CHAPTER 3
OPERATION
3.0 GENERAL
This chapter provides operating instructions for most features of the Model
211 Temperature Monitor. Corresponding computer interface instructions
for these features are provided in Chapter 4.
3.1 INSTRUMENT POWER
The Model 211 is powered on by plugging in the power supply. There is no
power switch on the instrument. When the Model 211 is powered on, every
segment on the display will illuminate for a few seconds to indicate
instrument initialization. Most of the instrument setup parameter values are
retained when powered off with one exception. The latching alarm will reset
itself on power-up. When the instrument is powered on for the first time,
parameter values are set to their defaults, listed in Table 3-6.
When initialization is complete, the instrument will begin its normal reading
cycle and temperature or sensor units readings should appear on the display.
Messages will appear in the reading location on the display if the
measurement input has not been fully configured. Messages listed in
Paragraph 5.3.1, Instrument Hardware Errors, are related to the instrument
hardware, and may require help from Lake Shore service. The messages
listed in Paragraph 5.3.2, Limit Errors, do not indicate a problem with the
instrument, and will disappear when input setup is complete.
The Model 211 should be allowed to warm up for a minimum of 30 minutes
to achieve rated accuracy.
3.2 DISPLAY DEFINITION
The Model 211 has a 6-digit LED display capable of showing both numeric
and character data. In normal operation, the display shows the current
sensor reading in sensor units or temperature units. The four annunciators
below the right hand side of the display indicate what units the display is
reading. Other display configurations appear during parameter setting and
data entry operations. These displays are illustrated in their individual
operation paragraphs.
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