Structure And Function; Device Description; Working Principle - Honeywell S1 Manual De Instrucciones

Honeywell

2. Structure and function

The ENCODER S1/S1D products are opto-electronic read-out units with
digital data transfer for turbine and rotary gas meters from Elster/Honeywell.

2.1 Device description

The encoder is integrated in an Elster/Honeywell meter index. The
technology is based on opto-electronic scanning which identifies the
position of the individual rollers on the mechanical index in a contact-free
process. The reading process for the Absolute ENCODER is therefore
identical to the manual reading of the mechanical index on site. Operation
of the Absolute ENCODER requires neither a battery nor an individual power
supply, as the power required for reading is supplied by the connected
device. The described technology can be flexibly adjusted to the application
by choosing one of the optional interface types.

2.2 Working principle

The digit rollers of the mechanical index are individually scanned by opto-
electronic means. Each roller has three asymmetrically arranged slots of
different lengths which are then scanned by five beams of light to determine
their position. The respective position of the roller and thus the digits on the
roller can be clearly identified thanks to the specific arrangement of the slots.
The light barriers consist of phototransistors, LEDs and optical waveguides
which are all scanned and evaluated one after the other using time-series
analysis. Control and evaluation of the light barriers is carried out by a
controller. This exactly defines the position of each individual digit roller and
transmits it to the connected add-on device (e.g. volume conversion device,
data logger or bus system) as part of a defined protocol. Depending on the
interface type, the protocol already includes various meter data such as the
factory number and meter size. The plug-and-play system means that no
subsequent parameterization is required.
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