INSTALLATION
The TxBlock transmitter is intended for in head mounting. Its drawing is presented in
Figure 04.
Figure 04 – TxBlock dimensions
ELECTRICAL CONNECTIONS
Figure 4 and 5 below shows the thermocouple wiring. Terminals 1, 2 and 3 are used
for sensor input. For 2-wire Pt100, terminals 2 and 3 shall be connected together.
The LOAD represents the input shunt of an instrument measuring the 4-20 mA
current loop.
Figure 05 – Transmitter connections – Pt100
Figure 06 – Transmitter connections – Thermocouple
Its is important to follow the recommendations below:
•
Signal wires should be installed in grounded in conduits and away from power or
contactor wires.
•
The instrument should have its own power supply wires, which should not be
shared with electrical motors, coils, contactors, etc.
•
Installing RC filters is strongly recommended at contactor coils or any other
inductors.
•
System failure should always be taken into account when designing a control
panel to avoid irreversible damage to equipment people.
SPECIFICATIONS
Sensor input: User defined. The supported sensors are listed in Table 01, along
with their maximum ranges.
Thermocouples: Types J, K, R, S, T, N and E, according to IEC 60584 (ITS-90).
Impedance >> 1 M
Ω
Pt100:
Excitation: 0.17 mA. 2 or 3-wire connection (for 2-wire
sensors, tie terminals 2 and 3 together).
α
= 0.00385,
according to IEC 60751(ITS-90).
Voltage: 0 to 50 mVdc. Impedance >> 1 M
Ω
Sensor Type
Range
Minimum Measurement Span
Thermocouple K
0 to 1370 °C
100 °C
Thermocouple J
0 to 760 °C
100 °C
Thermocouple R
0 to 1760 °C
400 °C
Thermocouple S
0 to 1760 °C
400 °C
Thermocouple T
0 to 400 °C
100 °C
Thermocouple N
0 to 1300 °C
100 °C
Thermocouple E
0 to 720 °C
100 °C
Pt100
-200 to 650 °C
40 °C
Voltage
0 to 50 mV
5 mV
Table 01 – Transmitter input sensors
Total accuracy: better than 0,3 % of the maximum range for thermocouples and 0,2
% for Pt100 and voltage;
Response time: < 100 ms
Output: 2-wire 4-20 mA, linear with respected to the measured temperature.
Resolution: 0,004 mA (12 bits).
Power supply: 12 to 35 Vdc, across the transmitter;
Maximum load (RL): RL (max.) = (Vdc – 12) / 0,02
[
Ω
]
Were: Vdc= Power supply voltage
Operating temperature: -40 to 85 °C
Humidity: 0 to 90 % RH
Electromagnetic compatibility: EN 50081-2, EN 50082-2
No isolation between the sensor and the 4-20 mA loop.
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Housing: ABS UL94-HB.
Dimensions: 44 mm (diameter) x 25 mm (height).
M I C R O P R O C E S S O R
B A S E D T E M P E R A T U R E T R A N S M I T T E R
T x B l o c k
I N S T A L L A T I O N A N D O P E R A T I N G M A N U A L
Man 5001473
