User manual | Temperature Monitors 7 99

O
Temperature Monitors
C
Temperature Monitor for Thermal Resistance Pt 100
Temperature Setting Range 0 to + 799 °C
Adjustable Hyteresis
Digital Setting of the Limit Values
Monitoring Rupture and Short Circuit of the Sensor Cables
Compensation of the Sensor Linearity Error
Open and Closed-Circuit Principle
STW 1101
A1
15
T+
For Example
STW 1102
T
Monitoring of etching solutions
Temperature monitoring of backing lines
Monitoring of chemical processes
Monitoring of intake air and off-air temperature in
air conditioning systems
Over temperature protection
Under temperature protection
T–
MAX. +799 °C
TRIPPED
HYST.
Hysteresis
Setting of temperature-limit value
7 9 9
%
SUPPLY
The threshold temperature preset digitally is compared with the temperature
measured value. If the temperature measured value is higher than the limit
value, and provided that there is no rupture or short circuit in the sensing
element, the temperature monitor switches.
The > LED lights up.
If the temperature measured value falls below the adjusted hysteresis, the
STW switches back to its initial state.
Supply voltage, over temperature and rupture or short circuit of the sensing
element are displayed by the SUPPLY and TRIPPED LEDs respectively.
>ϑ
SCHLEICHER
16
A2
18
Properties of the measuring sensors
4
STW 1101: Open-circuit principle
STW 1102: Closed-circuit principle
Measurement range
NiCr-Ni
very large
Pt 100
average to large
Setting time
short
longer
Setting Range
Accuracy
Dimensions
average
micro to small
precise
small
Temperature: 0 to + 799 °C digital
Hysteresis: 0,2 to ≥ 10 % analog
Application
For measurements of
large meas. ranges
with average need
of accuracy
For measurements of
average up to large
meas. ranges with
high accuracy
very good
good
good to very good
average
cheaper sensor
Price is higher than
for thermocouple
sensors
Performance for measurement in fluids
Performance of meaisurement of gases
(e.g. air temperature)
Costs (for similar
mechanical design
Principle Diagram
STW 1101, STW 1102
Pt 100, 3-Wire Connection
A1 15 T+ T T–
A1
16 18
RLM
ϑ
Pt 100
RL2
IK
16 18
A2
3-Wire Connection
Three types of connections are normally used for Pt 100.
The temperature monitors STW 1101 and STW 1102 are connected
according to the three wire technology (principle diagram). Doing so, the
constant current IK flows through the temperature sensor.
In order to halve the measurement errors through the line resistances RL1
and RL2 ,a third conductor is used as measuring conductor.
The resistance of the measuring conductor RLM can be disregarded
because of the high internal resistance of the temperature monitor.
T+
T
1
A2
15
IK
1
RL1
Pt 100 Temperature Sensor
Pt 100 Sensor acc. DIN 43 760, DIN IEC 751
Connection Diagram
Pt 100
4
Further technical information can be provided by the
sensor supplier.
KS 0304/1
4.2
Function
T–
RL1/RL2 = Line resistance
= Resistance of
RLM
the measuring line
= Constant current
IK
Relays and Automation Systems
4.x
O
Temperature Monitors
STW 1101
Application Example
A 1042
C
STW 1102
Function Diagram
FD 0113 W1
STW 1101
Air Conditioning System
Supply voltage
L1
A1 15 T+ T T –
STW
A1
15 1102
A2
16 18
LED SUPPLY
Cable rupture
Response value Meas. value
Release value
Short circuit
LED TRIPPED
Meas. sensor
Pt 100
LED > ϑ
15/18
15/16
Adjustable hysteresis = response value – release value
16 18
Function Diagram
A2
Fault
indicator
N
FD 0114 W1
STW 1102
Supply voltage
LED SUPPLY
Cable rupture
Response value Meas. value
Release value
Short circuit
LED TRIPPED
The intake air temperature of the air conditioning system is monitored
with the Pt 100 sensor.If the temperature rises above the set limit value,
the STW1102 switches. A fault signal is given through the terminal
15/18.
LED > ϑ
Application Example
15/18
15/16
A 1043
Adjustable hysteresis = response value – release value
Monitoring of Chemical Processes
Dimension Diagram
S 3 -18
for DIN-Rail acc. to EN 50022
A1 15 T+ T T –
STW
A1
15 1102
A2
Fault
indicator
Meas.sensor
Pt 100
105,5
16 18
M
A2
O
O
PLC
I
4,5
16 18
4
60
62,5
75
4
L1
35
37,5
45
5
109,5
Accessory
Cover Z 29
45
I
21
47,5
N
The Pt 100 temperature sensor monitors the temperature of the fluid.
If the temperature rises above the set limit value, the PLC is triggered
through the terminal 15/16 and the valve is closed.
