ISR 12-LO • IGAR 12-LO Operating Manual Controls and Connections • 16
3.2.1 Connector pin J
The connector pin J can be used for 4 different functions:
1. Operating mode contact: During the warm-up of the pyrometer (after connection to
the power supply, the LED display on the converter indicates “7777”) pin J is connected
to the power supply voltage. This voltage is connected by a relays switch (max.
continuous current 0.4 A) to pin K (power supply voltage). This relays switch opens when
the warm-up is finished, and the pyrometer is in operating mode. For that reason, this
pin can be used as operating mode contact.
2. External clearing of the maximum value storage: When the pyrometer is in
operating mode, pin J can be used for external clearing of maximum value storage
(see section 4.8). To clear the maximum value storage, connect pin J for a short time to
pin K (power supply voltage).
The function “external clearing” is activated with the following conditions:
• Warm-up is finished (no display “7777“)
• The clear time is set to “extern“ (see section 4.8).
• The lens contamination monitoring is switched off. This can be done via software
InfraWin in “color-bar“ window. The warning level “dirty window” must be set to
0% (see section 4.1).
3. Hold function: When the hold function mode is activated the current temperature,
reading is frozen as long as J and pin K are connected (see 4.8 clear time for the
maximum value storage).
4. Lens contamination monitoring system: The pyrometers are equipped with a
contamination monitoring system. Contamination of lens or sighting window or dust in
the sighting path of the pyrometer can interfere the signal in such a high level that a
correct temperature measurement will be impossible (this can also happen if the object
is smaller than the spot size of the pyrometer). To avoid wrong measurements in
advance, a warning signal can be set to a certain contamination level. If contamination
reaches this level (or at a certain too low signal level), a built-in relay (max. continuous
current 0.4 A) connects pin J to pin K (power supply voltage). The setting of the switch
level (0 … 99%) can be done via software InfraWin in “color-bar“ window. If the
warning level “dirty window” is set to 0% (see section 4.1) the lens contamination
monitoring system is switched off and pin J has the function “external clearing” of
maximum value storage (factory setting).
The lens contamination monitoring system is activated with the following conditions:
• Warm-up is finished (no display “7777“)
• The clear time is not set to “extern“ (see sections 4.1 and 4.8).
• The pyrometer is operating in “2-color mode“ (see section 4.9)
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