\startcomponent dtr

% This tells ConTeXt where it can locate
% the figures used in this chapter
\setupexternalfigures[directory={./dtr}]

% List of figures used in this chapter
\useexternalfigure[dtr][dtr_pic]
\useexternalfigure[linearized curve][linearized_curve]%[height=4cm] %was 2.51
\useexternalfigure[algorithm][algorithm][height=4cm] %was 2.52
\useexternalfigure[dtr mounting][dtr_mounting]%[width=\textwidth]
\useexternalfigure[sensor connections][sensor_connections][width=.8\textwidth] %pic originally drawn for Best Practices manuals
%		  [height=8cm] %new
\useexternalfigure[open front panel][open_front_panel]
		  [height=8cm] %new
\useexternalfigure[external power switch][external_power_switch]
		  [height=6cm] %new
\useexternalfigure[motherboard][motherboard][width=.8\textwidth]
\useexternalfigure[motherboard_24v][motherboard_24V][width=.8\textwidth]
\useexternalfigure[reset][reset_cropped]


%----------------------------------------------------------
% The document itself starts here
%----------------------------------------------------------
\starttext

% First level heading here
% Text in [brackets] is used for reference
% text in {curly brackets} is the visible heading
\chapter[dtr]{Indicating transmitter DTR}

% Second level heading here
% Text in [brackets] is used for reference
% text in {curly brackets} is the visible heading
\section[section:dtr description]{Indicating transmitter description}
\index{Indicating transmitter+description}


The Indicating transmitter DTR is a specialized computer designed to
process data received from one or two sensors. The Indicating
transmitter enclosure (\in{Figure}[fig:dtr]) contains a front panel
with a backlit \index{display}Liquid Crystal Display (LCD) and a
\index{keyboard}keyboard. The front panel swings open to give access
for connections and service. Knockout padlock provisions are included
in the enclosure's both cover latches for locks to prevent
unauthorized access.

\placefigure
    [here][fig:dtr]
    {The Indicating transmitter enclosure}
    {\externalfigure[dtr]}


The sensors send the values of the refractive index nD and the
\index{temperature+process}process temperature T to the DTR.  The
microprocessor system then linearizes the concentration reading
(example in \in{Figure}[fig:linearized curve]), and performs an
\index{temperature+compensation}automatic temperature compensation.


\placefigure
	[here,force][fig:linearized curve]
	{A linearized curve}
	{\externalfigure[linearized curve]}

\page

\section[section:dtr mounting]{Mounting Indicating transmitter}
\index{Indicating transmitter+mounting}

The Indicating transmitter is mounted indoors, it should preferably be located in an easily
accessible, well lit and dry area. Avoid vibration. Take interconnecting
cable length into consideration when choosing the mounting location.

The enclosure is mounted vertically on an upright surface (wall) using
four mounting feet, see \in{Figure}[fig:dtr mounting]. The LCD is best
viewed when approximately on the eye level of the user.

In sanitary installations, the recommendation is to use a DTR with stainless steel enclosure. If standard polycarbonate enclosure is used, it should be installed as remotely as practical from the product areas or connections.

\getbuffer[imp] Do not drill mounting holes in
the enclosure as that will affect the protection class of the
enclosure and damage the electronics.

\placefigure
    [here,force][fig:dtr mounting]
    {Indicating transmitter: dimensions (mm/in)\crlf and mounting feet measures}
    {\externalfigure[dtr mounting]}


\getbuffer[note] The \index{display+temperature range}LCD display has an
operating temperature range of 0--50~\textdegree C and a storage temperature
range of -20--60~\textdegree C.

\getbuffer[imp] The DTR does not have a built-in power
switch. The system is always powered on when connected to a power
source.  Mounting an external
\index{power+external power switch}power switch to control the DTR's power supply is recommended,
\in{Figure}[fig:external power switch].



\section[section:electrical connections]{Electrical connections}

\subsection[section:interconnecting]{Interconnecting cable}
\index{interconnecting cable}

The cable contains a pair of twisted signal wires (1,~2) and a cable
shield (3) (see \in{Section}[section:sensor connection] and
\in{Figure}[fig:motherboard]). Standard delivery is 10~meters (33~feet)
of cable. The maximum length of an interconnecting cable is 200~m
(660~ft). The signal wires (1,~2) are interchangeable
(non-polarized). The cable shield is connected to the protective earth
at the Indicating transmitter.

The junction box enables the use of customer's own cable as long as it
meets IEC~61158|M|2 type A standard requirements, see
\in{Section}[section:cable specs],
\about[section:cable specs].


%forced page break
%\page

\subsection[section:sensor connection]{Connecting sensor}\index{sensor+connecting+standard sensor}

\getbuffer[imp]  Sensor connector may not be connected or disconnected when the circuits are energized. Switch OFF the power from Indicating transmitter DTR external power switch before disconnecting the sensor cable from the sensor. After connecting sensor cable back to the sensor you can switch power back on.

\startitemize[n,packed]

\item Remove the four screws holding the
\index{sensor+nameplate}Sensor nameplate (\in{Figure}[fig:sensor
connections]). The terminal strip is under the nameplate.

\item Connect the signal wires to terminal (1) and (2), and the
cable shield to terminal (3).

\item Tighten up cable gland. Screw nameplate back on.

\stopitemize

\placefigure
	[here,force][fig:sensor connections]
	{\index{power+indicator light}Sensor electrical connections}
	{\externalfigure[sensor connections]}


\page


\subsection[section:connecting dtr]{Connecting the Indicating transmitter}\index{Indicating transmitter+connecting}


All the electrical terminals of the Indicating transmitter are behind the
Front panel. To access them, first open the enclosure cover. Then
loosen the front panel screw (\in{Figure}[fig:open front panel]) and
swing open the Front panel. All terminals are now accessible.


