22.040/1
X
s
T
Y
10V
B10592
1
2
3
1
2
3
X
Sd
0V
T
Y10162
Type
Capillary tube
Setting
°C
Switching
K
Permissible
°C
Weight
kg
TFL 611 F200
2 m
1...10
2
–15...110
0.34
TFL 611 F600
6 m
1...10
2
–15...110
0.41
Power supply
24 V~, ± 20%
Active capillary l ength
min. 250 mm
Power consumption
6 VA
Factory setting
5 °C
Measuring range of sensor
0...15 °C / 0…10 V=
Temp. at head of instrument
4)
–15...60 °C
Control signal output
0...10 V=, max. ± 1 mA
Degree of protection
IP 42 (EN 60529)
Max. length of cable at 1,5 mm
300 m
Protection class
II (IEC 60730)
Control signal input
0...10 V=, max. ± 0,1 mA
Contact rating
Wiring diagram
A10390
maximum
6(4) A, 250 V~
Dimension drawing
M10422
minimum
5 mA, 5 V~/=
Fitting instruct i ons
MV 505954
Time constant
in still air
90 s
in moving air
40 s
Accessories
0292146 001*
Set for duct fitt i ng c onsisting of: 5 capillary-tube holders, 1 depth adjustabl e flange
0303167 000*
5 capillary-tube holders
0374534 001*
Depth adjustable flange
*)
Dimension drawing or wiring diagram are available under the same number
1)
The accessory 0292146 001 for duct fitting must be ordered separately.
2)
If under inductive load, take RC circuit into account.
3)
The monitor always reacts to the coldest place (minimum length is 250 mm).
4)
The head of the instrument is frost protected for ambient temperatures up to max. -15 °C by a heating system.
7122040003 06
TFL 611: Continuous frost monitor with capillary sensor
How energy efficiency is improved
Demand-led, large-scale monitoring of installation part s with fully active sensor.
Areas of application
Temperature monitoring in air/water heat exchangers and air ducting with constant frost-protection
control, frost-protection switch and temperature transmission. For applications on the air side of installations.
Features
• Measuring range: 0 to 15 °C
• Frost point can be adjusted
• Contact rating: 5 mA, 5 V to 6 A, 250 V
• Start-up function
• LED display indicating risk of frost
• Selectable block on switching on again
• < 40 s time constant with moving air
• 2 or 6 m copper capillary tube
Technical description
• Two-part plastic housing
• Ambient temperature: –15 to +60 °C
• Controlled housing heating to safeguard measured variable
• IP 42
• Active from 25 cm capillary length in switching temperature
range XS
1)
1)
2
2)
diff. XSd
sensor temp.
3)
Operation
Using a vapour-filled capillary tube and diaphragm system, the frost monitor measures the lowest
temperature that occurs anywhere along at least 250 mm of the capillary tube.
If the monitor is correctly positioned at the air outlet of the heating coil, it measures the lowest temperature even if there are strata of differing air temperatures. In so doing, the steam pressure causes a
movement of the diaphragm capsule in the capillary tube. By means of an inductive measuring system, this movement is converted into an electric signal and is amplified electronically; it then creates a
0...10 V d.c. measuring signal.
Sauter Components
22.040/2 TFL 611
7122040003 06
Key
P (XS)
Frost point, variable
T
Capillary temperature
Y10
Valve control signal (when Y = 0 V d.c.)
Q12 Q14
Q14Q12
Q11
Q11
6 K
10 V
0 V
2 K
P (1...10 °C)
Y10
T [°C]
B10599
The TFL 611 fulfils its task with the aid of three independent functions:-
1. It continuously opens the heating valve within a proportional control range.
2. It switches the ventilators off and closes the dampers via its relay contacts.
3. It makes the measured temperature available for further processing.
The measuring signal is processed further for the monitor function and the valve control to the frost
signal.
At about 6 Kelvin above the set frost point (P), the frost signal starts to rise.
Functional diagram
Start-up function
The frost signal is added to the valve control signal that is fed to signal input Y. This causes the heating valve to be opened via signal output Y10 before the output relay is switched to the 'Frost' position
(Q11-Q12). This circuit prevents the system from switching on and off several times when starting up.
In order to ensure that the temperature measured at the capillary tube is always the lowest one, the
temperature of the diaphragm capsule inside the housing must always be higher than the temperature
of the capillary tube. This is achieved using the controlled heater that is installed in the housing as
standard, which maintains a diaphragm capsule temperature of above 15 °C even at an ambient
temperature of −15°C.
Operating modes
There are three operating modes which can be selected using a rotary switch:Automatic mode (Auto) After a frost shut-off, the output relay automatically returns to its normal
position when the capillary tube temperature increases (> 2 K).
Manual mode (Manu) After a frost shut-off, the output relay does not switch back (when the capil-
lary tube temperature is increasing, i.e. > 2 K) until either the internal reset
button has been pressed or the power supply has been switched off (using
an external reset button if necessary).
Test mode (Test) In test mode, the output relay is forced into the 'Frost' position. The valve
control signal Y10 is not affected. When the equipment switches back to the
'Manu' switch position, the frost position is retained and can be cancelled using the reset button.
