Differential Temperature Measurement; Hold Mode - MasterCool 52228 Instrucciones De Operación

5.

DIFFERENTIAL TEMPERATURE MEASUREMENT

Differential temperature measurement is selected by pressing the T1 – T2 button. This causes
the thermometer to display the temperature difference between the two thermocouples (the temperature of ther-
mocouple T1 minus the temperature of thermocouple T2). If either thermocouple is unplugged or open-circuited,
the thermometer displays an error. To return to single-thermocouple temperature measurement, press the T1 or T2
button.
NOTE: In T1 – T2 mode, the incorrect value (or flickering) will occur when either T1 input or T2 input is without the tem-
perature probe/open circuit. Please check T1 and T2 function to make sure the T1 and T2 are in normal
condition before proceeding to the T1-T2 mode.
WARNING!
To avoid electrical shock, DO NOT use this instrument when voltages exceed 24V AC or 60V DC. The probe tip is
electrically connected to the output terminals.
6.

HOLD MODE

Pressing the HOLD button selects the HOLD mode. When HOLD mode is selected, the thermometer stops all further
measurements. Pressing the HOLD button again cancels HOLD mode, causing the thermometer to resume taking
measurements.
OPEN THERMOCOUPLE INDICATION (Error Indication)
T1 or T2 Mode
The higest digit of (1) is displayed if any of the following conditions occur:
1. If no thermocouple is plugged into the thermocouple input connector.
2. If the thermocouple connected to the input is broken or open-circuited.
T1 – T2 Mode
If no thermocouple is plugged into the thermocouple input connectors, the thermometer
will display 000.
RECALIBRATION PROCEDURE
The thermometer should be calibrated once a year to ensure its accuracy is within specifications. The required equip-
ment is listed below:
1. 0ºC adjust VR0
2. OUTPUTS Sign 0.0mVDC adjust VR4 (at 0ºC)
3. 0ºF adjust VR2
4. 952ºF adjust VR3
5. OUTPUTS Sign 952mVDC adjust VR5 (at 952ºF)
6. 511ºC adjust VR6
SPECIFICATIONS
1. ELECTRICAL
• Measurement Range: -50ºC to1300ºC (-50ºF to 1999ºF)
• Resolution: 1ºC (1ºF)
• Maximum Voltage at Thermocouple Input: 60V DC, 24V AC
• RF Field Derating: Strong RF fields can adversely affect measurement accuracy.
ENVIRONMENTAL
• Operating Temperature and Humidity: 0ºC to 50ºC (32ºF to 122ºF), 0 – 80%RH
• Storage Temperature and Humidity: -10ºC to 60ºC (14ºF to 140ºF), 0 – 70%RH
• Basic Accuracy: @23 ±5ºC Calibration
Accuracy is ±(...% of reading +...degree) at 18ºC to 2ºC (64.4ºF to 82.4ºF) with relative humidity up to
80% for single-thermocouple measurements.
Function
ºC -50ºC
300ºC
ºF -50ºF
1999ºF
For T1-T2 Measurements, accuracy is: ±03% T1-T2 reading ±3ºF, (±03% T1-T2 reading ±2ºC)
NOTE: The basic accuracy specification does not include the error of the probe. Please refer to the "probe accuracy
specification" for additional details.
Resolution Range
-50ºC ~ 500ºC
1ºC 501ºC ~ 1200ºC
1201ºC ~1300ºC
-50ºF ~ 1000ºF
1ºF
1001ºF ~ 1999ºF
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Accuracy Output Signal
±(0.3% + 1ºC)
±(0.5% + 1ºC) ±(0.75% + 2mV)
±(0.75% + 1ºC)
±(0.3% + 2ºF)
±(0.75% + 5mV)
±(0.5% + 2ºF)
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