| Outputs |
Switchable: T1, T2, T1-T2, standard male banana plugs |
| Calibration |
Two externally adjustable pots |
| Conversion rate |
1mVDC per 1º |
| Range |
-50 to 1800ºF (-46 to 982°C) |
| Resolution |
0.1º for meters with 0.1mVDC |
| Battery |
Standard 9V |
| Battery life |
200 hours continuous |
| Auto-off |
After 15 minutes |
| LED indication |
green for "On", red for low battery |
| Max input voltage |
60 VDC, 24 VAC |
| Strong RF fields can adversely affect the converter performance. |
| Operating temp |
-30 to 120ºF (-34 to 49°C) |
| Storage temp |
-4 to 140ºF (-20 to 60°C) |
| Probe insulation |
Teflon, to 500ºF (260°C) |
| System accuracy* |
at 75ºF ± 5ºF (24°C ±3°C) ambient, after ice bucket calibration:
±1ºF, -50 to 165ºF (±0.5°C, -46 to 73°C)
±2ºF, 165 to 350ºF (±1°C, 74 to 176°C)
±3ºF, 350 to 1700ºF (±2°C, 176 to 926°C) |
| Converter accuracy |
±0.5%+3.6ºF (2°C), -50 to 1800ºF (-46 to 982°C) |
| Thermocouple accuracy |
±4ºF (±2°C) or ±0.75%, whichever is greater, -30 to 1500ºF (-34 to 815°C) |
| * To calculate system accuracy from components, add up the accuracy specifications for the meter, the thermocouples, and the converter. For example, at 100ºF(38°C), add the accuracies for a DMM(±1ºF/ ±0.5°C), a thermocouple (±4ºF/ ±2°C), and the converter (±4ºF/±2°C). The system accuracy for these individually calibrated components is ±9ºF(±4.5°C). If the actual temperature was 100ºF(38°C), the meter could read as high as 109 (42.5) and as low as 91 (33.5). By contrast, after a simple "ice bucket" system calibration, the meter would read between 101.0 (38.5) and 99.0 (37.5). |
| Field calibration |
To calibrate the system (ATH4 converter, thermocouple, meter), adjust the calibration pods on the face of the converter while measuring a known temperature. Ice water is very close to 32°F (0°C) and is readily available. This eliminates the accuracy stack-up which results from calibrating each component separately. Accuracies of one degree or better are easily obtained.
- Stabilize a large cup of ice water. Stir or shake while it is stabilizing. Pure distilled water will be the most accurate, but tap water is nearly as good. A stabilized mixture of ice and water is very close to 32ºF (0°C), even after considering altitude and contaminant variations.
- Select mVDC range.
- Immerse one probe in ice water and let it stabilize.
- Slide the switch to "T1" and adjust the "T1" calibration pot on the face of the converter to display 31.3 on the DMM for optimum accuracy at room temperature.
- Repeat steps 3 and 4 for "T2".
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