4848 Reactor Controller Specifications
A total of seven different modules are offered for the 4848 Controller. A maximum of three expansion modules in addition to the primary temperature control can be installed in the 4848 Controller. The user can select either the Tachometer Display Module or the Motor Control Module. This either/ or option also applies to the High Temperature Cut Off and External Temperature Limit Modules.
1. Primary Temperature Control Module (PTM)
The temperature control module can accept either thermocouples or RTD temperature sensors. It has three outputs that are used for heating and cooling control and for alarm actuated heater cut off. The control function is a full proportional, integral and derivative (PID) control with auto-tune capabilities.
The controller provides ramp and soak programming with up to 49 segments.
2. Pressure Display Module (PDM)
The pressure monitoring module is set up to accept its input from a pressure transducer mounted on the reactor or attached accessory. It can be set to accept a wide variety of operating ranges. Operating pressures are transmitted continuously to the PC. These modules are available calibrated in either psi or bar. The output from the pressure monitoring module is connected to the alarm relay to shut off power to the heater if the high pressure limit set by the operator is reached during operation.
3. Tachometer Display Module (TDM)
In this configuration, the module will display the stirrer speed and will continuously transmit it to the PC for display and logging. The stirrer speed is set manually using a potentiometer on the face of the 4848 Controller.
4. Motor Control Module (MCM)
In this configuration, the module provides true closed loop feedback control of the reactor stirring speed. The primary output of this module is wired to dynamically adjust the motor voltage in response to changes in motor loading. This provides better reactor stirring speed regulation than the standard open loop speed control, especially with reactions that involve changing viscosities. Additionally, the use of this module allows the stirring speed set point to be adjusted remotely from the host PC. A byproduct of this closed loop speed control scheme is that the value of the primary controller output directly reflects the degree of loading on the motor in order to maintain a constant stirring speed. While not a direct torque measurement, this is a useful option for those who want to, for example, monitor the progress of polymerization reactions in which there is a change in viscosity as the reaction proceeds. The output to the motor can be displayed and logged on the PC when used with the A3504HC SpecView Software.
5. Motor Torque Module (MTM)
The MTM will display motor output from an MCM. It is particularly useful for applications with changing viscosities.
6. High Temperature Cut Off Module (HTM)
The high temperature cut off module or limit controller augments the operation of the main control module. Its redundant sensor can be mounted either internally or externally to the reactor. The primary output of the module is wired to activate the lockout relay in order to provide safety shutdown should the reactor reach an unsafe temperature.
7. External Temperature Limit Module (ETLM)
This configuration uses the same aforementioned HTM Module with its sensor mounted in such a way to monitor the reactor’s outside wall temperature. The primary output of this module is used to limit the external temperature of the reactor. This is done by interrupting the control signal from the main temperature controller when the external temperature exceeds a predetermined value. The secondary output of this module is used to activate the lockout relay in a non-latching manner if the outside wall temperature exceeds a preset unsafe temperature. The use of this module provides an effective alternative to cascade control, offering improved temperature regulation in systems with large thermal lags, such as those found in non-stirred reactors or systems that use PTFE liners, as well as systems where the reactants have low heat capacities, such as gas phase reactions.
8. Solenoid Valve Module (SVM)
This package includes a solenoid valve and a flow adjustment valve with all of the parts required to assemble an automatic system to control the flow of coolant through a cooling coil in any reactor. It plugs into the cooling output socket on the 4848. It is designed for use with tap water as the cooling media.
Free ParrCom software included with the 4848
(A1925E4 RS-485 to USB Conversion cable required for operation)
Free software is included with each 4848 Controller for simple logging processes (A1925E4 RS-485 to USB conversion cable required). For users requiring a true human-machine interface with the ability to change settings and log multiple variables, the A3504HC SpecView package is recommended.
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