DGA Comparison Chart: Key Gas
How industry leading hydrogen and moisture monitors compare on gases monitored, installation and maintenance and system specifications. Dynamic Ratings supports communication to all major DGA monitors. We recognize that DGA monitors have different advantages and no one product would be optimal for all customers.
SupportedBlank: not supported or not listed
| Feature | Dynamic RatingsH2 | Dynamic RatingsH2 + Moisture | DobleCalisto 1 | DobleCalisto 2 | VaisalaMHT410 | General ElectricHydran M2 | General ElectricHydran 201Ti | Serveron®TM1 | MTE Meter Test EquipmentHydrocal 1001+ | MTE Meter Test EquipmentHydrocal 1003 | MR/MESSKO®Msense® x2.5 | HitachiCoreSense | MeggerInsuLogix® G2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gases monitored | |||||||||||||
| Hydrogen H2 | Yes | Yes | Yes | Yes | Yes | No | No | Yes | No | Yes | Yes | Yes | Yes |
| Composite gas sensor | No | No | No | No | No | Yes | Yes | No | Yes | No | No | No | No |
| Carbon monoxide CO | No | No | No | Yes | No | No | No | No | No | Yes | Yes | No | No |
| Acetylene C2H2 | No | No | No | No | No | No | No | No | No | No | No | No | Yes |
| Other information | |||||||||||||
| Moisture | No | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes |
| Temperature | No | Yes | No | No | Yes | No | No | Yes | No | No | No | No | Yes |
| Fluid compatibility | Headspace, mineral oil, silicone, natural & synthetic esters | Mineral oil, silicone, natural & synthetic ester | Mineral oil, silicone and natural & synthetic esters | Mineral oil, silicone and natural & synthetic esters | Mineral oil, silicone, natural & synthetic esters | Mineral oil, silicone and natural esters | Mineral oil, silicone and natural esters | Mineral oil | Mineral oil, silicone and natural esters | Mineral oil, silicone and natural esters | Mineral oil | Mineral oil and natural esters | Mineral oil and natural esters |
| Additional advantages when used with Dynamic Ratings | |||||||||||||
| Dynamic Ratings certified to install and service | Yes | Yes | Yes | Yes | Yes | No | No | No | No | No | No | No | No |
| Single point support from Dynamic Ratings | Available | Available | Available | Available | Available | No | No | No | No | No | No | No | No |
| Installation and maintenance | |||||||||||||
| Installation mounting (length × width × depth) | 1.56 × 1.56 × 5.94 in Screw onto valve | 19.4 × 8.8 × 6.7 mm (7.63 × 3.47 × 2.65 in) Screw onto valve | 483 × 381 × 325 mm (19 × 15 × 12.8 in), 22.7 kg (50 lb), connected to separate inlet and outlet transformer valves | 483 × 381 × 325 mm (19 × 15 × 12.8 in), 22.7 kg (50 lb), connected to separate inlet and outlet transformer valves | Screw onto ball valve, push sensor through valve and tighten. Electrical clearance must be considered. | Fits on 1.5 in minimum, open bore ball or gate valve | Fits on 1.5 in minimum, open bore ball or gate valve | Fits on 1.5 in minimum, open bore ball or gate valve | 224 × 195 × 218 mm (8.8 × 7.7 × 8.6 in), fits on 1.5 in bore ball or gate valve with NPT or ISO 228 thread | 224 × 195 × 218 mm (8.8 × 7.7 × 8.6 in), fits on 1.5 in bore ball or gate valve with NPT or ISO 228 thread | Screw onto ball valve, push sensor through valve and tighten. Electrical clearance must be considered. | Fits on 1.5 in minimum, open bore ball or gate valve | 227 × 229 × 333 mm (9 × 8.9 × 13.1 in), fits on 1.5 in minimum bore ball or gate valve |
| Recommended maintenance timeline | No maintenance required | No maintenance required | 4 years | 4 years | No maintenance required | No maintenance required | No maintenance required | “No scheduled maintenance due to no membrane, no sensor replacement, and no consumables or gases” | No maintenance required | No maintenance required | Not available | No maintenance required | No maintenance required |
