C.B.S. Scientific TTGEK-2401-220 - Manual (Page 13)

TTGE Instruction Manual, version 8/30/2011
13
www.cbsscientific.com
3.2 Heater/Stirrer Set-Up and Programming – continued
3.2d Circulator Location
Locate the Circulator on a level surface, free from drafts and out of direct sunlight. Do not place it where corrosive
fumes, excessive moisture, high room temperatures, or excessive dust are present.
Refrigerating/Heating Circulators must be a minimum of four inches (102mm) away from walls or vertical surfaces so
air flow around the unit is not restricted.
To help prevent voltage drops, position the Circulator as close as possible to the power distribution panel and a
properly grounded outlet. The use of an extension cord is not recommended.
Warning: These units are equipped with over-temperature protection (Safety Set). A low liquid level or failure to set
the Safety Set and properly immerse the heater may result in heater burnout and triac failure. While operating, do not
allow the heater to contact any potentially flammable materials, such as plastic racks or the sides of plastic tanks, as
a fire hazard may result.
3.2e Reservoir Liquid Level
Fill the reservoir with the appropriate buffer. On circulating baths, the liquid level should be sufficient to cover the
heating coils, cooling coils (if applicable), pump, over-temperature sensor, and at least one inch (25mm) of the
temperature sensor. The level should be at the fill line indicator on the tank.
After filling the reservoir with fluid, you must set the Safety Set and the Limit High value as well as your desired
control set point temperature.
3.2f External Temperature Probe
The Programmable Controller is designed to accommodate an optional remote temperature probe. The probe
attaches to the 9-pin male D-connector on the rear panel of the Controller.
NOTE: On Digital Controllers, this connection is present, but not functional.
The Controller will automatically sense the presence of the external probe when main power (rear panel circuit
breaker/power switch) is turned On. To control temperature using the external probe, “External” must be selected via
the Controller’s software. You must also set a Maximum Setpoint Differential value.
To attain better temperature uniformity when using the external temperature probe in a jacketed or air-filled vessel,
stirring the external fluid with pumps or mixing air with fans is recommended. Expect only ±1.0°C stability with air or
any medium that does not conduct heat well. Insulate and cover the entire set-up to remove temperature gradients;
the Controller cannot compensate for external chamber or component temperature gradients.
3.2g RS232 Interface
Programmable and Digital Controllers incorporate an RS232 interface to provide remote data-logging and control
capability. Remote control capability is available on the Programmable Controllers only. The 9-pin female RS232
connector is located on the rear panel of the Controller.
The RS232 interface should be connected to a serial communication port on a remote PC using an appropriate cable.
Communications software compatible with Microsoft
® Excel and National Instruments LabView™ are provided with
Programmable Controllers. Contact Technical Service at C.B.S. Scientific [email protected]