Keypad - Ahlborn THERM 2420 Operating Instructions Manual

8. Display and keypad
Special operating states and faults
Display segment test :
Supply voltage
Relative measuring with respect to a reference value :
Checksum error in
device calibration :
Sensor breakage :
Outside of measuring range, undershoots
cold junction compensation or cold junc
tion compensation breakage :
Function is locked :
Overshoots measuring range :
Undershoots measuring range :

8.2 Keypad

To operate the device a keypad with 7 keys is provided :
Function :
To switch ON the device : (see Section 6.2)
To switch OFF the device :
pressed and held down
Selecting the units : (see Section 9.2)
Displaying the maximum value : (see Section 9.3)
To delete press and hold down
Displaying the minimum value : (see Section 9.3)
To delete press and hold down
Zero-setting the measured value : (see Section 9.5)
To delete press and hold down
8 THERM 2420
runs automatically after switch ON
Display after segment test
Under 3.8 V :
Maximum value flashes
Minimum value flashes
LOBAT arrow lights up
REL arrow lights up
CALEr
NiCr
flashes
CJ
flashes
Loc
This appears
briefly
Key
ON OFF
ON OFF
or
M▲
MAX
MIN
CLR
must be
M▼