Bedienungsanleitung Irox HT78 (Seite 8 von 9) (Englisch)

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5.2.4 Temperature alarm

The temperature alarm function is programmed individually per channel ( / CH1.... CH5). Each alarm is defined by an upper

and lower limit. If this is exceeded or undercut, an acoustic and optical alarm is triggered.

Important general information about the thermo alarm:

- An alarm programmed on Channel 1 can only be triggered by the sensor 1. Each channel thus has its own alarm range.

- The temperature alarm can be set in steps of 0.5 ° C (0.9° F).

- So as not to trigger any permanent alarm with minor changes around the alarm limits, the alarm trigger has a hysterisis of

0.5° C (0.9° F). I.e. if an alarm has been triggered, the new measurement value must fall under the alarm value by at least 0.5°

(0.9° F) to switch off the active alarm automatically.

Example: An HI alarm at 24° first has to be set to inactive when it reaches 23.5° C again. This prevents the measurement

around a certain point triggering an alarm permanently.

- Only one alarm can be programmed if really only one sensor resp. one measurement is available at this point. Should e.g. no

sensor be available on Channel 4 or 5, lines appear there instead of a temperature and the programming as described above

cannot be done.

Activation/deactivation of the temperature alarm

1. Press the CHANNEL key until the desired channel display ( / CH1.... CH5) flashes.

2. Press and now hold the °ALARM key for approx. 3 seconds until HI--.-°C appears in the display.

3. You can now switch on the alarm with the SET key. When set for the first time, HI 30.0 °C (HI 86.0°F) will appear with a

symbol

. The number in the triangle refers to the channel for which the alarm is active. Another pressing of the SET key

switches the alarm off again. Continue to the lower limit (LO) with the °ALARM key. An operation must be done within

approx. 6 seconds otherwise the appliance automatically jumps back into the normal display.

4. If you want to change the value, please now hold the SET key pressed for at least 3 seconds until the alarm limit starts to

flash. With the + and – keys you can now change the limit in steps of 0.5° C (0.9°F) upwards or downwards. Continue to

the setting of the LO limit (lower limit) with the SET key. If you do not press any key in this setting for more than 2 minutes,

the appliance will automatically jump back into the normal display.

5. The setting of the lower limit is done in an analogous manner to steps 3 and 4. The specification at the LO limit is 5° C (41°

F). But instead of moving from HI to LO, you simply move with the next step back into the normal display.

Note 1: The HI limit can be set below the LO limit or the LO above the HI respectively. The logics of the alarm activation are

retained, namely:

- Triggering of the HI alarm when the limit is exceeded bottom-up.

Example: With an alarm of 38° C, the alarm is triggered when the measurement value jumps from 36.6° C to 38.2° C.

- Triggering of the LO alarm when the threshold is undercut top-down.

Example: With an alarm of 6° C, the alarm is activated when the measurement value of 7.2° jumps to 5.5° C.

Note 2: If you want an alarm, both a HI and a LO limit need to be set. If you only want one of these, simply set the limit you don’t

need to the extreme (HI = 70°C or 76.8° F / LO = -50° C or -58° F).

Note 3: You can programme independent alarms for each channel.

Acknowledgement of an alarm

If an alarm limit is exceeded, an acoustic alarm sounds out for approx. 2 minutes and the symbols belonging to the channel (

and the HI or LO display) flash.

During the 2 minutes of acoustic alarm, the measurement value remains on the measurement value that triggered the alarm.

You have to acknowledge the alarm with any key. Until you have done so, a short ‘beep-beep’ will sound out every minute once

the 2 minutes of acoustic alarm are over.

The current measurement value is displayed again on the display after the 2 minutes have ended or manual acknowledgement

has been given; however, the symbols flash for as long as the alarm is still ‘active’ in a slightly more sedate rhythm.

Please read the note on hysterisis at the beginning of this chapter.

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