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Model 421504 Version 1.9 December 2004 

SET MODE Programming 

 

 

Manually setting the Relative Values

 

Press the SET button once and the display will show all dashes "======". Enter the 
relative value using the meter's buttons which double as numerical keys. Once the 
Relative value is entered, press the ENTER key FOUR times to return to normal 
operation. Now when the Relative Mode is activated, the Meter will display Actual 
Temperature minus Relative Temperature. Refer to the Relative Mode section for more 
details. 

 

 

Setting the Timer/Clock 

1. To enter this mode, press the SET button and then the ENTER button. 

2. Program the Hours, Minutes, and Seconds (HH:MM:SS) using the overlay numeric 

buttons. 

3. Press the ENTER button three times to return to normal meter operation. The clock 

will begin running. 

 

 

Alarm HI/LO Limit Programming 

1.  Press the SET button once and then the ENTER button twice. 

2.  Program the desired HI Alarm value (temperature at which the meter will audibly 

alert the user) using the overlay numerical keys (alarm values are four number 
digits; 80° should be entered as 0080; 100° as 0100, etc.). 

3.  Press the ENTER button once. 

4.  Program the LO Alarm Limit value (temperature at which the meter audibly alerts the 

user). 

5.  Press the ENTER button once to return to normal operation. The alarms will be 

armed giving an audible alert when a limit is reached. 

6.  When the actual temperature meets or exceeds the user programmed temperature 

limits a continuous alert tone will be heard. Press the HI/LO Limits button to silence 
the alarm when it audibly trips.  

Automatic Power OFF 

The meter is equipped with an automatic power off utility. After 30 minutes the meter 
automatically shuts off unless the meter is in the SET, RELATIVE, or MIN/MAX/AVG 
mode. Note that in the SET, RELATIVE, and MIN/MAX/AVG modes the meter cannot be 
shut off manually either; exit these modes before attempting to turn the meter OFF. 

Battery replacement 

When the low battery indicator appears (or when the LCD does not switch on when the 
POWER button is pressed), replace the 9V battery. 

1.  Remove the rubber protective meter jacket 

2.  Remove the two Phillips screws and remove the battery compartment cover 

3.  Replace the 9V battery and reassemble the meter. 

 

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com

 

Summary of Contents for 421504

Page 1: ...put RTD Thermometer Model 421504 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com 99 Washington Street Melrose MA 02176 Fax 781 665 0780 TestEquipmentDepot com ...

Page 2: ...5 RTD Probe Pt 3926 100Ω 328 to 1166 o F 200 to 630 o C U S curve Alpha 003926 Temperature units Selectable C or F temperature units Accuracy is specified for operating temperatures in the range of 64 to 82 o F 18 to 28 o C for a period of one year not including the RTD probe error 0 05 rdg 0 2 o C for o C Scale Accuracy 0 05 rdg 0 4 o F for o F Scale Temperature Coefficient Multiply the applicabl...

Page 3: ...robe inputs 2 LCD multifunction display 3 Keypad 4 Protective holster Note that the tilt stand and battery compartment are located on the back of the meter Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com ...

Page 4: ...Model 421504 Version 1 9 December 2004 5 Display Description Keypad Description ...

Page 5: ... type alpha 3850 or 3926 that is connected to the T2 terminal using the Pt385 3926 button the button with the number 0 overlay 3 The LCD display indicates which alpha curve is selected Note Alpha curve 385 is the DIN IEC worldwide current standard while Alpha 3926 is an older standard If unsure check with the Probe manufacturer If still in doubt use the 385 selection The meter remembers the select...

Page 6: ... MAX button was first pressed up to a maximum of 22 hours If 22 hours elapse the average stored at this point is held on the display and is no longer updated the MIN and MAX functions continue without interruption indefinitely If an overload is recorded the AVG function is halted and the AVG display shows 5 In this mode the Primary displayed value is the MIN MAX or AVG reading depending upon which...

Page 7: ...ered as 0080 100 as 0100 etc 3 Press the ENTER button once 4 Program the LO Alarm Limit value temperature at which the meter audibly alerts the user 5 Press the ENTER button once to return to normal operation The alarms will be armed giving an audible alert when a limit is reached 6 When the actual temperature meets or exceeds the user programmed temperature limits a continuous alert tone will be ...

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