The model GM-250 is the most advanced high voltage ground monitor on the market today because:
- Pilotless or pilot wire operation.
- Continuity monitor (45 ohm trip resistance)
- Time delay (250 mS). Reduces nuisance tripping.
- Immune to high and low voltage conditions. (+10%, -30%)
- Immune to DC and AC stray currents.
- Easy installation and maintenance.
- Transient protection on all inputs and outputs.
- Approved to work with cable lengths to 10,000 feet.
- Saves cable cost and repairs.
- Only M.S.H.A. -accepted high-voltage pilotless ground monitor.
| Specifications | ||
| Dimensions: | 6″W x 7.75″H x 8.5″D | |
| (152.4mm x 196.9 x 215.9) | ||
| Weight: | 11.25 lbs (5.1 kg) | |
| Certifications: | MSHA | |
| Enclosure Rating: | Industrial Powder Coated Aluminum | |
| Main Assembly Installation: | Flush or Flange Mount | |
| Operating Voltage: | 120 VAC | |
| Current Consumption: | 250 mA | |
| Operating Temperature: | -20 to 70C | |
| Humidity: | 0 to 90% R.H. | |
| Phase Voltage Filters: | 7.2 kV, 15 kV, or 25 kV | |
| Trip Resistance: | Adjustable up to 75 ohms | |
| Trip Delay: | 250 ms | |
| Reset Mode: | Auto | |
| Transmitter Frequency: | 1000 Hz +/- 1% | |
| Transmitter Output Current: | 200 mA | |
| Outputs: | (1) Normally open or normally closed contact relay | |
| Contact Relay Rating: | Form C – 120 VAC @ 10 A or 240 VAC @ 5 A | |
| Contact Operating Mode: | Fail Safe | |
| Display: | LED Indicators, Analog Current Meter | |
| Backup Battery: | No | |
| Test Feature: | Yes | |
| Option: | Blocking Inductor – prevents parallel earth pass of signal | |
| High Voltage phase filter for pilotless operation | ||
| Warranty: | 90 Days |