Teracom TCG120-4, User Manual

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TCG120-4_R1.3 – May 2022 Page 15
and offset. When we know them, we can calculate what relative humidity corresponds to
every voltage in the working range.
The multiplier (MU) is calculated as ΔY/ΔX, for this sensor ΔRH%/ΔV:
MU = (75.3 - 0)/(3.198-0.826) = 75.3/2.372 = 31.745 %RH/V
The offset is calculated from the already known multiplier and relation for one of the
points:
OF = MU * (0 – VOUT1) + RH1 = 31.745*(0-0.826) + 0 = 31.745*(-0.826) = -26.22
The same result can be calculated for the second point:
OF = MU * (0 – VOUT2) + RH2 = 31.745*(0-3.198) + 75.3 = -101.52 + 75.3 = -26.22
For this sensor, the formula will look like this:
SV = RV * 31.745 – 26.22
Check for VOUT = 0.826 V (0%RH):
SV = 0.826 * 31.745 – 26.22 = 26.22 – 26.22 = 0 %RH
The same value is written in the datasheet.
7.2.3.4. Relay outputs
For every relay, a description, up to 15 characters can be set. These descriptions will appear in
the monitoring page, XML/JSON data, SMS and e-mail alerts.
The pulse duration can be different for every relay. The resolution is 0.1 second, the maximum
pulse value is 3600 seconds.
All relays can be activated either remotely by SMS/HTTP API or locally from the status of a
monitored parameter. This setting is made from the “Activated from” drop -down menu, the
possible options are:
•
SMS/HTTP - by selecting this option the relay outputs can be activated by SMS from
an authorized number or by sending HTTP API commands;
•
Local activation .
For local activation, alarm conditions for different sources are used. They are set up in section
“Setup ->C onditions”. To assign a parameter to the relay, the following choices are possible:
•
S? – “S” stands for “ S ensor 1- Wire”. The relay is activated from the value measured
from the specified 1-Wire sensor and rules for ranges specified in “Setup -
>C onditions”. Question mark masks a number from 1 to 4;
•
Analog input? . The relay is activated from the value measured by specified analog
input and rules for ranges specified in “Setup ->C onditions”. Question mark masks a
number from 1 to 2;
•
Digital input? . The relay follows the state of the specified digital input. Question
mark masks a number from 1 to 2;
•
Any alarm. The relay is activated on any alarm condition.
All changes in the above sections are saved by pressing the “Save” button.