> For the complete documentation index, see [llms.txt](https://enless.gitbook.io/centre-aide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://enless.gitbook.io/centre-aide/guides-installation/documentation-en/products/editor-16/use/optical-reading-head.md).

# Optical reading head

Learn how to correctly install your optical reading head and configure the coefficients required to accurately calculate your consumption.

## Installing the optical reading head

<table data-card-size="large" data-view="cards" data-full-width="false"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Indicator light</strong></td><td>Locate the blinking diode on the meter. The optical reader will be positioned on this diode. The optical reading head can only interpret LED flashes whose blinking duration is <strong>3 ms minimum</strong> and <strong>100 ms maximum</strong>.</td><td><a href="/files/b931949ff8fb1bbb8469170c65eb2ba9058f026c">/files/b931949ff8fb1bbb8469170c65eb2ba9058f026c</a></td></tr><tr><td><strong>Attaching the sight</strong></td><td>Clean the meter around the blinking diode. Stick the sight in place by aiming at the diode through the hole (the sight has an adhesive backing)</td><td><a href="/files/e2f8669a921f650dbe35f6a9a9695c429c82a970">/files/e2f8669a921f650dbe35f6a9a9695c429c82a970</a></td></tr><tr><td><strong>Locking the reader</strong></td><td>Screw the reader into the sight using the black plastic screw. </td><td><a href="/files/5d1089d2912cda2cb825e36ba7113f8e6ebbd6b9">/files/5d1089d2912cda2cb825e36ba7113f8e6ebbd6b9</a></td></tr></tbody></table>

{% hint style="info" %}
The optical reading head supplied with the TX PULSE LED 600-038 sensor has two switch positions: position A and position B. **The default position is position A**. **It is this position that ensures the proper operation of the optical reading head**. Please disregard position B and do not set the switch to position B.
{% endhint %}

## Consumption calculation

The data transmitted by the sensor must be converted using an additional calculation to obtain the meter's actual consumption index.

{% hint style="danger" %}
The transmitter's optical reading head records 1 pulse every 5 flashes.&#x20;

Full calculation formula = <mark style="color:red;">(</mark><mark style="color:red;">**A x 5) x B x C x D**</mark>

**A = Number of pulses measured**&#x20;

**B = Pulse weight** \
Blue tariff: 0.1W/pulse. In this case, enter 0.1 for value B in the formula above. Other tariffs: indicated on the meter interface (label or screen)&#x20;

**C = CT ratio (Current transformer)**\
Blue tariff: 1 \
Yellow tariff: 20, 40 or 100 (indicated on the meter interface)&#x20;

**D = VT ratio (Voltage transformer)**\
Blue tariff: 1\
Yellow tariff: 1\
Green tariff: indicated on the meter interface

The above calculation formula allows consumption to be calculated in Watt-hours (Wh). To obtain a value in kilowatt-hours (kWh), simply divide the value by 1000.
{% endhint %}

{% hint style="info" %}
The Pulse LED is the input to **open collector**, so it is always channel 3, that is to say input **OC**.
{% endhint %}


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