7
8,5
∅ 1,5 for Sealing
17
Notes
The items are available in the following designs when large quantities
are ordered:
• Underflow of the temperature
• Hysteresis 0 to 30 K analog adjustable
• Fault memory
• Pt 100 in 4-wire technology
• Pt 100 in 2-wire technology
• For Zener barrier (applications in explosives ambients)
4.x
Order Example
STW 1101 220 to 240 V AC
Type
Rated Voltage
Relays and Automation Systems
4.3
O
Temperature Monitors
TECHNICAL DATA
STW 1101
STW 1102
FUNCTION According to DIN VDE 0435 Sec. 303:09.84
Monitoring of the temperature limit
value for Pt 100/.../3 acc. to
DIN IEC 571.
Linearity error is compensated
Adjustable limit value and hysteresis
Monitoring of sensor line for rupture
and short circuit. Open Circuit
Principle, Temperature transgression
1 LED green, 2 LEDs red
FD 0113 W1
Monitoring of the temperature limit
value for Pt 100/.../3 acc. to
DIN IEC 571.
Linearity error is compensated
Adjustable limit value and hysteresis
Monitoring of sensor line for rupture
and short circuit. Closed Circuit
Principle, Temperature transgression
1 LED green, 2 LEDs red
FD 0114 W1
Function Display
Function Diagram
POWER SUPPLY
Rated Voltage UN
Rated Consumption at 50 Hz and UN (AC)
Rated Consumption at 50 Hz and UN (AC)
Rated Frequency
Operating Voltage Range
MEASURING CIRCUIT
Electrically Isolated
Maximum Setting Value
Switching Hysteresis
Hysteresis Setting referred
to Maximum Setting Value
Average Value Of The Error
Dispersion
Influence Of The Supply Voltage
Influence Of The Ambient Temperature
4
V AC
VA
W
Hz
24
110
- 127
3,3
3,3
2,5
2,5
50 to 60
0,8 to 1,1 x UN
220
- 240
3,3
2,5
24
110
- 127
3,3
3,3
2,5
2,5
50 to 60
0,8 to 1,1 x UN
220
- 240
3,3
2,5
°C
K
yes
0 to + 799, digital
ca. 0,5
yes
0 to + 799, digital
ca. 0,5
%
%
%
%/% ∆Un
% /K∆T
0,2 to≥ 10, analog
± 1,5 ± 1 digit
±1
≤ ± 0,02
≤ ± 0,01
0,2 to ≥ 10, analog
± 1,5 ± 1 digit
±1
≤ ± 0,02
≤ ± 0,01
Short-Circuit Protection, Max. Fuse Element Class gG
A
Permissible Switching Frequency
Switching Cycle/h
Mechanical Lifetime
Switching Cycles
ms
Response Time tA
ms
Release Timet tR
1 Changeover
Ag -- Alloy; Gold -- Plated
230/230
≤5
AC--15: Ue 230 V AC, Ie 3 A
DC--13: Ue 24 V DC, Ie 2 A
6
6000
30 x 106
50
50
1 Changeover
Ag -- Alloy; Gold -- Plated
230/230
≤5
AC--15: Ue 230 V AC, Ie 3 A
DC--13: Ue 24 V DC, Ie 2 A
6
6000
30 x 106
50
50
GENERAL DATA
Creepage and Clearance Distances Between Circuits
According to DIN VDE 0110 - 1:04.97: Rated Withstand Voltage
kV
Over-Voltage Category
Contamination Level
Design Voltage
V
kV
Test Voltage Ueff 50 Hz acc. to DIN VDE 0110 - 1, Table A.1
Protection Class Housing/Terminals acc. to DIN VDE 0470 Sec. 1:11.92
Radiated Noise
Noise Immunity
4
III
3 Outside,2 Inside
250
2,2
IP 30/IP 20
EN 50081--1:03.93, --2:03.94
EN 50082--2:1995
4
III
3 Outside,2 Inside
250
2,2
IP 30/IP 20
EN 50081--1:03.93, --2:03.94
EN 50082--2:1995
- 20 to + 60
S 3 - 18
KS 0304/1
0,29
Cover Z 29
-- 20 to + 60
S 3 - 18
KS 0304/1
0,29
Cover Z 29
Page i.11
Page i.11
OUTPUT CIRCUIT
Contact Equipment
Contact Material
Switching Voltage Un
Maximum Rated Current In per Contact
Application Category acc. to EN 60947--5--1:1991
Ambient Temperature, Working Range
Dimension Diagram
Connection Diagram
Weight
Accessory
GENERAL TECHNICAL SPECIFICATIONS
4.4
C
V AC/DC
A
°C
kg
Relays and Automation Systems
4
4.1

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