| Warranty | 36 months | 36 months | 30 months | 30 months | 60 months | 18 months | 18 months | 24 months | 24 months | 24 months | Not available | 36 months | 24 months |
| System description | |||||||||||||
| Type of technology | Hydrogen-specific semiconductor sensor immersed directly in the oil or headspace | Hydrogen-specific semiconductor sensor immersed directly in the oil, able to take temperature, moisture and pressure readings | Membrane + TCD | Membrane + TCD | Hydrogen-specific semiconductor sensor immersed directly in the oil | Membrane + fuel cell | Membrane + fuel cell | Hydrogen-specific semiconductor sensor immersed directly in the oil | Fuel cell sensor | H2: SiO2 solid state sensor CO: fuel cell sensor | Capillary semiconductor sensors, piezoelectric actuators | Solid state sensor in oil | C2H2: tunable diode laser spectrometer (TDLS) H2: thermal conductivity detector (TCD) |
| Calibration verification | Self diagnostics, no calibration required | Self diagnostics, no calibration required | Not available | Not available | Self diagnostics | Self diagnostics every 15 days | Self diagnostics every 15 days | Once every 24 hours for 2 hours | DGA adjustment tool | DGA adjustment tool | Ambient air | Self diagnostics every 12 hours | Self diagnostics, no calibration required |
| Accuracy1 | ±20% of reading or ±25 ppm, whichever is greater | ±20% of reading or ±25 ppm, whichever is greater | ±5% | H2: ±5% CO: ±15% | ±20% or ±25 ppm | ±10%, ±25 ppm | ±10%, ±25 ppm | ±15% or ±20 ppm | ±20 ppm or 15% of reading | H2: ±25 ppm or 15% of reading CO: ±25 ppm or 20% of reading | ±10% or ±20 ppm | ±20%, ±25 ppm | H2: ±25 ppm or 15% of reading C2H2: ±0.5 ppm or 15% of reading |
| Repeatability1 | ±10% or ±15 ppm | ±10% or ±25 ppm | ±3% | H2: ±3% CO: ±10% | ±10% or ±10 ppm | ±5% or ±5% | ±5% or ±5% | ±5% or ±10 ppm | Not available | Not available | ±5% or ±10 ppm | ±10% | H2: ±10% C2H2: ±14% |
| Power requirements | 12–48 VDC, 10 W | 12–30 VDC, 12 W | 100–240 VAC +10% 100–220 VDC +10% 50/60 Hz | 100–240 VAC +10% 100–220 VDC +10% 50/60 Hz | 15–30 VDC, 24 VAC (±15%) | 90–132 VAC or 180–264 VAC, 47/63 Hz | 100/115/200/230 VAC, 50/60 Hz | 100–240 VAC, 50/60 Hz | 88–276 VAC, 50/60 Hz Option for 88–390 VDC | 88–276 VAC, 50/60 Hz Option for 88–390 VDC | 95–280 VAC, 50/60 Hz 95–280 VDC | 100–240 VAC, 50/60 Hz | AC: 90–264 VAC, 47–63 Hz DC: 105–370 VDC, 120 W |
| Gas extraction method | Sensors in direct contact with representative oil in the transformer | Sensors in direct contact with representative oil in the transformer | Low velocity pump continuously circulates oil past gas-permeable membrane tubes | Low velocity pump continuously circulates oil past gas-permeable membrane tubes | Sensors in direct contact with representative oil in the transformer | Induced convective flow over membrane surface | Induced convective flow over membrane surface | Sensor in direct contact with representative oil in the transformer | Induced convective flow over membrane surface | Induced convective flow over membrane surface | Two micropumps provide oil exchange between main body and gas extraction capillary tubes | No gas extraction. Induced convective flow over solid state sensor in oil | Induced convective flow over gas-permeable membrane surface |
- Accuracy noted is the accuracy of the detectors during the calibration process. Dissolved gas in liquid measurement accuracy may also be affected by sampling and/or fluid type. Consult with the manufacturer of the DGA monitor for further details.
Specifications subject to change without notice. Last updated August 5, 2025.