Watlow Series 146 Temperature Regulator

Watlow Series 146 Temperature Regulator

Product basic information

Core positioning: A DIN rail mounted temperature regulation controller that supports thermocouple or RTD sensor input, with both DIN rail quick installation and embedded installation methods. Designed for various safety application scenarios, it can achieve high/low limit temperature control and is suitable for industrial heating equipment, commercial cooking equipment and other scenarios that require temperature safety protection, such as ovens, reactors, heaters, etc.

Core Features and Advantages

Flexible and convenient installation: Supports DIN EN50022 standard 35mm × 7.5mm rail installation, which can be completed with simple manual tools. Embedded installation can also be selected to adapt to different installation environment requirements.

Diverse control modes: The factory can preset high/low limit control modes, support manual or automatic reset after power failure, and meet different safety control logics; Equipped with temperature over limit latch alarm function, requiring manual reset to enhance safety and reliability.

Intuitive and easy to understand operation: equipped with output status LED indicator lights, providing real-time feedback on working status; Support built-in/remote adjustable or fixed setpoints, calibrated dial to compensate for sensor nonlinearity errors; Simultaneously compatible with both Celsius (° C) and Fahrenheit (° F) temperature scales, suitable for different usage habits.

Comprehensive safety protection: equipped with thermocouple and RTD disconnection protection function, automatically cutting off output in case of sensor failure to avoid equipment damage; Obtained multiple certifications such as CE and FM Class 3545, compliant with EN61010 safety standards, EN61326 industrial electromagnetic compatibility standards (Class B emission), installation category II, pollution level 2, suitable for specific scenarios such as commercial cooking.

Strong adaptability: Supports multiple thermocouple (E, J, K, T type, etc.) and RTD (100 Ω, 1000 Ω) inputs, with optional power supply voltages of 24VAC, 120VAC, 230-240VAC to meet different on-site power supply and sensing needs.

Product Technical Specifications

（1） Control and operation specifications

Control mode: The factory can choose high limit or low limit control; The power-off reset mode can be selected manually or automatically; When the temperature exceeds the limit (too high/too low), a latch alarm is triggered and manual reset is required; Support built-in reset switch or external reset switch provided by the user.

Operation interface: LED indicator light displays output status (power on/off); Adjustable set point (built-in/remote) equipped with calibration dial to compensate for sensor nonlinearity; Fixed set point factory calibration according to user specified values; Dual temperature scale (° C/° F) switching.

（2） Enter specifications

Sensor type: Supports thermocouples (E, J, K, T, etc.) or platinum resistance RTDs, thermocouples have automatic cold junction compensation function, and can choose isolation or grounding type; RTD supports 2-wire or 3-wire system, calibrated at 100 Ω @ 0 ° C, and conforms to the 0.003850 Ω/Ω·° C curve.

Input protection: thermocouple and RTD disconnection protection function, automatically cuts off the output when the sensor is disconnected, preventing equipment from losing control.

Measurement range: Depending on the sensor type and model configuration, for example, E-type thermocouple 0-799 ° C (32-1470 ° F), J-type thermocouple 0-315 ° C (32-600 ° F), T-type thermocouple -200-350 ° C (-328-662 ° F); RTD measurement range -73-600 ° C (-100-1112 ° F), etc., fixed set points can be customized according to user needs (such as 200 ° C, 350 ° C, etc.).

（3） Output specifications

Output type: 8A electromagnetic relay, Form C (single pole double throw, SPDT), rated load: 8A@240VAC (obstructive) 8A@28VDC (Resistive), with a rated load of 275VA, can directly drive small heating equipment, contactor coils, and other loads.

Load protection: When switching inductive loads (such as relay coils, solenoid valves, etc.), an RC suppressor (Watlow recommended model Quencharc, part number 0804-0147-0000) needs to be installed to avoid electromagnetic interference damaging the controller.

（4） Accuracy and stability

Calibration accuracy: The adjustable set point (built-in/remote) is within ± 1% of the range at an ambient temperature of 25 ° C ± 3 ° C (77 ° F ± 5 ° F) and a rated line voltage of ± 1%, with a minimum range of 540 ° C (1000 ° F); The fixed set point has an error of ± 6 ° C/± 10 ° F under the same environmental and voltage conditions.

Setpoint accuracy: The precision of the adjustable set point dial is ± 3%.

Temperature stability: When the thermocouple is input, for every 1 ° C change in ambient temperature, the input reference drift typical value is 9 µ V/° C (5 µ V/° F); When inputting RTD, for every 1 ° C change in ambient temperature, the typical drift value is 0.2 ° C/° C (0.2 ° F/° F).

Voltage stability: For every 1% change in rated line voltage, the range drift is ± 0.01% (minimum range 540 ° C or 1000 ° F).