Teledyne 238 - Thermal conductivity analyzer - Manual (Page 8)

Teledyne Analytical Instruments 1-4
1 Introduction Model 235
1.2.4 E to I Converter Board (standard)
The standard current output in the form of an isolated 4–20 mA dc
current is supplied by the E to I converter circuit. The output of this board
is proportional to the percentage of range, for example, 4 mA for 0% and
20 mA for 100% of range. This current output is in addition to the 0–1 V dc
voltage output.
1.2.5 Linearizer Board (optional)
An excellent alternative to the use of correction curves is available as
an option with the Series 235 Analyzer. A digital linearizer circuit is avail-
able as a plug-in PC board. This is a very flexible circuit that produces a
linear correction to a wide variety of non-linear curves. The result is an
output signal which is linear over the specified analysis range or ranges.
When employed, the digital linearizer is transparent to the user and requires
no adjustment.
1.2.6 220 to 240 Volt Operation (optional)
The Series 235 analyzer is available for either 110-120 (standard) or
220-240 (optional), 50 or 60 Hz operation.