TFL 611: Continuous frost monitor with capillary sensor

Product catalog summary

Overview: The TFL 611 is a continuous frost monitor with a capillary sensor designed to improve energy efficiency through demand-controlled, large-area monitoring of system components. It is primarily used in ventilation and air conditioning units to prevent freezing.

Features:

Detects the lowest temperature over a length of at least 250 mm along the capillary tube.
Active capillary sensor measures temperatures from 0 to 15 °C.
Includes a vapour-filled capillary tube and diaphragm system with an inductive measurement system.
Equipped with a start-up function, LED, and 7-segment display.
Self-monitoring of the sensor line.

Technical Data:

Power Supply: 24 V~, 10/-20%, with power consumption < 6.6 VA.
Measuring Range: 0 to 15 °C, with a setting range of 1 to 10 °C.
Accuracy: ± 1 K at the adjustment point of 5 °C.
Switching Difference: Approximately 2 K.
Response Length: Minimum 250 mm for the capillary tube.
Inputs/Outputs: Analogue input for valve control (0 to 10 V), analogue outputs for sensor temperature and valve control, and potential-free relay outputs.

Construction:

Terminals with spring technology, cable inlet with M16 cable gland.
Protection Class: I, with housing made of PA, silver grey.

Standards and Directives:

Vibration Resistance: EN 60721-3-3 (class 3M2).
Type of Protection: IP 42 (EN 60730).
Complies with RoHS Directive 2011/65/EU and EMC directive 2004/108/EC.

Operation: The frost monitor uses a vapour-filled capillary tube and diaphragm system to detect the lowest temperature along the tube. It performs three functions: opening the heating valve, switching off fans, and providing temperature data for further processing.

Operating Modes:

Automatic Mode: Relay switches back to normal when temperature increases.
Manual Mode: Requires manual reset or power interruption to switch back.
Test Mode: Forces relay to switch to "Frost" position for testing.

Installation Notes: The monitor should be installed on the warm side of the heating coil. The capillary tube must be protected and installed without kinks. The device requires a 24 V~ power supply and must adhere to local regulations for wiring and fuses.

Commissioning: Follow enclosed instructions for commissioning. No adjustments are needed for the frost sensor, which is factory set at 5K. Manual and function tests can be performed to ensure proper operation.

Disposal: Dispose of the product according to local laws, with more information available in the Declaration on materials and the environment.

Catalog excerpts

TFL 611: Continuous frost monitor with capillary sensor-1

Product data sheet TFL 611: Continuous frost monitor with capillary sensor How energy efficiency is improved Demand-controlled, large-area monitoring of system components with active capillary sensor Features • Detects the lowest temperature that occurs for a length of at least 250 mm at any position along the capillary tube • Used on air side in ventilation and air conditioning units where protective measures must be taken against freezing • Active capillary sensor for measuring the lowest temperatures in the range 0...15 °C • Vapour-filled capillary tube and diaphragm system with inductive system of measurement • Setting range 1...10 °C • Start-up function • LED and 7-segment display • Self-monitoring of sensor line Technical data Power supply Power consumption Frequency Measuring range Setting range Adjustment point Accuracy for adjustment point Switching difference Temperature for capillary tube Time constant in still air Time constant in moving air Response length for capillary tube Inputs/Outputs Admissible cable length Analogue input Valve control for terminal Y Analogue outputs Sensor temperature for terminal B Valve control for terminal Y10 Ambient conditions Operation Potential-free relay outputs (Q terminals) Humidity (non-condensing) Humidity (non-condensing) Terminals with spring technology Cable inlet Cable gland M16 for cable diameter 5...10 mm SELV/PELV: Safety Extra Low Voltage/Protected Extra Low Voltage No earth conductor necessary Right of amendment reser

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TFL 611: Continuous frost monitor with capillary sensor-2

Product data sheet Housing cover Capillary tube Vibration resistance Overview of types Type Continuous frost monitor; 0...15 °C; capillary tube length= 2m Continuous frost monitor; 0...15 °C; capillary tube length= 6m Accessories Type Set for duct fitting consisting of: 5 capillary-tube holders, 1 depth-adjustable flange Five holders for fitting the capillary tube Depth-adjustable flange Intended use This product is only suitable for the purpose intended by the manufacturer, as described in the “Description of operation” section. All related product regulations must also be adhered to. Changing...

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TFL 611: Continuous frost monitor with capillary sensor-3

Product data sheet Start-up function The frost signal is added to the valve control signal connected to signal input Y. The effect of this is that before the output relay is switched to the “Frost” position (Q11/Q12), the heating valve is opened fully via signal output Y10. This switching prevents the system from turning on and off multiple times when it starts up. To ensure that the lowest temperature is always detected at the capillary tube, the temperature of the diaphragm box in the interior of the housing must always be above the capillary temperature. This is performed by the controlled...

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TFL 611: Continuous frost monitor with capillary sensor-4

Product data sheet the frost monitor falsely detects a low temperature and goes into the “Frost” position. The same applies to a power failure or the failure of important electronic switching components. In the case of larger air duct diameters, the monitoring of a heating coil can be performed with multiple TFL 611 via: • Series connection of the TFL 611 valve control signal outputs/inputs • Series connection of the TFL 611 relay contacts Note If the relay contacts (Q11/Q12/Q14) are being operated with low voltage (U > 50 V), the following conditions apply: • For adjustment work, the device...

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TFL 611: Continuous frost monitor with capillary sensor-5

Product data sheet Disposal When disposing of the product, observe the currently applicable local laws. More information on materials can be found in the Declaration on materials and the environment for this product. Connection diagram System null, measuring null Measuring signal output = 0...10 V ≙ 0...15 °C Signal input for controller valve control signal = 0…10 V Signal output for valve control = 0…10 V Relay contacts ~ 12...250 V Min 100 mA, max 6(2) A Relay contacts = 12...24 V Min 100 mA, max 6A Dimension drawing Right of amendment reserved © 2015 Fr. Sauter AG

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