TOR-7 Universal Transformer Oil Tester (moisture, gases, solid particles)
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
| No. |
Parameter |
Value |
| 1 | Measuring cell volume, L (gal) |
1.2 (0.32) |
| 2 | Oil sample volume, L (gal) | 0.5–0.7 (0.13–0.18) |
| 3 | Maximum pressure inside the instrument, Pa (psi) |
0.3 (0.00004) |
| 4 | Maximum leakage inside the instrument, Pa (psi) |
26 (0.004) |
| 5 | Oil inlet pressure, bar (psi) |
0.3–3 (4.4–43.5) |
| 6 | Temperature of tested oil, ºС (ºF) |
20–90 (68–194) |
| 7 | Max power requirement, kW | |
| 8 | Power supply parameters:
— voltage, V — AC frequency, Hz |
Customizable |
| 9 | Overall dimensions, mm (in), max
— length — height — width |
465 (18.3) 530 (20.7) 375 (14.8) |
| 10 | Weight, kg (lbs), max |
40 (88) |
Oil measurement specifications
| No. | Parameter | Value | |
| Moisture measurement specifications | |||
| 1 | Operating range, aw (active water) | 0…1 | |
| 2 | Accuracy at 20 °C (68 °F) | ±0.02 aw (0…0.9 aw) ±0.03 aw (0.9…1 aw) | |
| 3 | Temperature measurement | Yes | |
| 4 | Operating medium temperature, °C (°F) | 0…55 (32…131) | |
| Hydrogen measurement specifications | |||
| 6 | Measurement range, ppm | 25–5,000 | |
| 7 | Accuracy | 20 % of indication, or 25 ppm | |
| 8 | Repeatability | 10 % of indication, 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 | Operating medium temperature, °C (°F) | 0…55 (32…131) | |
| Contamination measurement specifications | |||
| 6 | Measurement range, ppm | 25–5,000 | |
| 7 | Accuracy | 20 % of indication, or 25 ppm | |
| 8 | Repeatability | 10 % of indication, or 15 ppm | |
| 9 | Response time | <60 min (90 % step change) | |
| 10 | Cross-sensitivy | Less than 2% cross-sensitivity to other gases (CO, CO2, hydrocarbons) | |
| 11 | Operating medium temperature, °C (°F) | 0…55 (32…131) | |
| Oil purity or contamination levels | |||
| 12 | Permissible viscosity range | 1 to 1,000 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 grade 9/8/7 (MIN) to ISO grade 25/24/23 (MAX) Calibrated to ISO range from 11/13/10 to 23/21/18 |
|
| 15 | Accuracy | +/- ½ ISO grade in calibrated range | |
| 16 | Operating medium temperature, °C (°F) | 0 … +85 (32… 185) | |
- 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.