www.lumel.com.pl

3

WHAT PARAMETERS CAN BE MEASURED BY HT20?

HT20, HT20IoT -TEMPERATUREANDHUMIDITYMONITOR

FEATURES

oC

Ethernet

INPUTS

OUTPUT

RTC

WEB

server

FTP

server

SMTP

client

@

• temperature,

• relativehumidity,

• dewpoint,

• absolute humidity or the total mass of water vapour (in grams) present in 1m3

ofairinagiventemperature,

• wet-bulbtemperature,

• vapour pressure or the pressure at which, in a given temperature, the gas is at an

equilibriumwiththefluid(equilibriumbetweenevaporationandcondensation),

• enthlapy(totalheatcontent).

HOW DOES HT20 WORK IN CASE THE PRE-SET

PARAMETERS ARE EXCEEDED?

The HT20 allows up to two defined warnings. Whenever the pre-set parameters are

exceeded,theHT20willimmediatelysignalthisvia:

• emails,

• messagesonadedicatedwebsite,

• specialsymbolsonthedisplay,

• audiblealerts.

Therefore, every time the HT20 is connected to the Internet, you will always have

themostup-to-dateinformationontheactualconditionofthemonitoredfacility.

The HT20 is equipped with the Ethernet interface enabling its connection

to the local or global network (either LAN orWAN).Thanks to the user-friendly

and intuitive ‘www’ server, you will always have access to the information

regarding:

• currentmeasurementvalues,

• devicestatus.

The‘www’servercallalsoallowyouto:

• configureit

• readtheserialnumber,manufacturingcode,softwareversionandbootloader

version.

The built-in FTP server allows for fast and easy access to archive data files

from the level of web browser or from other FTP clients. The DHCP protocol

provides automatic configuration of the monitor in the computer network,

whereas the SMTP protocol is responsible for sending the warnings via emails.

The HT20 monitor can also work in more extensive systems where

the communication protocol Modbus Slave TCP/IP provides a smooth

and reliable reading of all current measurement data.

ETHERNET INTERFACE AND ITS FUNCTIONALITY

MEASUREMENTS ARCHIVE

Thanks to the dedicated website, you can also check the archive data using

a smartphone, tablet or a PC. There is no need to be worried about insuffi-

cient memory on the device; the HT20 has an 8GB internal file system memory

where the data form the internal memory buffer (4GB) is automatically

recorded as files. The memory has a form of a circular buffer and after

the storage is full, the oldest files are overwritten. The internal archive can be

read, copied and/or deleted.