Products
Electronic PID Controllers

TR890-Series Electronic PID Controller

A controller is a comparative device that receives an input signal from a measured process variable, compares this value with that of a predetermined control point value (set point), and determines the appropriate amount of output signal required by the final contro element to provide corrective action within a control loop. (T-length) is the measurement between the instrument connection and process connection of the thermowell.

Principle of Operation (Electronic PID Controller)

An electronic sensor (thermocouple, RTD or transmitter) installed at the measurement location continuously sends an input signal to the controller. At set intervals, the controller compares this signal to a predefined set point. If the input signal deviates from the set point, the controller sends a corrective electric output signal to the control element. This electric signal must be converted to a pneumatic signal when used with an air operated valve, such as a Watson McDaniel HB Series Control Valve. The conversion can be made using a Watson McDaniel TA901 I/P Transducer, which converts a 4 to 20 mA electric signal to a 3 to 15 PSI air signal. As an option, a Valve Positioner such as the Watson McDaniel CA2000 may be used to send an air signal to the Control Valve. These Positioners can be controlled with a 3-15 psi air signal from a Pneumatic Controller or a 4-20 mA signal from a PID Controller.

Features (Electronic PID Controller)

Watson McDaniel Electronic Controllers have full auto-tuning and PID capabilities, and offer a host of available options, including user selectable inputs, outputs and ranges.

PID Control is a feature of Watson McDaniel TR890 Electronic Controllers. PID combines the proportional, integral and derivative functions into a single unit.

  • Proportional (P) — Proportional control reacts to the size of the deviation from set point when sending a corrective signal. The size of the corrective signal can be adjusted in relation to the size of the error by changing the width of the proportional band. A narrow proportional band will cause a large corrective action in relation to a given amount of error, while a wider proportional band will a cause smaller corrective action in relation to the same amount of error.

  • Integral (I) — Integral control reacts to the length of time that the deviation from set point exists when sending a corrective signal. The longer the error exists, the greater the corrective signal.

  • Derivative (D) — Derivative control reacts to the speed in which the deviation is changing. The corrective signal will be proportional to the rate of change within the process.

Auto-Tuning will automatically select the optimum values for P, I and D, thus eliminating the need for the user to calculate and program these values at system startup. This feature can be overridden when so desired. On some models, the control element can be manually operated.

How To Order a TR890-Series

1) Model (Case Size)

The Case Size selection is determined by both available and controller features.

2) Input

The Control Input is the signal received by the controller from the sensor. One of three input types can be specified for the controller:

  • [8] Universal: For sensing temperature using a thermocouple, RTD or other device with mV output
  • [4] mA: For controlling pressure or other process conditions with a 4-20 mA output
  • [6] VDC: For controlling pressure or other process conditions with a 0-10 VDC output

A thermocouple for sensing temperature will require a Universal type input (8). Please check your sensor output to select correct type of input of the controller.

3) Control Output

The control output is the corrective signal transmitted from the controller to the control device. Four control out types can be specified for the controller:

  • [I]: 4-20mA control signal
  • [Y]: On/Off contact for controlling relays
  • [P]: SSR drive voltage for controlling Solid State Relays
  • [V]: 0-10 VDC control signal

A thermocouple for sensing temperature will require a Universal type input (8). Please check your sensor output to select correct type of input of the controller.

4) Power Supply

The power supply requirement for the electronic controller must be specified. The available choices are: 100-240 VAC, 50/60 Hz or 24 V AC/DC, 50/60Hz.

5) Event Output (Option)

The Event Output is used to signal an external device when an alarm condition is detected. Various alarm types can be detected by the controller. These include deviation of the measured value from the set value, the measured value exceeding absolute limits (i.e., high and low level alarm) and heater break/loop alarm (i.e., heater current outside of normal limits). If selected as an option, the controller will have two Event Outputs. In the case of a high/low alarm, one output is used for the high level alarm and the other for the low level alarm.

6) Options: Analog Output & Digital Input

The Analog Output is an optional secondary signal that transmits either the measured process value (PV), the target set value (SV) or the Control Output value from the controller to a remote data acquisition device, such as a recorder, personal computer or display unit. One of the following three analog output types can be specified for the controller: 0-10 mV DC, 4-20 mA DC or 0-10 V DC. The analog output type is independent of the measured input type or the control output type. However, the analog output type selection must be compatible with the data acquisition device input.

The Digital Input is an optional input that can be specified for the controller. The digital input functions as an On/Off switch and can be programmed to activate the Set Value Bias or Standby mode, or switch the Control Action type (i.e., to Reverse Acting or Direct Acting).

Note: The Analog Output and Digital Input combination is not available for Model TR891. Only one of these options can be selected for this model.

TR890 Series Electronic PID Controller is designed for use on applications where large load changes are expected, or extreme accuracy and fast response times are needed.

