BROOKFIELD MODEL 75 TEMPERATURE CONTROLLER Operating Instructions Manual No. M/98-205-A0100 SPECIALISTS IN THE MEASUREMENT AND CONTROL OF VISCOSITY BROOKFIELD ENGINEERING LABORATORIES, INC. 11 Commerce Blvd., Middleboro, MA 02346 USA TEL 508-946-6200 or 800-628-8139 (USA excluding MA) FAX 508-946-6262 INTERNET http://www.brookfieldengineering.com Brookfield Engineering Labs., Inc. Page 1 Manual No.
Contents I. INTRODUCTION .................................................................................................. 3 II. SPECIFICATIONS ................................................................................................ 3 II.1 Power ............................................................................................................. 3 II.2 Controller ....................................................................................................... 3 III. INSTALLATION .....
I. INTRODUCTION The Model 75 Temperature Controller is part of the Brookfield Thermosel accessory to allow for viscosity measurements at elevated temperatures. The unit includes a solid state proportional temperature controller, a means for entering the desired temperature setpoint and appropriate status indicators. The front panel is used to display and enter setpoint temperatures. The front panel also presents the status of the system (e.g. the current temperature of the Thermosel and any error messages).
Thermosel Container Thermosel Container Specifications Range Accuracy above ambient to 300°C/572°F ±0.5% of the controller setpoint TABLE 4 III. INSTALLATION Plug the RTD Temperature Probe (DVP-94Y) into the “probe” receptacle, the Thermo Container into the “Thermosel” receptacle, and a strip chart recorder (if used) into the recorder jack. The rear panel will appear as follows in Figure 1. OFF ON Thermosel F U S E Probe Recorder Power Input Figure 1 III.
The temperature corresponding to any intermediate output voltage can be obtained from the following: (0.1 x mV) - 100 = °C (Centigrade Temperatures) (0.18 x mV) - 48 = °F (Fahrenheit Temperatures) For example, the temperature corresponding to a reading of 2.5 V (2500 mV) would be calculated as follows: (0.1 x 2500) - 100 = 150°C or (0.18 x 2500) - 148 = 302°F The recorder jack is a standard 1/4" phono jack. An analog output cable (Brookfield Part No. HT-88Y) is provided with the Model 75 Controller.
IV. CONTROL KEYS AND DISPLAY PANEL The front panel of the unit which includes all user controls and status indicators is shown in Figure 2: Temperture Controller °F °C RUN RUN HEAT SET STBY Figure 2 The digital display is used to set temperature values, to show system status during operation and to present certain messages to the user. The allowable range for temperature entries is from 0°C to 300.0°C (32.0°F to 572.0°F), with a minimum increment of 0.1° (either scale).
IV.3 SET The SET Key The SET key is pressed when the operator wants to view or edit temperature data. The Arrow (direction) Keys IV.4 The ARROW keys are used to increment (or decrement) temperature values. To input temperatures, a single press of either of these keys will result in a single digit increment in the displayed temperature value. When large temperature steps are required, the user will find it simpler to press and hold these keys and scroll through available numbers.
V.2 Setting a Temperature 1) Press the Note: SET key. The Model 75 Controller will display the last set point temperature value upon entering the temperature setpoint screen. If you do not press either of the or keys or the SET key within approximately 4-5 seconds, the Model 75Controller will “beep” and revert to its non setpoint mode (the temperature will again be displaying tenth degree values). Simply press the SET key again to re-enter the temperature setpoint mode.
Note: The last scrolled-to-temperature (the last setpoint temperature) will be retained in non-volatile memory and will become the default setpoint temperature the next time the temperature controller is powered up. 6) Temperature control of the Thermo Container will be maintained for as long as the Model 75 Controller is powered up, or until the RUN STBY key is pressed to stop the control action. VI.
VI.2 Thermosel Overheat Error If the sensor becomes dislodged or is left out of the Thermo Container or if the Thermo Container coils become “open”, and the Model 75 Controller is not sensing a temperature rise while dispensing power to the Thermo Container, it will display the following message after approximately a 3-minute delay: e  The Model 75 Controller will stop control and will stay in this state until the problem is corrected.
Appendix A - Warranty Repair and Service Warranty The Brookfield Model 75 Temperature Controller is guaranteed for one year from date of purchase against defects in materials and workmanship. The Controller must be returned to Brookfield Engineering Laboratories, Inc. or the Brookfield dealer from whom it was purchased for no charge warranty service. Transportation is at the purchaser’s expense. For repair or service in the United States return to: Brookfield Engineering Laboratories, Inc.
