Product Details:

FOXBORO 135KTG-LL is a high-performance panel mount pneumatic indicating controller from the 135 series, a premium industrial instrumentation built for single-loop closed-loop field control. This pneumatic controller is constructed with precision force-balance mechanical pneumatic components and enclosed inside a robust metal housing, shielding the internal precision parts from vibration, dust, moisture and mild corrosive gas in heavy industrial operating environments. The LL suffix stands for low-limit function, adding independent low setpoint protection to prevent process variables from dropping below safe thresholds, which brings extra safety protection for critical production loops. The front panel is equipped with a large clear analog dial, displaying real-time process variable and setpoint simultaneously, so field operators can monitor operating status and adjust control parameters directly on the unit conveniently.

This FOXBORO 135KTG-LL pneumatic controller accepts standard 3~15 psi pneumatic measurement signal from field transmitters that monitor temperature, pressure, flow or liquid level. It processes signals through built-in PID algorithm and outputs 3~15 psi pneumatic signal to drive pneumatic valve actuators, forming a complete closed-loop control circuit. It is equipped with bumpless auto-manual transfer function. Operators can freely switch between automatic control mode and manual output adjustment mode without sudden signal jump, which prevents disturbance and protects continuous production stability. It supports local setpoint adjustment and can also accept remote pneumatic setpoint input to match different system configuration demands. The integrated low-limit feature will trigger protective action automatically when process value reaches the preset low limit, avoiding unsafe operating conditions.

Specifications:

Model: 135KTG-LL

Brand: FOXBORO

Product Type: Pneumatic indicating controller with low limit function

Supply instrument air pressure: 20 ~ 22 psi

Input signal range: 3 ~ 15 psi

Output signal range: 3 ~ 15 psi

Control algorithm: P, PI, PID adjustable

Proportional band: 5% to 500%

Reset time: 0.01 to 50 minutes per repeat

Derivative time: 0.01 to 50 minutes

Control accuracy: ±0.5% full scale

Repeatability: ±0.2% of span

Ambient working temperature: -20℃ ~ +65℃

Relative humidity: 5% ~ 95%, non-condensing

Air consumption: 0.3 scfm under automatic operation

Installation method: Panel mounting

Housing: Heavy-duty corrosion resistant metal shell

Special function: Low limit protection

Without electronic circuit boards, this pneumatic controller has strong electromagnetic interference resistance. It is a reliable selection for explosion hazardous locations where electronic instruments cannot operate safely. The internal modular mechanical structure supports simple routine inspection, disassembly and component replacement, effectively cutting maintenance workload and plant downtime. This process regulator is widely used in oil & gas, chemical refining, power generation, pulp and paper industries. It can be deployed for new automation project construction, and also acts as spare parts to replace aging pneumatic control equipment on site. Every FOXBORO 135KTG-LL pneumatic controller is fully calibrated before delivery to maintain consistent and stable long-term performance for process automation.