Model 421504 Version 1.9 December 2004
7
Temperature units – Degrees
o
C or
o
F
The Primary and Second display (one for each RTD input) can read in either degrees
o
C or
o
F. Press the C/F button to toggle between
o
C and
o
F temperature units. The meter
remembers the selected unit of measure the next time the meter is used.
Data Hold
To freeze the LCD display, press the HOLD button. The HOLD icon will appear on the
upper right-hand side of the LCD. Press the HOLD button again to return to normal
operation (the HOLD display icon will switch off).
MIN, MAX, AVG Function with Timer (for Primary display only)
In the MIN/MAX/AVG mode of operation the meter tracks the highest (MAX), lowest (MIN),
and average (AVG) primary display readings for easy recall.
1. To enter this mode, press the MIN/MAX button (the RECORD display icon will appear).
Use the MIN/MAX button to cycle through MIN, MAX, and AVG modes each with its
own LCD display icon.
2. Each time a new MAX or MIN is detected, the previous MAX or MIN displayed value is
replaced and an audible tone will sound.
3. Use the HOLD button to start and stop recording. When recording is stopped, the
stored values are held in meter memory until the MIN/MAX/AVG mode is exited or
resumed (resume by pressing the HOLD button again).
4. The AVG mode keeps a true running average of temperatures recorded since the
MIN/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the average stored at this point is held on the display and is no longer updated (the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 icon appears on the LCD.
6. Each value for MIN/MAX/AVG has an associated time value (bottom right) indicating
when the displayed reading was taken. Set the timer clock in the SET mode (refer to
the SET MODE section).
7. The MIN/MAX/AVG mode cancels the Auto Power OFF feature, disables most of the
meter keys, and will not allow a manual power OFF. Press and hold the MIN/MAX key
for several seconds to exit MIN/MAX/AVG mode and return to normal operation.
Relative Mode (for Primary display only)
The Relative Mode permits the user to store a temperature and compare it to subsequent
temperature readings. In Relative mode the primary display indicates the actual
temperature minus the relative temperature. The user can store the current primary
temperature reading as the relative temperature or a temperature can be entered
manually. To manually enter a relative temperature, refer to the SET MODE section.
To enter the relative mode, press the REL button; The REL icon will appear on the LCD
and the temperature display will show zero (indicating that the actual and relative
temperatures are the same). Press the REL key again to exit the REL Mode.