\placefigure
	[here,force][fig:open front panel]
	{Opening the Front panel of the Indicating transmitter}
	{\externalfigure[open front panel]}

\placefigure
	[here,force][fig:external power switch]
	{The recommended external \index{power+switch}power switch, spare part nr PR-10900. The ratings of the switch are 10A/230V.}
	{\externalfigure[external power switch]}

\getbuffer[warn] {\bf Check that the power is off before opening
the Front panel.} If the {\it green power indicator light}
(\in{Figure}[fig:open front panel]) is on, there is still power in the
system. To completely turn the power off, use the external power switch. The external power switch shall be installed in accordance with the local installation requirements.

%\page


\placefigure
	[here,force][fig:motherboard]
	{\index{Indicating transmitter+motherboard}Motherboard of
	the Indicating transmitter for AC power}
	{\externalfigure[motherboard]}

\placefigure
    [here,force][fig:motherboard 24V]
    {Motherboard of the Indicating transmitter for 24V DC power}
    {\externalfigure[motherboard_24v]}


\page

Description of the terminals on the H1 interface card PR-10701 and on
the Transmitter motherboard PR-10600 (\in{Figure}[fig:motherboard]):

%\blank[big]

\bTABLE
\setupTABLE[c][each][frame=off]
\setupTABLE[r][each][topframe=on,style=\ssx]
\setupTABLE[r][last][bottomframe=on]
\setupTABLE[c][2][rightframe=on]
\setupTABLE[r][1,4][rightframe=on]
\setupTABLE[c][1][style=\ssx\bf,leftframe=on]
%
\bTR
    \bTD[nc=2] On H1 \eTD
\eTR
%
\bTR
    \bTD A 1 2 3 \eTD
    \bTD Connection for Sensor A, signal wires~(1,~2), cable shield~(3). \eTD
\eTR
%
\bTR
    \bTD B 1 2 3 \eTD
    \bTD Connection for Sensor B, signal wires~(1,~2), cable shield~(3). \eTD
\eTR
%
\bTR
\bTD[nc=2] On Motherboard \eTD
\eTR
%
\bTR
    \bTD 11 12 \eTD
    \bTD \index{4--20 mA}4--20~mA output 1, positive~(11), negative~(12), max.~load 1000~Ohm, galvanically isolated. \eTD
\eTR
%
\bTR
    \bTD 13 14 \eTD
    \bTD 4--20~mA output 2, positive~(13), negative~(14), max.~load 1000~Ohm, galvanically isolated. \eTD
\eTR
%
\bTR
    \bTD 21 22 \eTD
    \bTD \index{relay+location}Relay 1, one contact output, max.~250~V~AC, max. 3~A. \eTD
\eTR
%
\bTR
    \bTD 23 24 \eTD
    \bTD Relay 2, one contact output, max.~250~V~AC, max. 3~A. \eTD
\eTR
%
\bTR
    \bTD 31 32 33 \eTD
    \bTD Power, L (31), N (32), protective earth (33), 100-240~V~AC, 50--60~Hz. An external
    \index{power+switch}power switch (\in{Figure}[fig:external power switch]) is recommended. \eTD
\eTR
%
\bTR
    \bTD 41 42 \eTD
    \bTD  24V terminal for DTR internal use only.\crlf
    \getbuffer[note] Connecting terminal to external 24V supply will void warranty.
    Connecting external devices to 24V terminal will void warranty. \eTD
\eTR
%
\bTR
    \bTD 51 52 53 54 55 \eTD
    \bTD \index{input switch}Switch inputs: switch~1~(51), switch~2~(52), switch~3~(53), switch~4~(54)
    and common 3 volts for all inputs (55). The switch terminals are galvanically isolated. \eTD
\eTR
%
\eTABLE

% \page

\subsection[section:power terminals]{Power terminals for AC power}
\index{power+terminals (AC power)}

The primary AC power is connected to a separate terminal strip
31/32/33 marked {\tt POWER} in the lower right-hand corner of the
Motherboard (\in{Figure}[fig:motherboard]). The three terminals are
marked 31/L, 32/N and 33/\low{\externalfigure[pe_3mm]} (protective earth). The
power terminal 33/\low{\externalfigure[pe_3mm]} is directly connected to the exposed metal parts
of the Indicating transmitter DTR. Wiring to the terminals shall be 1.5mm\high{2} minimum. The protective fuse in the building system shall comply with the local requirements.

\subsection[section:power terminals]{Power terminals for 24V DC power}
\index{power+terminals (24V DC power)}

The DC power is connected to a terminal stripe marked POWER in the lower right-hand corner of the Motherboard (\in{figure}[fig:motherboard 24V]). The three terminals are marked +, - and \low{\externalfigure[pe_3mm]} (protective earth). The power terminal \low{\externalfigure[pe_3mm]} is directly connected to the exposed metal parts of the Indicating transmitter DTR.

The 24V DC power to this terminal stripe shall be supplied from a secondary circuit which is double or reinforced insulated from the mains supply within the limits for a limited-energy circuit (maximum 200 VA/U) according to the IEC 61010-1.


\subsection[section:reset button]{Reset button}
\index{reset button}


It is possible to reset and restart both the Indicating transmitter
DTR and the sensor(s) by pushing the reset button. The button is
accessed through the cable hole in the front panel shield (see
\in{Figure}[fig:reset] below). You need a thin stick or similar utensil, preferably of
non-conducting material, to reach the reset button. After pressing the
reset button, the display will black out for a few seconds. The
instrument will be back to full operation within 30 seconds.


\placefigure
	[here,force][fig:reset]
	{Location of the reset button}
	{\externalfigure[reset]}





\stoptext
\stopcomponent
