Source Module; Sample Module; Power Module; Detector Module - Teledyne 514 Instruction Manual

1.2.1 Source Module

The source module or condulet houses the quartz iodine source lamp,
collimating lens/lens holder, and transformer. The 115 VAC power to the
source transformer is derived directly from the line voltage regulating trans-
former installed in the power module.

1.2.2 Sample Module

The insulated sample module has sample inlet and outlet lines con-
structed of 1/8" O.D. 316SS tubing. The sample is routed through a
preheater, through the sample cell, then drained from the outlet port. A
thermistor-controlled preheater and compartment space heater are powered
from temperature controllers located in the power module. A thermal cutout
switch prevents temperature "runaway".
The sample cell, which is configured for each particular application, is
provided with sapphire windows to admit NIR radiation.

1.2.3 Power Module

The power module contains a line voltage regulating transformer (with
capacitor) and three temperature controller circuit cards.
Each of the controllers incorporates a bridge circuit containing a ther-
mistor located in the volume/compartment to be controlled. Bridge imbalance
produces an error signal, resulting in operation of the final control element
(heater) to restore bridge balance, and controlling the temperature to within a
fairly narrow proportional band.
Control functions for the analysis section are located on the power
module (see Figure 4-1).

1.2.4 Detector Module

As noted above, the detector is a part of the optical system (see Figure
2-1). The detector cell is mounted within a hermetically sealed block with a
quartz window through which the optical energy enters. The assembled cell
block, together with the preamplifier subassembly, filter wheel, and filter
position sensor, are contained within a temperature-controlled compartment
In addition to the heated optical compartment, the detector module
contains the chopper motor, power transformer, and six circuit cards whose
function is described in section 2. 2. 4, Detector Module.
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
Introduction 1.0
1–5