Wahl TM-500 Thermocouple Thermometer Instruction Manual

Wahl TM-500 Thermocouple Thermometer Instruction Manual

INTRODUCTION

The Wahl Model TM500 digital thermometer is designed to accept both types K & J thermocouples in either input and can display the temperatures from each independently of the other. To get the maximum benefits from the features of this instrument please read these instructions carefully.

WARNING

TO AVOID ELECTRICAL SHOCK DO NOT USE THIS INSTRU- MENT WHEN WORKING VOLTAGES AT THE MEASUREMENT SURFACE ARE OVER 24V AC OR DC.

Do not use this instrument to take temperature measurements in microwave ovens.

OPERATION

The TM500 has three operating modes: NORMAL, MIN/MAX RECORD- ING and SET.

The instrument will be in normal mode when it is first switched on which will permit you to read temperatures, select inputs T1, T2, switch thermo- couple types and activate/deactivate the Relative, Hold, Time and Alarm features.

MIN/MAX mode records and stores data which will give you Minimum and Maximum temperatures as well as the average temperature over a period of time. To protect this data the Power Switch and Auto-Off feature are disabled when the instrument is in MIN/MAX RECORDING mode. TO SWITCH THE INSTRUMENT OFF YOU MUST EXIT MIN/MAX MODE (see instructions below).

SET mode allows you to enter a reference temperature for use with the Relative function in normal mode, to set the time and enter high and low alarm points. ALL FUNCTIONS ARE DISABLED UNTIL YOU EXIT SET MODE (see instructions below).

The LCD will display”” if there is no probe inserted in the relevant input or if the probe inserted is broken.

POWER SWITCH

Press the power switch once to turn the instrument on. All segments of the LCD will display briefly to ensure correct functioning. To prolong battery life the instrument will automatically switch itself off when in normal mode approximately 30 minutes after the last key has been pressed.

Note: When the instrument is in MIN/MAX RECORDING or SET modes the power switch and Auto-Off feature are disabled to prevent inadvertent loss of data. You must exit MIN/MAX RECORDING or SET modes before switching instrument off

DEGREES C/ DEGREES FC/F

Temperature readings are displayed on both Main Display and Second Display in either Celsius or Fahrenheit. Press the C/F key to switch the instrument from one scale to the other.

HOLD HOLD

The temperature displayed on the Main Display can be held by pressing the Hold key. The “HOLD” annunciator on the LCD will be displayed. Press the key again to release the Hold feature and resume registering current tempera- tures. When the instrument is in MIN/MAX RECORDINGmode the Hold feature will stop the recording without deleting any data. Recording will recommence when the Hold key is pressed again.

T1, T2, T1-T2 MAIN DISPLAY

The Main display will show the temperature from the thermocouples inserted in either input (T1 or T2) or the difference between them (T1-T2). Each press of the key will advance the display one step through the sequence T1, T2, T1-T2. The Main Display will default to TI when the instrument is switched on.

K/J

When the Main Display is set for T1 the K/J key can be used to select either Type K or Type J thermocouples for input T1. The thermocouple type selected will be displayed on the LCD to the left of the temperature on the Main Display.

MIN/MAX RECORDING MODE

When operating in the MIN/MAX mode the instrument will record maximum and minimum temperatures measured during the period of recording, and calculate the average temperature during the first 22 hours of recording. Press the MIN/MAX key once to start recording. The instrument will beep every time a new maximum or minimum is registered. Each press of the MIN/MAX key will advance the display through the sequence MAX, MIN, AVG and the appropriate annunciator will appear at the top of the Main Display. The Third Display will display the time or how long into the recording session the maximum and minimum temperatures occurred (see SET). Although the instrument continues to record maximum and minimum temperatures it will only hold data for the first 22 hours of recording; after this time it will retain the last calculated average and display this value. In the event a temperature is sensed beyond the range of the instrument the averaging function will stop and “..” will be displayed as the average value.

To stop recording press “Hold”. All recorded values will be retained in memory. Press “Hold” again to restart recording. TO EXIT MIN/MAX RECORDING MODE PRESS AND HOLD THE MIN/MAX KEY FOR TWO SECONDS UNTIL YOU HEAR A BEEP. THE INSTRUMENT WILL

RETURN TO NORMAL MODE, AND ALL RECORDED DATA WILL BE ERASED FROM MEMORY.

RELATIVE DISPLAY FREL

When the “REL” key is pressed the instrument will register the temperature at the time of pressing the key and the Main Display will show the difference + or between the stored reference and the actual temperature at the sensor. Press the “REL” key again to return to normal display.

