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1/4 DIN RTD Input High Accuracy Bright LED Digital Controllers
1/4 DIN RTD Digital Controllers
Volume discounts available
Volume Discount Schedule
| Quantity | Price each |
|---|---|
| 1-9 | $674.33 |
| 10-24 | $640.61 |
| 25-49 | $606.90 |
| 50-99 | $573.18 |
| 100-499 | $539.46 |
| 500+ | $505.75 |
Please contact Technical Sales Team for assistance. Any remaining stock is available for purchase
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For a possible replacement, please see our list of 1/4 DIN controllers here . Or click the link to see Omega's full listing of PID Controllers
- High Accuracy: to 0.1% of Span
- Single and Dual Setpoint Models
- 1.0° and 0.1° Models
- Adjustable Proportion Band
4201APC1 Model Options
View all modelsEdit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.
*Highlighted options are not compatible. Please select a different combination.
Control Outputs
Additional Feature
Output Type
Measurement Type
Form Factor
Number of Inputs
Input Type
Supply Voltage Type
Display Type
The OMEGA™ 4200A Series is an ideal controller for RTD applications. This quality-built linearized instrument is available in both 1.0° and 0.1° resolution models. Higher accuracies, accuracies 5 to 10 times greater than the typical 1% meter indicating controller, are achieved through a unique linearizing technique. Bright, easy-to-read LED digits present an unambiguous temperature indication. Accuracy is enhanced through 3-wire lead compensation– a feature allowing the sensor to be up to 1000' from the controller. The standard unit includes adjustable proportional band, manual reset, plus a metal 1/4 DIN case with full plug-in construction, allowing front removal of the control unit without disturbing the case and its rear wiring. The series 4200A controllers are available in single or dual setpoint models with relay output as a standard. Triac or 4 to 20 mA optional outputs are offered on the first setpoint at no additional cost. Truly a superior controller at a remarkably low price.
Model 4201A Single Setpoint Proportional Controller This versatile digital controller can be operated as a proportional controller with the adjustable bandwidth up to 3% of full span. The setpoint temperature is always available. Simply push the spring-loaded setpoint switch to the right, and the setpoint is digitally displayed. To change the setpoint, with the switch deflected to the right, adjust the knob to the right of the switch until you get the desired reading. The standard Model 4201 has an internal SPDT relay (7 amp resistive at 120 Vac). This model is also available with optional Triac or 4 to 20 mA output in place of the relay. See Options and Specifications for more information.
Model 4202A Dual Setpoint Controller The first setpoint of the Model 4202A incorporates the same features as the Model 4201A and also can be ordered with the optional Triac or 4 to 20 mA output. The second setpoint may be set at any value within the full span of the controller. It energizes an SPDT internal relay (3 amp resistive 120 Vac) which can be used as either an on-off control, a high-limit alarm, or a low-limit alarm. For an alarm with latching features, an external latching relay and push button to reset are suggested. The second setpoint is set and displayed using the same procedure as for the Model 4201A except the switch is deflected to the left and the left adjustment knob is used.
Model 4201A Single Setpoint Proportional Controller This versatile digital controller can be operated as a proportional controller with the adjustable bandwidth up to 3% of full span. The setpoint temperature is always available. Simply push the spring-loaded setpoint switch to the right, and the setpoint is digitally displayed. To change the setpoint, with the switch deflected to the right, adjust the knob to the right of the switch until you get the desired reading. The standard Model 4201 has an internal SPDT relay (7 amp resistive at 120 Vac). This model is also available with optional Triac or 4 to 20 mA output in place of the relay. See Options and Specifications for more information.
Model 4202A Dual Setpoint Controller The first setpoint of the Model 4202A incorporates the same features as the Model 4201A and also can be ordered with the optional Triac or 4 to 20 mA output. The second setpoint may be set at any value within the full span of the controller. It energizes an SPDT internal relay (3 amp resistive 120 Vac) which can be used as either an on-off control, a high-limit alarm, or a low-limit alarm. For an alarm with latching features, an external latching relay and push button to reset are suggested. The second setpoint is set and displayed using the same procedure as for the Model 4201A except the switch is deflected to the left and the left adjustment knob is used.
| Model No. | Range | Sensor Type | Resolution |
| 4201APF1 | 0 to 999°F | 100 ohm Platinum RTD alpha = 0.00385 ohm/ohms/°C | 1°F |
| 4201APC1 | 0 to 600°C | 1°C | |
| 4202APF1 | 0 to 999°F | 1°F | |
| 4202APC1 | 0 to 600°C | 1°C | |
| 4201APF2 | 199.9 to 199.9°F | 1°F | |
| 4201APC2 | 199.9 to 199.9°C | 1°C | |
| 4202APF2 | 199.9 to 199.9°F | 1°F | |
| 4202APC2 | 199.9 to 199.9°C | 1°C |
