Fluke Thermalert 4.0 Series, User Manual, Page: 71 / 135

Thermalert
®
4.0 Series
Users Manual, Rev. 2.4, Jul 2021
72
Table 10-2: Overview to Temperature Hold Functions
Hold Function RESET by Peak Time Valley Time Threshold Hystersis
Protocol code
P F C XY
None none 000.0 000.0
Peak Hold timer 000.0-998.9 000.0 000.0
Peak Hold trigger Holds infinitely
or until triggered 000.0 000.0
Advanced Peak Hold trigger or threshold Holds infinitely
or until triggered
000.0 Temp. range -100°C to 100°C
(-180°F to 180°F)
Advanced Peak Hold timer or threshold 000.0-998.9 000.0 Temp. range -100°C to 100°C
(-180°F to 180°F)
Valley Hold timer 000.0 000.0-998.9 000.0
Valley Hold trigger 000.0 Holds infinitely
or until triggered 000.0
Advanced Valley Hold trigger or threshold 000.0 Holds infinitely
or until triggered Temp. range -100°C to 100°C
(-180°F to 180°F)
Advanced Valley Hold timer or threshold 000.0 000.0-998.9 Temp. range -100°C to 100°C
(-180°F to 180°F)
10.5 Sensor Control
10.5.1 Analog Output
The current output corresponds to the target temperature value. Depending on the considered sensor model, the
output can be set to current, voltage, or thermocouple.
XO=4 sets the current output range to 4-20 mA
H=500 sets the temperature for the top analog output value to 500 (in current scale)
e.g., the top current output value of 20 mA shall represent 500°C
L=0 sets the temperature for the bottom analog output value to 0 (in current scale)
e.g., the bottom current output value of 4 mA shall represent 0°C
The minimum temperature span between “H” and “L” command values is 20 K.
For testing purposes the output can be forced to provide a constant value.
O=50
percentage of full output range, example given with 50%
O=255 switches back to the target temperature controlled output
10.5.2 Relay Output
If existing, the relay output can be triggered as follows:
• by target temperature
• by internal sensor temperature
• manually (command controlled)
The alarm output can be set either to N.C. (normally closed: relay contacts are closed while in the home position)
or N.O. (normally open: relay contacts are open while in the home position).
K=0
relay contacts permanently open
K=1 relay contacts permanently closed
K=2 alarm output triggered by target temperature, N.O. normally open
K=3 alarm output triggered by target temperature, N.C. normally closed
K=4 alarm output triggered by internal sensor case temperature, N.O. normally open
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