Dual-Temperature Accessory - ATH4
The Fieldpiece Dual-Temperature Accessory, model ATH4, measures two temperatures simultaneously using the included k-type, wrap tab beaded thermocouples. The technology inside the ATH4 provides superior temperature compensation in rapidly changing environments commonly found while performing field service. Use the ATH4 to find Delta T and just about any temperature split you want to measure. Displays T1, T2 and T1-T2 on your Fieldpiece meter, handle or data logger. It is included with the HVAC Guide® System Analyzer to get target superheat and for the Target Evaporator Exit Temperature test. Fieldpiece offers a wide variety of k-type thermocouples for various HVAC specific applications. Use pipe clamp T/Cs with the ATH4 to check for blocked filters. Use wet and dry bulb thermocouples to find target superheat.
Converts the voltages from two K-type thermocouples to display temperature on any digital multimeter with industry standard jacks. For 0.1º resolution, use a DMM that displays 0.1mVDC. The ATH4 converts the Fieldpiece stick series meter, DL3 data logger and EHDL1 electronic handle to a one-piece dual-input temperature meter. Use the optional Fieldpiece ADLS2 deluxe silicone test leads or the AHDL1 adapter handle with the ATH4 for use with DMMs with industry standard jacks.
Insure the temperature being measured is stable. Maintain good contact between the thermocouple and what's being measured. Set the meter on 200mV or 2000mV range for 0.1º or 1º resolution respectively. Slide the switch to "T1" to measure display T1, to "T2" to display T2, and to "T1-T2" to measure the difference between T1 and T2.
Velcro Tie-wrap Instructions
Two Velcro straps have been included with the ATH4 to make it easier to measure pipe temperatures. Use the Velcro strap to hold the bead of the model ATB1 thermocouple against the pipe.
Features and Benefits
Designed for HVAC/R, the Dual-Temperature Accessory, model ATH4, measures two temperatures and calculatesthe difference in English or metric units.
- Field calibration for ±1ºF accuracy.
- Displays ºF directly at 0.1ºF resolution on DMM with 0.1mVDC resolution.
- Select ºF or ºC.
- Converts from -50ºF to 1800ºF (optional thermocouple required for 1800ºF)
- Includes two “wrap tab” thermocouples plus velcro straps. Thermocouples insulated to 400ºF.
- Auto-off can be disabled for data logging.
There are other digital thermometers and dual temperature meters our there. Ours is unique. Because of the technology we employ inside, the ATH4 offers superior temperature compensation in rapidly changing environments commonly found while performing field service. Meters with thermocouple adapters often take a long time to stabilize due to transfer of ambient heat to the adapter while in a pocket, in the back of your truck, even the heat generated while in your hand. The ATH4, as with all of our k-type thermometers and meters, stabilizes rapidly so you can take it from the rooftop to the walk-in and get more accurate readings faster than the competition.
- Dual-Temperature Accessory - ATH4
- (2) K-type wrap tab bead thermocouples - ATB1
- (2) Velcro Tie- wraps (not pictured)
- Mini-calibration screwdriver
- 9V battery (installed)
- Operator’s manual
Recommended Accessories and Replacement Parts
Technicians who like the ATH4 may also enjoy these instruments and accessories:
HVAC Guide® System Analyzer - HG1
Expandable True RMS Stick Multimeter with Backlight - HS36
Expandable HVAC/R Data Logger - DL3
Superheat and Subcooling for A/C and Refrigeration - SSX34
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
* 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).
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".