Clean Room Monitoring System – THP-301

Libratherm Instruments Pvt. Ltd.
Libratherm Instruments Pvt. Ltd.

Clean Room Monitoring System – THP-301

Product Description :

THP-301-SSC & THP-301-SSW – Only DP or T or RH Indicator Transmitter – 0.5” display (1 x 4-20mA) retransmission output and/or RS485 interface.
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Libratherm offers Mini Clean Room Monitoring System THP-302, micro-controller based Temperature, Humidity, Differential Pressure Indicator cum Transmitter with 0.5” high digital display for long-distance visibility and 4-20mA retransmission outputs for T, Rh, and DP each.


Digital interface such as RS-485 is integrated with the hardware to communicate with PC or PLC or HMI. Libratherm offers windows based PC software to monitor and store the data in a continuous or batch format for online or offline viewing and analysis in tabular or graphical format. The software allows users to prepare the batch report with desired fields such as product name, batch name, customer name, etc.


Respective sensors for T, RH, and DP are built-in to the same indicator, or alternately provision for external sensor/transmitter is available.


This Temperature and Humidity Meter is housed in an elegant SS enclosure with a depth of just 40mm and hence can be easily concealed inside the PUF panels of the clean rooms. The front facia has slanted borders to prevent dust accumulation. All input and output cable connections are accessible from the top surface and DP connections are available through suitable nozzles on the bottom.

Key Features :
  • Microcontroller based design.
  • Elegant appearance, easy to operate and compact in size.
  • Highly accurate and sturdy in operation.
  • Three color 0.5” display for simultaneous indication of T, Rh and DP.
  • Ready for both analog and digital data transmissions.
  • Stainless Steel (SS) enclosure – wall mount and flush mount.
  • RS485 interface for BMS.
ParametersDescription
SensorsExternal / Internal Capacitive / Pt-100 based T + Rh sensor and built in DP sensor.
Temperature Range-40.0 to 60.0 °C /-40.0 to 140.0 °F (any other desired range can be specified)
Temperature Accuracy +/- 0.3 °C/ °F
%RH Range0.0 to 100.0 %RH
RH Accuracy+/-1.0 %RH @ 25.0 °C or +/-3.0%RH subject to type of sensor used.
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.
DP Accuracy+/- 1% of the calibrated range.
Display of Parameter4 digits LED display each for T, %RH, and DP – 0.5" height red/green/blue
Power Requirement18 to 36 VDC (Typical 24VDC) @ 300mA (+/-10%)
or 230VAC (Anyone – user to specify) – using separate AC/DC adapter.
Output 1 for Temperature4-20mA proportional to -40.0 to 60.0 ?C (programmable range)
Output 2 for % RH4-20mA proportional to 0.0 to 100.0 %RH
Output 3 for DP4-20mA proportional to +/-100mmWC or +/-999 Pascal.
High and Low AlarmsHigh 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 OutputIsolated 2 wire RS485 MODBUS RTU - with programmable SLAVE ID
Key boardMembrane keyboard is provided for programming real-time, alarm values, MODBUS address and for calibration.
SSC - Enclosure (Size)(110w x 160h x 48d)mm-Inside Depth of max 40mm from the face of PUF panel.
SSW - Enclosure (Size)(110w x 160h x 60d)mm - Protrusion of max 60mm from Wall surface.
MountingConcealed flush mounting on the PUF panel or on the wall surface.
Sr. No.ModelSpecificationsPart No.
1.1THP-301-SSC DP Indicator in SS concealed enclosure 1801-1-1
1.2THP-301-SSCDP Indicator with 4-20mA retransmission output in SS concealed enclosure 1801-1-2
1.3THP-301-SSCDP Indicator with RS485 serial interface in SS concealed enclosure 1801-1-3
1.4THP-301-SSCDP Indicator with both 4-20mA retransmission and RS485 serial interface in SS concealed enclosure 1801-1-4
2.1THP-301-SSWDP Indicator in SS wall mount enclosure1804-1-1
2.2THP-301-SSWDP Indicator with 4-20mA retransmission output in SS wall mount enclosure 1804-1-2
2.3THP-301-SSWDP Indicator with RS485 serial interface in SS wall mount enclosure1804-1-3
2.4THP-301-SSWDP Indicator with both 4-20mA retransmission and RS485 serial interface in SS wall mount enclosure 1804-1-4

Product Category

  • Temperature Indicators
  • Large Display Temperature Indicators
  • Portable Thermometers
  • Ramp/Soak Temperature Controllers
  • Multi Zone Ramp/Soak Controllers
  • PWHT/SR Controllers
  • PID Temperature Controllers
  • On-Off Temperature Controllers
  • Temperature Data Loggers
  • Temperature Scanners
  • Temperature and Humidity Sensors
  • Temperature and Humidity Transmitters
  • Temperature and Humidity Indicators
  • Temperature and Humidity Controllers
  • Clean Room Monitoring Systems
  • Thyristor Triggering Cards
  • Zero Cross Over Triggering Cards
  • Capacitor Bank Switch Cards (RTPFC)
  • Single Phase Thyristor Power Controllers
  • Two Phase Thyristor Power Controllers
  • Three Phase Thyristor Power Controllers
  • Single Phase Thyristor Power Switches
  • Three Phase Thyristor Power Switches
  • Three Phase SSR
  • Single Phase Thyristor DC Rectifier
  • Two Phase Thyristor DC Rectifier
  • Three Phase Thyristor DC Rectifier
  • Capacitor Bank Switches (RTPFC)
  • Signal Isolator DC to DC – AC Operated
  • Signal Isolator DC to DC – 24 VDC Operated
  • Signal Isolator AC to DC – AC Operated
  • Signal Isolator AC to DC – 24 VDC Operated
  • Signal Isolator Temp to DC – AC Operated
  • Signal Isolator Temp to DC – 24 VDC Operated
  • Signal Isolator Frequency to DC Signal
  • Signal Isolator with Display
  • Load Cell Signal Conditioners
  • Temperature Transmitters
  • Process Transmitters
  • DC Motor Controllers
  • Motor Soft Starters
  • Molten Metal Pyrometers
  • IoT Modules
  • Instrumentation Control Panels
  • Product Accessories
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