The micro controller based humidity is used for temperature Controller. It has 4 digit 0.3"/0.5” Red 7-segment display for temperature 4 digit 0.3"/0.5” Red / Green 7-segment display for %RH. Model : DTH-723/ DTH-966

Design	Microcontroller based (8 bit) with 12 bit ADC amd DAC
Input	Temperature and %RH sensor (Pt-100 / Capacitance based) or Transmitter giving direct 4-20mA proportional to T and Rh
Range	-80.0 to 100.0°C / 200.0°C and 0.0 to 100.0 %RH.
Resolution	0.1°C / 0.1%Rh.
Accuracy	Better than ± 0.1% for temperature and ± 2% for RH.(subject to type of sensor used)
Display	4 digit 0.3"/0.5” Red 7-segment display for temperature 4 digit 0.3"/0.5” Red / Green 7-segment display for %RH
Tuning *	Auto/Manual tuning of PID values. (for model DTH-723 or 966 /C)
Control Action *	PID for heat, Humidity or De-Humidity, On/Off with time delay for cool.
Control Outputs*	4 nos. of DC pulse (0-10VDC) to operate external Solid State Relays (SSR) DTH-723 and 966/C
Alarm Outputs	High / Low alarm each for temperature and RH (total 4 outputs) DTH-723 and 966/A
Compressor mode*	Auto/ON/OFF with programmable time delay of 10 to 120 seconds.
Open Sensor Indication	Display shows Flt-1 or Flt-2 and outputs will be turned OFF.
Settings	Using front panel membrane keyboard to set the various values.
Memory Backup	Retention of PID and set values in the non-volatile memory in the event of power failure.
Interface	Serial (RS232/RS485) for PC interface with Window based software on Modbus RTU Protocol (Optional feature)
Supply	90- 260 VAC (5VA), 50/60Hz or 24VDC @ 300mA.
Size	72 x 72 x 120 mm. (DTH-723), 96 x 96 x 120 mm (DTH-966)
Panel cut out	68 x 68 mm +/- 0.5 mm.(DTH-723) , 92 x 92 +/-0.5 mm (DH-966)
Enclosure	ABS plastic with polycarbonate front (DTH-966)
Specs marked (*)	Are available only in DTH-723/C or DTH-966/C

Our range of microprocessor based humidity and temperature controller are best used for stability chambers. It has manual tuning of PID values. Model : HTC-3000/HTC-3003

Design	Microprocessor based (8 bit) with 12 bit ADC and 8 bit DAC
Input	Temperature and %RH sensor / Transmitter, (Pt-100 / Capacitance based).
Range	-80.0 to 100.0°C /200.0°C and 0.0 to 100.0 %RH.
Resolution	0.1°C / %Rh
Accuracy	Better than ± 0.1% for Temperature and ± 2% for RH.
Display	2 digit for unit°C or rH 4 digit each for process / set value. 6 digit for RTC.
Tuning	Manual tuning of PID values.
Control Action	PID and / or On/Off for Heat, Cool, Humidity & De-humidity.
No. Of Profile (for cyclic control) *	Single Program for each °C and %RH (Model HTC-3002)
Ramp Soak Steps *	1 to 10 for cyclic control (Model HTC-3002)
Time per Step *	1 to 540 mins. (9 Hr. per step). Two or more steps can be combined for longer time duration. (Model HTC-3002)
Program Hold Facility *	Manual Hold or Auto Hold (Hold back feature for guaranteed Ramp/Soak and to synchronize the temperature / humidity control). (Model HTC-3002)
Memory Backup	Retention of PID and set values in the non-volatile memory in the event of power failure.
Event Output	2 Extra Relay outputs can be used as High/Low Alarms or Day Light Effect (Relay changeover contacts rated for 5A @ 230VAC)
Control Output	DC pulses to drive external SSR for Air Heater, Boiler Heater, Compressor and High Alarm Buzzer.
External Input	Potential free contact input for water level & door switch.
Data Logging	Real Time with programmable log and storage time.
Data Storage	2K to 128K memory bank
Interface	Serial (RS232/RS485) for PC interface with Window based software on Modbus ASCII Protocol
Supply	230 / 110 VAC ± 10% (10VA), 50/60Hz or 24VDC @ 500mA.
Size	192 x 96 x 200 mm.
Panel cut out	188 x 92 mm +/- 0.5 mm.
Enclosure	Metal Powder Coated.

Our range of microprocessor based 1 to 8 channel humidity and temperature data logger are used for Validation. There are 2 to 8 sensors or transmitters that can be connected to single HTLOGGER.

