41-360003/J
Temperature and Alarm Systems
A. Digital Temperature Controller
Your Helmer system incorporates a digital controller system and RTD sensor to accurately
control the temperature of the chamber. The controller system provides visual readouts of the
chamber operating temperature, alarm system, heater output, and other functions. All
temperature, calibration, and alarm settings are made through the controller touch buttons.
See Figure 2.1 in the appendix for locations of the items referenced below.
Heater On Indicator (1): This small round light labeled "1", will light whenever the
controller sends power to the heater. This indicator will light on and off continuously
during normal use.
Alarm Indicator (2): When the controller senses that the chamber temperature has
exceeded the high or low alarm limit the Alarm Indicator, labeled as "2", will illuminate.
The audible alarm is delayed for the period of time set by the Alarm Timer Delay. The
adjustable Alarm Timer Delay prevents unnecessary warnings that may be caused by
temporary temperature fluctuations when opening the doors.
Down Button (u) (3): Used to decrease the controller digit values in conjunction with
the SET button and to enter into the program functions in conjunction with the tbutton.
Up Button (t) (4): Used to increase the controller digit values in conjunction with the
SET button and to enter into the program functions in conjunction with the ubutton.
SET Button (5): Used to display the set temperature and to display the program function
values.
B. Accessing the Chamber Set Temperature
To alter the chamber temperature setting:
1) (Figure 3.1) This is the normal display of the current temperature reading.
2) (Figure 3.2) Press and hold the SET button to display the current set temperature value.
3) (Figure 3.3) While holding the SET button down, press either the tor ubutton to alter
the set value as desired. (If the set value will not change, the Set Point Lockout is in the
lockout mode. To unlock this program value refer to "Accessing the Set Point Lockout"
in the Controller Lockout section of the Maintenance and Service manual.)
4) Release the SET button to complete the chamber temperature setting change.
