Fieldpiece ATH4 User Manual

Dual Temperature
Accessory Head
Model: ATH4

Description

Converts the voltages from two K-type thermo­couples to display temperature on any digital multi­meter with industry standard jacks and input imped­ance of 9 or 10 MOhms. 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.

EHDL1 AHDL1w/DMM DL3 “Stick”

Operation

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.

Optional K-type thermocouples

Fieldpiece offers many k-type thermocouples that
can be used with the ATH4. ATB1 is the included
thermocouple, ATA1 is the ATB1 with an alligator
clip, ATAF1 is a high temperature ATA1, ATWB1 is
for wet bulb, ATF1 is 6” (15cm) for fluids, ATP1 is for
piercing semi solids, ATEXT10 is a 10’ (3m) exten­sion, and the ATC3 is a premium pipe clamp.

ATWB1 ATF1

ATAF1 ATP1

ATA1 ATEXT10

ATC3

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.

1. 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.

2. Select mVDC range.

3. Immerse one probe in ice water and let it stabi-

lize.

4. Slide the switch to "T1" and adjust the "T1" cali-

bration pot on the face of the converter to dis-

play 31.3 on the DMM for optimum accuracy at

room temperature.

5. Repeat steps 3 and 4 for "T2".

Warranty

The product is warranted to the original purchas­er against defects in material or workmanship for a
period of one (1) year from the date of purchase.
During the warranty period, Fieldpiece Instruments
will, at its option, replace or repair the defective unit.

This warranty does not apply to defects resulting
from abuse, neglect, accident, unauthorized repair,
alteration, or unreasonable use of the instrument.
Any implied warranty arising out of the sale of
Fieldpiece's products including but not limited to
implied warranties of merchantability, and fitness for
purpose, are limited to the above. Fieldpiece shall
not be liable for incidental or consequential dam­ages.

Service

Return any defective ATH4 to Fieldpiece for war­ranty service along with proof of purchase. Contact
Fieldpiece for out of warranty repair charges.

Specifications

Inputs: Two K-type thermocouples
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 con-

verter 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).

OPERATOR’S MANUAL

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