SEC./MINU. TIME SCALE

The third display on the LCD shows the elapsed time from the moment the instrument is switched on. Press the “Sec./Minu.” key to alternate this display between hours/minutes and minutes/seconds. The maximum time displayed is 100 hours.

SET SET

The SET mode will allow you to enter:

• Any temperature as a stored reference for the RELATIVE mode.
• The time in hours, minutes and seconds for use in MIN/MAX recording
• High temperature alarm points
• Low temperature alarm points

Press the “SET” key and the instrument will enter the first step of the SET programs which permits you to enter a reference temperature for use in the RELATIVE mode. “REL” will be displayed at the top of the LCD, the Main Display will show “”. Enter the reference temperature using the buttons corresponding to the numbers printed above the buttons; use 0 to delete spaces to the left of the first digit, i.e. a temperature of 12.0° would be entered by pressing 0,0,1,2,0. The Main Display would now show 12.0. Press “ENTER”. The instrument will now advance to the second “SET” program -Time Set.

In the Time Set program the Main Display will show ” and the Second and Third displays will show “o”. Enter the time in hours, minutes and seconds using the 0 key to delete any space to the left of the first digit, i.e. a time of 1:53 would be entered 0,1,5,3,0,0. Press “ENTER”. (The display will show minutes and seconds until changed by pressing the “Sec. Minu.” key in normal mode.) The instrument will now advance to the third “SET” program – High Temperature Alarm Set.

In the High Temperature Alarm Set program the Main Display will show and the Alarm annunciator will be displayed in the top right corner of the LCD. Enter the High Alarm Temperature, using the 0 key to delete spaces to the left of the first digit, i.e. a temperature of 155.6° would be entered 0,1,5,5,6. Press “ENTER”. The instrument will now advance to the fourth and final “SET” program – Low Temperature Alarm Set.

In the Low Temperature Alarm Set program the Main Display will show = and the Alarm annunciator will be displayed in the top right corner of the LCD. Enter the Low Alarm Temperature, using the 0 key to delete spaces to the left of the first digit, i.e. a temperature of 37.6° would be entered 0,0,3,7,6. Press “ENTER”. The instrument will now return to normal mode and the temperature values entered will be retained in memory until changed, even after the instrument is switched off.

NOTE: TO SKIPANY PROGRAM PRESS “ENTER” TO ADVANCE TO THE NEXT STEP WITHOUT ENTERING ANY VALUES.

With the instrument in normal mode, press “REI.” then “SET” keys to display the Relative temperature against the reference temperature set in memory.

Press the “Hi/Lo LIMITS” key to activate the alarm. The instrument will beep when either alarm is exceeded. Press the key again to deactivate the alarm.

T1, T2, T1-T2 (SECOND DISPLAY)

The second display on the LCD will show the temperature for the thermo- couple inserted in either input (T1, T2) or the difference between them (T1 – T2). Each press of the key will advance the second display one step through the sequence T1, T2, T1-T2. The second display will default to T2 when the instrument is switched on.

K/J (SECOND DISPLAY)

Press this key to select thermocouple type (K or J) for the input displayed on the second display.

HI/LO LIMITS

Press this key to activate the alarm function. When activated the alarm annunciator appears in the top right corner of the LCD.

BATTERY REPLACEMENT

Replace the battery when the battery annunciator is displayed in the top left corner of the LCD.

SPECIFICATIONS

• Temperature Scale:
  User switchable from Fahrenheit to Celsius

• Measurement Range:
  Type J: -200°C to 1050°C/-328°F to 1922°F
  Type K: -200°C to 1370°C/-328°F to 2498°F

• Resolution:
  0.1 Degree Celsius or Fahrenheit

• Accuracy:
  At ambient temperatures of 18°C to 20°C/ 64°F to 82°F
  +/-0.05% rdg +0.3°C from -50°C to 1370°C
  +/-0.05% rdg +0.7°C from -50°C to -200°C
  +/-0.05% rdg +0.6°F from -58°F to 2498°F
  +/-0.05% rdg +1.4°F from -58°F to – 328°F

• Temperature Coefficient:
  0.1 times the applicable accuracy specifica- tion per Degree C from 0°C to 18°C and 28°C to 50°C (32°F to 64°F and 82°F to 122°F)

• Input Connector:
  ANSI mini connector

• Input Protection:
  24V DC or 24V AC rms maximum input voltage on any combination of input pins.

• Voltage Differential:
  Maximum voltage between T1 and T2 during measurement is 1 volt.

• Ambient Operating Range:
  0°C to 50°C (32°F to 122°F) <80%RH

• Storage Temperature:
  -20°C to 60°C (-4°F to 140°F) <70%RH

• Display:
  5 Digit Liquid Crystal Display

• Battery:
  One standard 9V (NEDA 1604 or equiva- lent)

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