Design	Microprocessor based (8 bit) with 12 bit ADC and 8 bit DAC
Input	Temperature and %RH sensor / (Pt-100 / Capacitance based) or Transmitter giving directly 4-20mA proportional to T and RH
No. of Inputs	2 to 8 sensors or transmitters can be connected to single HTLOGGER,
Range	-80.0 to 100.0°C or 200.0°C and 0.0 to 100.0 %RH.
Resolution	0.1°C or %RH
Accuracy	Better than ± 0.1% for temperature and linear to the %RH input
Display	2 digit for Channel number 1 to 8 4 digit each for process / set value or °C / rH unit 6 digit for RTC.
Open Sensor Indication	Display shows Fl-1 or Fl-2 and relays will be turned OFF.
Settings	Using front panel membrane keyboard to set the various parameters, to configure the channel and to manually scan and hold the channel number.
Memory Backup	Retention of PID and set values in the non-volatile memory in the event of power failure.
Alarm Outputs	2 Extra Relay outputs, which can be used as High/Low Alarms (Relay changeover contacts rated for 5A @ 230VAC). Open collector output per input (optional)
Data Logging	Real Time with programmable log and storage time.
Data Storage	2K to 128K-memory bank. (Duration of storage depends on log interval)
Interface (Serial and Parallel)	Serial (RS232/RS485) for PC interface with Window based software on Modbus ASCII Protocol and Parallel printer port for 80 column dot matrix printer.
Supply	230VAC / 110 VAC ± 10% (10VA), 50/60Hz or 24VDC @ 500mA.
Size	192 x 96 x 200 mm
Panel cut out	188 x 92 mm +/- 0.5 mm.
Enclosure	Metal Powder coated with ABS front and polycarbonate graphic.

With Local Display and RS485 interface in IP65 enclosure our range of micro controller based humidity comes with temperature transmitter. Model HTX-3000

Design	Micro controller based (8 bit) with 12 bit ADC and 12 bit dual DAC
Temperature Sensor	RTD (Pt-100) Class A element / 3 wire Alpha = 0.00385
RH Sensor	Laser Trimmed Thermo set polymer capacitive element
Temperature Range	-40.0 to 85.0°C
RH Range	0.0 to 100.0 %
Temperature Accuracy	"+/- 0.3°C "
RH Accuracy	+/- 2% RH, 0 -100%RH non condensing @ 25°C.
RH Lienarity	+/- 0.5% RH typical.
Temperature Compensation for RH	Built in using mathematical / software tabulation. (Over full temperature range)
Supply Voltage	24VDC @ 200mA (12 to 36VDC)
Output 1 for Temperature	4-20mA proportional to the specified and selected Temperature range (12 bit resolution). (Isolated from Supply voltage).
Output 2 for %RH	4-20mA proportional to the specified %RH range (12 bit resolution). (Isolated from Supply voltage).
Loop Resistance	RLmax = 150 Ohms with internal 5VDC supply and RLmax = 600 Ohms when external 24VDC is used – This 24VDC must be different from Supply voltage.
Display	4 digit each – 0.3” red seven segment LED for Temp. and RH.
Connection	5 wire connection for supply and current output
Serial Communication	Isolated 2 wire RS485 MODBUS RTU Slave protocol (MODBUS ID is keyboard programmable)
Enclosure (Size)	ABS plastic IP-65 (120 x 80 x 55) mm.
Sensor Stem Size	8 x 100 mm for wall mounting model HTX-3000/W and 8 x 200 mm for Duct mounting model HTX-3000/D
Model	Description
HTX-3000/W	Temp and %RH Transmitter – wall type and with local display
HTX-3000/D	Temp and %RH Transmitter – Duct type and with local display
HTX-3000/F	Temp and %RH Transmitter – Floating leads type and with local display.

In the era of computerization, the user friendliness and the usability of the computer is very common aspect in the industry. Computers are widely used for the majority of the industrial applications. In order to use the benefit and power of the PC, Libratherm offers standard, customized and dedicated computer programs or the software which runs on the window based operating platform in connection with the various Libratherm make temperature and process controllers, programmers and Data loggers to monitor the online process behaviour. Though, various industrial well known SCADA software package also do the job of PC interfacing, we still prefer to offer our own dedicated DAS software for the reason of our ability of customization, low cost and modification of the required hardware to meet the end users applications - when compared to the SCADA package. The various microprocessor and microcontroller based instruments are interfaced with the PC on RS232 serial port or RS485 bus having MODBUS RTU or ASCII protocol. Brief description of some of the software is described below: HTLOGGER software – designed to interface with our HT LOGGER, monitors and displays the temperature and humidity values at 8 different locations, which are updated every 1 second. Facility to view the real time line graph of both temperature and humidity values, can zoom in or zoom out with auto scaling of x or y co-ordinates, the data base is created in back ground which can also be seen in the tabular format with real time and date. The records can be easily searched by date, time or by the customized and user selectable field. The software can be customized to group the monitoring of single or multiples systems with suitable identifications. This computerized data logging system is suitable for validation of stability or environmental or walk-in chamber, cold storage rooms in pharma, food, petroleum and other industries.