Plug-In Circuit Boards; Cell Power Supply/Amplifier Board; Differential Power Supply Board; Alarm Comparator Board (Optional) - Teledyne 235 Operating Instructions Manual

235 series thermal conductivity analyzer

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Table Of Contents

Table of Contents

Thermal Conductivity Analyzer

All electrical interconnections are made to the terminal strips on the

mother board; this board also contains an unusual feature — a series of

regularly-spaced holes in a rectangular pattern, known as a "kludge" space,

is set aside for the installation of circuitry for special customer requirements.

1.2

Several options are available as convenient plug-in circuit boards;

although these may not all be present in the specific instrument under

consideration, a brief description of some of the more common ones is

offered below, and noted as (optional); PC boards which are not noted as

(optional) are standard features.

1.2.1

This circuit contains an IC regulator that holds the voltage through the

cell to 4.5 V. It also contains a 2-stage IC amplifier, with range resistors.

1.2.2

15 Volts, regulated (for electronic amplifiers, etc.), and +24 volts, non-

regulated (for alarm and relay circuitry and certain other functional uses) are

supplied by this circuit.

1.2.3

The comparator alarm circuit is available in single or dual configura-

tions, which can be supplied as high or low alarms, energized above or

below setpoint; adjustment of each alarm setpoint is made using a potenti-

ometer provided on the instrument's front panel. Power failure or "fail-safe"

alarming can also be provided. Refer to the specifications covering one

individual analyzer for details regarding specific alarm or other optional

provisions.