Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc.
Global Water 800-876-1172 • globalw.com The model 378 is a high performance industrial grade digital indicating single set point PROPORTIONAL /ON - OFF controller for use with type K, J ,T and E thermocouple. Thermocouple gain and cold junction are automatically compensated by internal electrode circuits. An accurate 1 mV per display count analog is provided to interface the instrument with a recorder, printer, and so on. Table of Contents I) II) III) IV) V) VI) VII) VIII) IX) X) XI) XII) Inspection.....
Global Water 800-876-1172 • globalw.com I) Inspection a) Your 378 TEMPERATURE CONTROLLER unit was carefully inspected and certified by our Quality Assurance Team before shipping. If any damage has occurred during shipping, please notify Global Water Instrumentation, Inc. and file a claim with the carrier involved. II) Specifications Model 378KC 378KF 378JC 378JF Type K K J J On/Off control Hysteresis: Range 0 to 1000°C 0 to 1999°F 0 to 550°C 0 to 1000°F Resolution 1°C 1°F 1°C 1°F Accuracy ± 0.
Global Water 800-876-1172 • globalw.com III) Mounting procedure a) Make a cutout on any panel, with a thickness of 1/16 inch (1.5mm to 3/8 inch (9.5mm)). Refer to drawing 1. b) Remove the mounting brackets assembly from the panel meter and insert the panel meter into the cutout. Refer to drawing 2. c) Replace the mounting brackets assembly onto the panel meter and fasten the mounting screws to secure the panel meter to mounting panel .Refer to drawing 3.
Global Water 800-876-1172 • globalw.
Global Water 800-876-1172 • globalw.com IV) Wiring diagram a) Connect the AC line to the rear of the instrument. The model 378 can be used with 115/230 VAC 50/60Hz, refer to drawing 4. b) Connect the two thermocouple leads to the rear of the instrument .Be sure to observe the correct polarity of the thermocouple leads. Refer to drawing 4. V) Analog voltage output a) The analog voltage output can be used to interface with instruments such as recorder, printer, remote indicator, 4 to 20 mA converter, etc.
Global Water 800-876-1172 • globalw.com VII) Bandwidth adjust a) Set the B.W. adjust control on the front panel to the desired Proportional Bandwidth. The controller action will be On-off when the B.W. adjust control is fully counter clockwise. Refer to drawing 5. VIII) Controller set and reset a) Press the Set point switch on the front panel. The meter indicates the temperature value of the set point. Refer to drawing 5. b) Adjust the Set control on the front panel for the desired temperature value.
Global Water 800-876-1172 • globalw.com d) The process temperature may settle at any value within the proportional band. e) Adjust the Reset control clockwise if the process temperature is less than the set temperature. The Reset control is disengaged for On/off control. f) Repeat Step 5 (e) until the process temperature is equal to the set temperature. IX) Relay and front panel led format a) Connect the heater circuit to the N.O. and COM terminals of the relay.
Global Water 800-876-1172 • globalw.com XI) Trouble Shooting Other issues a) Call us for tech support: 800-876-1172 or 916-638-3429 (many problems can be solved over the phone). Fax: 916-638-3270 or Email: globalw@globalw.com. Be prepared to describe the problem you are experiencing including specific details of the application and installation and any additional pertinent information.