Features
The frost monitor consists of a two-piece plastic housing, a lower part and a lid, and a capillary that is
active over its entire length. The lid is attached to the lower part of the housing with a screw. The
housing contains: the electronic circuit, the diaphragm capsule with heater, the adjustment elements,
the type plate and the connecting terminals.
The connecting terminals, the adjustment elements and the name plate are accessible after removing
the lid. The cables can be routed at the bottom of the housing.
The wires can be fed through at the bottom of the housing. For this purposes, the housing has a
break-out aperture without a thread for a M16 screw connection and two break-out inputs for additional M16 screw connections. The frost monitor is designed for direct wall mounting with or without a test
loop, and also for wall mounting with a mounting flange (for air-duct insulation).
Sauter Components
TFL 611 22.040/3
CE conformity as per
Low-Voltage directive 2006/95/EC
EN 60730-1
EMC Directive 2004/108/EC
EN 61000-6-1/ EN 61000-6-2
EN 61000-6-3/ EN 61000-6-4
Key
1
LED indicator (red) denoting risk of frost
2
Potentiometer for setting the frost point
3
Mode switch with three operating m odes: Auto, Manu and Test
4
Reset button for resetting the frost status in normal m ode
7122040003 06
1
2
3
4
5 6
7
8
9
10
°C
Auto
Test
Manu
Reset
1 2 3 4
B10598
Setting elements
Engineering and fitting notes
The monitor requires a power supply of 24 V AC. A transformer for safety extra-low voltage (SELV)
with separate windings and for 100% duty cycle should be used.
Fuses, switches, wiring and earthing should be implemented in accordance with local regulations. The
maximum permissible cable lengths should be observed.
If the capillary becomes mechanically damaged or there is a leak somewhere in the diaphragm system, the frost monitor simulates a low temperature and moves to the 'Frost' position. The same applies in the event of a power failure or when important electronic components malfunction.
Where to fit
On the warm side of the heating coil (air/water heat exchanger).
Fitting the housing
Direct fitting
Fit the housing (with its integrated fixing holes) onto the wall of the heating coil. Protect the capillary
tube in the air-duct hole with the rubber plugs provided.
If fitting inside the duct, fit the housing to the inside wall of the heating coil, feeding the capillary tube
through a housing hole at the side.
Direct fitting, with test loop for operational test
Fit the housing (with its integrated fixing holes) to the wall of the heating coil, feeding the capillary tube
through a housing hole at the side. Form a test loop with the capillary tube and then feed the capillary
tube into the air duct. Protect the capillary tube in the air-duct hole with the rubber plugs provided.
This method of fitting is unsuitable if the ambient temperature at the test loop (which is outside) can
fall below that at the place of measurement in the air duct (the measuring signal of the sensor always
equates to the lowest temperature, wherever it occurs on the capillary tube).
With accessory 0292146 001
Suitable for air ducts with insulation of up to 70 mm.
Fit the flange onto the wall of the heating coil and feed the capillary tube through the flange into the air
duct.
Fitting the capillary tube
Wind the capillary tube in coils, keeping the same distance, around the whole heating coil and fix to
the fins with spacer clamps at a distance of about 50 mm to the fins (accessory 0303167).
Note
The capillary tube should not be bent sharply. Any bends should have as large a radius as possible.
Fitting notes
The connection terminals are protected against being wired up incorrectly with regard to own voltages
of up to 24 V a.c. There is no protection against incorrect connection of 230 V a.c. mains.
Putting into service
The frost monitor should be put into service and set up in accordance with the instructions supplied.
The frost monitor can be tested for correct operation with a test loop using an ice/water mixtur e.
The relay output can be checked using the operating-mode switch (in the 'Test' position).
Additional technical data
Sauter Components
22.040/4 TFL 611
Wiring diagram Dimension drawing
Accessories
7122040003 06
M00157b
0303167
5,4 1
6
R 30
10
40
54
Y G0
LS
N
MM
G
G Y
Q11
Y10 B M Q12 Q14
G Y
G0
N1
F1
P1
Y1
H1 K1
S1
AC 230 V
AC 24 V
L
A10390a
0...
10V
0...
15°C
T
Key
F1
TFL 611 frost monitor
G
System power (SELV) 24 V a. c.
N1
Controller with 0...10 V d.c. control signal
M
System zero, meas uri ng z ero
H1
e.g. external frost t rans mitter
B
Measuring signal output 0…10 V d.c. 0…15 °C
K1
e.g. ventilator protection
Y
Signal input for 0…10 V d.c. controller valve control s i gnal
P1
e.g. temperature indicator with signal input
Y10
Signal output for 0…10 V d.c. valve control
0...10 V d.c. and dis pl ay range of 0...15 °C
S1
If required: button for external
Q11
release of frost positi on
Q12
Closed when risk of frost
Relay contacts 5…250 V a.c./d.c.
Y1
Control element with 0...10 V d.c. control signal input
Q14
136,2
96
0374534 001
0292146 001:
5 pcs. 0303167 000 + 1 pcs. 0374534 001
Printed in Switzerland
Right of amendment reserved
N.B.: A comma between cardinal
numbers denotes a decimal point
© Fr. Sauter AG, CH-4016 Basle
Sauter Components
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