ModelDescriptionsInputControl OutputPower SupplyEvent OutputOptions
TR891-8-A-90-0-0048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACNoneNone
TR891-8-A-90-0-3048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACNoneAnalog Output (0-10 mVDC)
TR891-8-A-90-0-4048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACNoneAnalog Output (4-20 mA)
TR891-8-A-90-0-6048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACNoneAnalog Output (0-10 VDC)
TR891-8-A-90-0-0848mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACNoneDigital Input (switch)
TR891-8-A-90-1-0048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACDual Event (high and/or low alarm)None
TR891-8-A-90-1-3048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-A-90-1-4048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-A-90-1-6048mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-A-90-1-0848mm x 48mm (1/16 DIN)Universal4 - 20 mA100 - 240 VACDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-A-08-0-0048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCNoneNone
TR891-8-A-08-0-3048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCNoneAnalog Output (0-10 mVDC)
TR891-8-A-08-0-4048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCNoneAnalog Output (4-20 mA)
TR891-8-A-08-0-6048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCNoneAnalog Output (0-10 VDC)
TR891-8-A-08-0-0848mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCNoneDigital Input (switch)
TR891-8-A-08-1-0048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCDual Event (high and/or low alarm)None
TR891-8-A-08-1-3048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-A-08-1-4048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-A-08-1-6048mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-A-08-1-0848mm x 48mm (1/16 DIN)Universal4 - 20 mA24 VAC/VDCDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-C-90-0-0048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACNoneNone
TR891-8-C-90-0-3048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACNoneAnalog Output (0-10 mVDC)
TR891-8-C-90-0-4048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACNoneAnalog Output (4-20 mA)
TR891-8-C-90-0-6048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACNoneAnalog Output (0-10 VDC)
TR891-8-C-90-0-0848mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACNoneDigital Input (switch)
TR891-8-C-90-1-0048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACDual Event (high and/or low alarm)None
TR891-8-C-90-1-3048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-C-90-1-4048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-C-90-1-6048mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-C-90-1-0848mm x 48mm (1/16 DIN)UniversalOn/Off Contact100 - 240 VACDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-C-08-0-0048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCNoneNone
TR891-8-C-08-0-3048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCNoneAnalog Output (0-10 mVDC)
TR891-8-C-08-0-4048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCNoneAnalog Output (4-20 mA)
TR891-8-C-08-0-6048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCNoneAnalog Output (0-10 VDC)
TR891-8-C-08-0-0848mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCNoneDigital Input (switch)
TR891-8-C-08-1-0048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCDual Event (high and/or low alarm)None
TR891-8-C-08-1-3048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-C-08-1-4048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-C-08-1-6048mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-C-08-1-0848mm x 48mm (1/16 DIN)UniversalOn/Off Contact24 VAC/VDCDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-D-90-0-0048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACNoneNone
TR891-8-D-90-0-3048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACNoneAnalog Output (0-10 mVDC)
TR891-8-D-90-0-4048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACNoneAnalog Output (4-20 mA)
TR891-8-D-90-0-6048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACNoneAnalog Output (0-10 VDC)
TR891-8-D-90-0-0848mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACNoneDigital Input (switch)
TR891-8-D-90-1-0048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACDual Event (high and/or low alarm)None
TR891-8-D-90-1-3048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-D-90-1-4048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-D-90-1-6048mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-D-90-1-0848mm x 48mm (1/16 DIN)UniversalSSR Driver100 - 240 VACDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-D-08-0-0048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCNoneNone
TR891-8-D-08-0-3048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCNoneAnalog Output (0-10 mVDC)
TR891-8-D-08-0-4048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCNoneAnalog Output (4-20 mA)
TR891-8-D-08-0-6048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCNoneAnalog Output (0-10 VDC)
TR891-8-D-08-0-0848mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCNoneDigital Input (switch)
TR891-8-D-08-1-0048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCDual Event (high and/or low alarm)None
TR891-8-D-08-1-3048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-D-08-1-4048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-D-08-1-6048mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-D-08-1-0848mm x 48mm (1/16 DIN)UniversalSSR Driver24 VAC/VDCDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-E-90-0-0048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACNoneNone
TR891-8-E-90-0-3048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACNoneAnalog Output (0-10 mVDC)
TR891-8-E-90-0-4048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACNoneAnalog Output (4-20 mA)
TR891-8-E-90-0-6048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACNoneAnalog Output (0-10 VDC)
TR891-8-E-90-0-0848mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACNoneDigital Input (switch)
TR891-8-E-90-1-0048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACDual Event (high and/or low alarm)None
TR891-8-E-90-1-3048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-E-90-1-4048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-E-90-1-6048mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-E-90-1-0848mm x 48mm (1/16 DIN)Universal0 - 10 VDC100 - 240 VACDual Event (high and/or low alarm)Digital Input (switch)
TR891-8-E-08-0-0048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCNoneNone
TR891-8-E-08-0-3048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCNoneAnalog Output (0-10 mVDC)
TR891-8-E-08-0-4048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCNoneAnalog Output (4-20 mA)
TR891-8-E-08-0-6048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCNoneAnalog Output (0-10 VDC)
TR891-8-E-08-0-0848mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCNoneDigital Input (switch)
TR891-8-E-08-1-0048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCDual Event (high and/or low alarm)None
TR891-8-E-08-1-3048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 mVDC)
TR891-8-E-08-1-4048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCDual Event (high and/or low alarm)Analog Output (4-20 mA)
TR891-8-E-08-1-6048mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCDual Event (high and/or low alarm)Analog Output (0-10 VDC)
TR891-8-E-08-1-0848mm x 48mm (1/16 DIN)Universal0 - 10 VDC24 VAC/VDCDual Event (high and/or low alarm)Digital Input (switch)
Product Overview
The TR890 Series Electronic PID Controller is designed for use on applications where large load changes are expected, or extreme accuracy and fast response times are needed. With full auto-tune capabilities and a large selection of available inputs, the TR890 Series is ideally suited for use with a Watson McDaniel Control Valve.

Use of a Watson McDaniel No. TA987 Air Filter/Regulator is recommended for filtering and regulating the pressure of plant compressed air, and for delivering clean, dry air at the proper pressure to pneumatic control devices.
Dimensions and Weights