HH12B
DIGITAL THERMOMETER
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INTRODUCTION
This instrument is a portable 3½ digit,
INTRODUCTION
This instrument is a portable 3½ digit,
SAFETY INFORMATION
It is recommended that you read the safety and opera- tion instructions before using the thermometer.
WARNING
To avoid electrical shock, do not use this instrument when working voltages at the measurement surface over 24V AC or 60V DC.
WARNING
To avoid damage or burns, do not make temperature
measurement in microwave ovens.
CAUTION
Repeated sharp flexing can break the thermocouple leads. To prolong lead life, avoid sharp bends in the leads, especially near the connector.
The 
symbol on the instrument indicates that the op- erator must refer to an explanation in this manual.
SPECIFICATIONS
ELECTRICAL
Temperature Scale: Celsius or Fahrenheit
Measurement Range:
Accuracy: Accuracy is specified for operating tempera- tures over the range of 18°C to 28°C (64°F to 82°F), for 1 year, not including thermocouple error.
±(0.1%rdg+1°C) on
Temperature Coefficient:
0.1times the applicable accuracy specification per °C from 0°C to 18°C and 28°C to 50°C (32°F to 64°F and 82°F to122°F).
Input Protection:
60V dc or 24V ac rms maximum input voltage on any combination of input pins.
Input Connector:
Accepts standard miniature thermocouple connectors (flat blades spaced 7.9mm, center to center).
ENVIRONMENTAL
Ambient Operating Ranges:
0°C to 50°C (32°F to 122°F) <80% R.H.
Storage Temperature:
GENERAL
Display: 3½ digit liquid crystal display (LCD) with maxi- mum reading of 1999.
Low battery indication: The “
” is displayed when the battery voltage drops below the operating level. Measurement rate: 1 time/second.
Operating environment: 0°C to 50°C at<70% R.H.
Storage temperature:
Accuracy: Stated accuracy at 23°C±5°C, <75% R.H.
Battery: Standard 9V battery (NEDA 1604, IEC 6F22).
Battery Life: 100 hours typical with carbon zinc battery.
Dimensions: 210mm(H) x 65mm(W) x 35mm(D).
Weight: approx. 292g including battery.
Supplied Wire: 4 feet type “K” thermocouple bead wire (Teflon tape insulated). Maximum insulation temperature 260°C (500°F). Wire accuracy ±2.2°C or ±0.75% of read- ing (whichever is greater) from 0°C to 800°C.
OPERATING INSTRUCTIONS
1.“°C/°F” Button: Selecting the Temperature Scale Reading are displayed in either degrees Celsius(°C) or degrees Fahrenheit(°F). When the thermometer is turned on, it is set to the temperature scale that was in use when the thermometer was last turned off. To change the temperature scale, hold down for 2 seconds “APO >2S °C/°F” key.
2.
3.Differential Temperature Measurement
Differential temperature measurement is selected by pressing the
4.“HOLD” Button
Press the “HOLD” key to enter the Data Hold mode, the “HOLD” annunciator is displayed. When HOLD mode is selected, the thermometer held the present readings and stops all further measurements. Press the “HOLD”
key again cancels HOLD mode, causing the thermome- ter to resume taking measurements.
5.“REL” Button
Press “REL” key to enter Relative mode, zero the dis- play, and store the displayed reading as a reference value and annunciator REL is displayed. Pressing “REL” key over 2 seconds to exit the relative mode.
6.“APO” Button
Pressing “APO >2S °C/°F” key to trigger on or off APO mode, and then APO annunciator will appear or disap- pear on the display. Power is automatically turn off, if no operation for a period of time, and “APO” annuncia- tor is displayed at
7.“MIN/MAX” Button
Press “MIN/MAX” once to begin recording MIN and MAX. Press “MIN/MAX” to select MIN or MAX or
In the MIN/MAX record mode can not power off, must leave MIN/MAX record mode then power off.
OFFSET ADJUSTMENT
The OFFSET control is set at the factory to allow for the variations found in standard thermocouples. By adjust- ing the OFFSET control, you can optimize measurement accuracy for a particular thermocouple at a particular temperature.
Adjusting for T1 or T2 Accurate Measure- ments
1.Connect the thermocouple to the T1 or T2 input con- nector and turn the thermometer on.
2.Place the thermocouple in a known, stable temperature environment at or near the temperature you wish to measure, and allow the readings to stabilize.
3.Slowly adjust the OFFSET control so that the ther- mometer reading matches the temperature of the known environment. Leave sufficient time between adjustments to allow for measurement lag.
4.The calibration of the
Resetting the OFFSET Control
To return the OFFSET control to the factory setting without having to recalibrate the thermometer, perform the following procedure:
1.Connect a thermocouple that is in good working order to the input that is to be adjusted.
2.Place the thermocouple in an
3.Slowly adjust the OFFSET control until the thermome- ter reads 0°C (32°F).