Manual Irox HT78 (page 7 of 9) (English)

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5.2 THERMOMETER WITH ALARM

With regard to operation, the HT78 is in a 'sleep mode’ when no key is pressed for more than 2 minutes. This status is then

recognised by the fact that on the left-hand side of the display neither the

symbol nor the number in the channel display is

flashing. In such a case, the operation is activated by pressing one of the 3 keys. The corresponding symbol then flashes in the

field to be operated (

or ‘CH’ with corresponding number).

The HT78 measures the temperature directly and also receives the measurements of up to a maximum of 5 IROX thermo radio

sensors. Each sensor can be set to one of the channels 1-5 (resp. 1-3 for 3-channel appliances). In the two information windows

(radio sensors CH1....5 and

) the temperature currently measured is displayed in °C (or °F).

The following operations can be made in this function:

5.2.1 Reading of the temperature from each channel

Activate the CHANNEL key briefly to jump from channel to channel. The next channel is displayed with each press of the button

and activated for other operations.

The sequence of the activation is --> CH1 ---> CH2 --> CH3 --> CH4 --> CH5 --> --> CH1 --> etc

This is independent of whether a radio sensor is available in the system or not.

Note: The

measurement is always depicted in the lower window; the channels 1-5 one after the other in the middle window.

5.2.2 MIN/MAX memory

a) With the ‘MEMORY’ key you can read the Max/Min memory of the active channel by pressing it briefly (flashing symbol

or CH1 .... CH5). The corresponding MIN/MAX value is displayed together with the date and the time of the recording (‘time

stamp'). Each value will appear for approx. 4 seconds in the following sequence on the display:

- Maximum (=highest) temperature ‘MAX’

- Minimum (=lowest) temperature ‘MIN’

- Back to display of the current measurement

The sequence can also be made manually by pressing the MEMORY key.

All values shown have been recorded since the last memory reset. If no data are available, lines appear.

b) Reset of the MIN/MAX memory

If you hold the CLEAR key pressed for approx. 3 seconds, the MIN/MAX memory values of the active channel (flashing

symbol

or CH1 .... CH5) are reset to the current value. The recordings of the other channels remain.

5.2.3 Measurement unit °C or °F

You can change the unit of temperature from °C to ° F (see Chapter 2.2). The setting on the display appliance or the sensor is

to be made independent of one another and only affects the display of the corresponding device.

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Irox HT78 Manual

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