Alarm - TESTO 454 Instruction Manual

8.6.6 Alarm

testo 454 offers two alarm outputs whose trigger criteria, separated from each other, can
be defined in the menu "D ", submenu "A
EVICE
measuring program is running or not running. The alarm outputs are electrically isolated
from the usual wiring parts in the testo 454 but are connected to one another.
Please use the cable 0554.0012 available as an accessory. The alarm output is switched
through and remains active as long as one of the following alarm criteria applies. The gra-
dient is the exception which remains active if once activated and can only be switched off
manually ("Alarm off").
Device Alarm off
Auto-Off øverrun
Im.rate K1: °C
Ein Ein
Enter / Enter /
On On
ålarm I +123.4
Alarm off
¨nderrun
K1: °C
Ein
Enter /
+123.4 On
Alarm off
©radient
K1: °C
Ein
Enter /
15.00 On
Alarm off
∂ifference
K1: °C-K1
Ein
Enter /
On
38.00
8
". The alarm is controlled when the
LARM
Select an alarm criterion:
Overrun
The alarm is triggered when the parameter measured
value, defined by you, overruns on a specified chan-
nel. An intermediate rate is recommended to check
the alarm criterion frequently (see Chapter 8.6.5).
Underrun
The alarm is triggered when the parameter measured
value, defined by you, underruns on a specified
channel. An intermediate rate is recommended to
check the alarm criterion frequently (see Chapter
8.6.5)
Gradient
The alarm is triggered once the measured value of a
specified parameter in the defined channel changes
quicker than that of the limit value defined by you.
The specified value refers to::
∆ t = 1 s
∆ <w>
∆ t
Difference
When a differential value (of a parameter) in two of
the channels specified by you has been overrun the
alarm is triggered.
Confirm your selected alarm criterion with <Enter>.
Main menu
8.6 Device
27