Potter CF-135W 135°F Fixed Temperature Heat Detector

The Potter CF-135W 135°F Fixed Temperature Heat Detector provides dependable thermal detection for compatible conventional fire alarm systems. It responds when its sensing mechanism reaches the specified temperature of 135°F (57°C). In addition, its durable construction and simple mechanical operation make it suitable for many commercial and industrial applications.

Reliable Fixed-Temperature Heat Detection

The Potter CF-135W belongs to the THERMOFLEX CF Series of conventional heat detectors. It uses a fixed-temperature sensing mechanism to recognize excessive heat.

Unlike rate-of-rise detectors, this model activates when its thermal element reaches the specified temperature threshold. Therefore, it provides a practical solution for environments where rapid temperature changes may occur during normal operations.

The detector uses a spring-loaded plunger and a fusible alloy element. When the sensing mechanism reaches its rated temperature, the alloy releases the plunger.

As a result, the plunger closes the alarm contacts and activates the connected fire alarm initiating circuit.

135°F Thermal Activation

This model features a nominal operating temperature of 135°F (57°C). Its fixed-temperature design provides a defined thermal activation point for compatible fire alarm applications.

The detector does not rely on smoke particles or optical sensing technology. Instead, it responds directly to heat.

Consequently, it can provide a suitable detection method in locations where airborne dust, vapors, or other environmental conditions may affect smoke detectors.

Non-Restorable Operation

The fixed-temperature element is non-restorable after activation. Once excessive heat activates the mechanism, the detector requires replacement.

This design helps technicians identify a detector that has experienced an alarm-level temperature event. Therefore, maintenance personnel should never attempt to reuse an activated detector.

Key Features

• Conventional fixed-temperature heat detector
• 135°F (57°C) activation temperature
• THERMOFLEX CF Series design
• Fixed-temperature detection only
• Normally open alarm contacts
• Non-restorable thermal mechanism
• Spring-loaded plunger operation
• Fusible alloy sensing element
• White housing
• Low-profile construction
• Indoor installation
• 40-foot maximum listed spacing
• 100°F maximum installation temperature
• Compatible with conventional initiating circuits
• Potter stock number 1000142
• UL and ULC Listed

Detector Spacing and Coverage

The Potter CF-135W has a maximum listed spacing of approximately 40 feet on an uninterrupted ceiling.

However, actual detector spacing depends on ceiling height, building construction, airflow, and applicable fire alarm requirements.

Therefore, installers should follow the approved system design rather than relying only on the maximum spacing value.

Indoor Fire Alarm Applications

This fixed-temperature heat detector supports a variety of indoor fire alarm installations.

For example, technicians may use it in warehouses, storage rooms, utility areas, mechanical spaces, and industrial facilities.

It can also provide an alternative to smoke detection in suitable environments with airborne particles or temporary vapors.

Nevertheless, installers must evaluate the environmental conditions before selecting a detector.

Mounting and Installation

The detector features a low-profile housing with a diameter of approximately 5.25 inches and a height of approximately 2 inches.

It mounts to a compatible 4-inch octagonal electrical box. In addition, its white finish provides a clean appearance for indoor installations.

The maximum recommended installation temperature is approximately 100°F (38°C).

Electrical Operation

The detector uses normally open contacts to communicate with a compatible conventional fire alarm circuit.

During normal conditions, the contacts remain open. When the thermal mechanism activates, the contacts close and remain in the alarm position.

As a result, the connected fire alarm control panel can recognize the alarm condition.

Installation and Compatibility

Before installation, verify the fire alarm control panel, initiating circuit requirements, detector spacing, and ambient temperature.

Also, confirm that the application requires fixed-temperature detection rather than rate-of-rise operation.

Qualified fire alarm professionals should install and test the detector. Furthermore, technicians should follow Potter installation instructions and applicable fire alarm codes.

Overall, this Potter fixed-temperature heat detector provides straightforward thermal protection for compatible indoor fire alarm systems. Its 135°F activation rating, normally open contacts, durable construction, and non-restorable operation make it a practical choice for professional fire detection applications.

CF-135W Datasheet