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Product Specification :
Model wise descriptions :

Model Products Description

Microprocessor based (8 x 2)channel Temperature & %RH Logger with Printer port, RS-485/RS-232 Serial port and Extra 128KB of memory bank.

(X = 2,4,6,8)

Description :

Libratherm offers Microprocessor based Temperature and Humidity Scanner / Data logger Model HTLOGGER, for monitoring temperature and humidity at maximum 8 various locations or at various points in the stability chamber or in the walk in chamber, storage rooms, computer server rooms, or other similar systems requiring simultaneous and accurate measurement of T and Rh.

HTLOGGER is 8 channel data logger and it can accept 1 to 8 T + Rh inputs from combined sensor or transmitter. The instrument displays the temperature / %Rh values on 4 digit 7-segment Red LED display with respective channel number and unit of measurement.

In addition to this the HTLOGGER has many other useful features such as Separate display to indicate Real time clock / calendar. In-built data storage facility, which can be retrieved on demand or can be down loaded on to a computer or on a printer for hard copy via the printer port in both off line and on line mode. The data storage capacity depends on the log interval and the number of channels. Internal 128KB of memory allows 3000 records of storage.

This instrument is provided with a Serial communication port RS 232 / RS 485 for interfacing to a computer for data logging and storage. Specially written window based software does the on line data logging and plot the graph with respect to the time on the PC. Special 2 level Pass Word protection (operator & supervisory) prevents unauthorized tempering of the stored data and programmed parameters.


Features :

• Microprocessor based design.
• Separate display for Temperature/RH, process point and Channel and real time clock.
• Easy front panel keyboard programmable.
• Channel Hold/Scan facility.
• Programmable scan time, log time and data storage interval

Application :
• Validation of HVAC systems
• Environmental Test Chambers
• Walk In Chambers
• BOD Incubator etc

Technical specifications :

No. of Inputs 2, 4, 6, 8, (1 + 1 to 8 + 8 Temperature and Humidity).
Input types Temperature and %RH sensor / Transmitter (Refer table given below).

-40.0 to 100.0 oC or 150.0 oC and 0.0 to 100.0 %RH.

(Subject to type of input – refer table given below )

Resolution 0.1 oC or %RH
Accuracy Better than ± 0.1% for temperature and linear to the %RH input

2 digit 0.5” Red 7-segment LED display for channel no.

4 digit 0.5” Red 7-segment LED display for process parameter.

4 digit 0.5” Red 7-segment LED display for process value.

6 digit 0.3” Red 7-segment LED display for Real Time Clock / Calander

Open Sensor Indication Display shows fault message.
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).

Max. 16 Open collector output can also be provided for external relays. (optional)

Data Logging Real Time with programmable log interval and storage time.
Data Storage 2K to 128K-memory bank. (Duration of storage depends on log interval)

Serial / Parallel


Parallel Centronics port (25 pin D connector) for 40 or 80 column dot-matrix printer.

Serial (RS232 4 wire or RS485 2 wire)port on modbus ASCII protocol. USB interface can also be optionally provided.

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.

Input Sensor / Transmitter and Range Selection Table :
(Which can be used with above Data Logger)

Sensor / Transmitter A1 A2 A3
Type Transmitter Sensor Transmitter
Make Libratherm Rotronic – Swiss make Rotronic
Temp. Sensor Hygroclip-CP In-built In-built
Supply 18-24VDC (5-24) VDC (5-24) VDC
%Rh O/P 4-20mA 0 TO 1 VDC (4-20) mA DC
% Rh Range 0 to 100% 0 to 100%RH 0 to 100%
Accuracy +/-1.5% @ 23 oC +/- 1.5 %RH @23 oC +/- 1% RH
Temp. O/P 4-20mA 0 to 1 VDC (4-20) mA DC
Temperature -40 to 60 oC -40 to 60 oC -40 to 150 oC.
Accuracy +/- 0.5% +/- 0.5% +/- 0.5%
Std. Cable Length 1 meter with sensor 2 meter 2 meter
Transmitter Enclosure ABS IP 65 -- ABS-IP65
Transmitter Size 85 x 85 x 55 mm -- 120 x 85 x 55
Sensor Size 15 x 140 15 x 140 15 x 200
  Microprocessor based temperature humidity controller Microprocessor based temperature humidity controller Microprocessor based temperature humidity controller


Process Control Instruments

Process Control Instruments