Libratherm offers micro-controller based (T + Rh + DP) Indicator cum Transmitters with 1” high digital display for long distance visibility and 4-20mA retransmission outputs for T, Rh and DP each. RS 485 or Ethernet interface is also made available for digital interface to PLC. These instruments are specially designed for cleanroom monitoring.
Respective sensors for T, RH and DP are built-in to the same enclosure or alternately provision for the external sensor is available.
The indicator is housed in an ABS – IP65 enclosure and top fascia is covered with stainless steel (SS304) metal plate. The indicator can be mounted in flush with the wall, all the sensing and cabling is done from the rear side of the enclosure. Externally connected sensors can be installed at suitable locations as per the requirement.
|Application||Real time data display|
External / Internal Capacitive / Pt-100 based T + Rh sensor and built in
-40.0 to 60.0oC /-40.0 to 140.0oF
+/- 0.3 ⁰C/oF
0.0 to 100.0 %RH
+/-1.0 %RH @ 25.0 ⁰C
Diff. Pressure Range
+/-100 mmWC or +/-999 Pascal
(UOM can be selected)
DP connection using 6 mm self- lockable PU tube connector at the back.
+/- 1% of the calibrated range.
4 digits LED display each for T, %RH and DP – 1” red /green/blue
24VDC @ 300mA (+/-10%) or 230VAC (Any one – user to specify)
Output 1 for Temperature
4-20mA proportional to -40.0 to 60.0 ⁰C
Output 2 for % RH
4-20mA proportional to 0.0 to 100.0 %RH
Output 3 for DP
4-20mA proportional to +/-100mmWC or +/-999 Pascal.
High and Low Alarms
High and Low alarm set points for each parameter are user
programmable. In case of deviation from the set value, the front panel
LED lights and Beeper sounds (with snooze facility).
Serial Output (optional)
Isolated 2 wire RS485 MODBUS RTU - with programmable SLAVE ID
Ethernet Port (optional)
Ethernet port on RJ-45 jack with TCP/IP protocol.
Built in Memory and RTC
Real time Data storage capacity of 20,000 records in 256KB of flash
memory with built in RTC.
Membrane key board is provided for programming real time, alarm
values, MODBUS address and for calibration.
(250w x 200h x 50d) mm. - Depth of max. 30mm. from Wall surface.
Concealed flush mounting on the PUF panel or in the wall.