Hydrocarbons)
11	Working environment temperature, °C	0…55
Contamination Measurement Characteristics
6	Measuring range, ppm	25-5000
7	Accuracy	20% of measurement or 25 ppm
8	Repeatability	10% of measurement or 15 ppm
9	Response time	<60 min (90% step change)
10	Cross Sensitivity:	Less than 2% cross-sensitivity to other gases (CO, CO2, Hydrocarbons)
11	Working environment temperature, °C	0…55
Characteristics of degree of purity or level of contamination
12	Acceptable viscosity range	1 to 1000 mm²/s
13	Measured variables	ISO 99 (ISO 4406:1999) SAE (SAE AS 4059) or ISO 87 (ISO4406:1987) NAS (NAS 1638)
14	Measurement range	Measurement from ISO class 9/8/7 (MIN) to ISO class 25/24/23 (MAX) Calibrated to ISO range from 11/13/10 to 23/21/18
15	Accuracy	+/- ½ ISO class in calibrated range
16	Working environment temperature, °C	0 … +85

measurement of four crucial parameters of transformer oil (moisture, hydrogen, contamination by solid particles, gas content) in a single device;
an integrated printer is available, measurement results can be printed out;
reliable performance;
сonvenient and durable housing.