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PROCESS TRANSMITTER WITH RS
485 INTERFACE (MODEL PTX-3000)
Product Description:
Libratherm offers micro-controller
based Process Transmitter model PTX-3000 for
measuring and transmitting the analogue and
digital values proportional to the Process Input.
This model can accept universal input, which
is user selectable using internal DIP switch.
Three options are available, where user can
specify the desired model for universal input
or any of the two fixed input or any of the
single fixed input. The isolated current output
of 4-20mA proportional and linearized (for very
accurate indication) to the process input is
available for remote measurement and indication.
For the dual input model PTX-3000/T, two independent
4-20mA are available.
Download Catalog : PROCESS TRANSMITTER
WITH RS 485 INTERFACE (MODEL PTX-3000) :
ZERO CROSS OVER TURN ON - SCR FIRING CARD
Product Description:
Libratherm offers four
channel SCR firing cards model SCRF-4 for electrical
Heating control using resistive or inductive
loads. Normally the solid state relays are built
around triacs and which are available up to
the current carrying capacity of maximum 50
to 100Amp @ 230VAC, due to limitations of high
PIV as compared to SCRs. Normally, for controlling
the higher ratings of load, power contactors
are used and solid state switching is not easily
accomplished. The card SCRF-4, featured here
can be used to fire up to 500Amps SCRs. Hence,
it is possible to built solid state relay of
as high as 500Ampere @ 230VAC or 415 VAC. The
input control signal coming from the temperature
controller in the range of 3 to 32VDC can be
fed to this card to generate ZERO cross over
Gate to Cathode pulses G1K1+G2K2 to turn ON
the SCR, and the same can be turned off when
the input signal is 0VDC. ZERO cross over circuit
prevents generation of harmonics while turning
the SCR OFF to ON or vice versa.
Download Catalog : ZERO CROSS
OVER TURN ON - SCR FIRING CARD :
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