4–3
Operations 4.0
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
4. ALARM SET (#l and #2):
optional controls; position of dial
setting determines alarm setpoints. If dual alarms are used,
these may be set for high/low, high/high or low/low. Single
alarms can be either high or low. Dial settings can be determined
from the following formula:
X = Unknown dial setting to achieve desired alarm setpoint.
A = Analysis scale unit for low end of range.
B = Analysis scale unit for high end of range.
C = Analysis scale unit desired for alarm setpoint.
X =
(C-A)(1000)
(B-A)
For example, if the range of analysis is 20-80%, and a desirable alarm
setpoint is 30%, then A = 20, B = 80, and C = 30
X =
(30-20)(1000) = 167
(80-20)
5. RANGE: optional switch; allows changing the range by some
predetermined amount, such as 4X or 5X; i.e., dual range: low
range of 0-100 ppm and a high range of 0-500 ppm.
6. Mode: selector for units incorporating an automatic zero.
SAMPLE position is the automatic zero; ZERO position is the
manual zero; SPAN position is the manual span adjustment.
7. Meter Readout:
indicates the concentration of the component
of interest.
4.1.3 Explosion-Proof Version: Control Module
When the control module is integral with the analysis section (explo-
sion-proof), it has all of the same control functions as the remote control
module. However, the meter readout function will be performed by the
analysis section.
Since the meter readout must handle functions for both the analysis
section and the control module, some of the controls on the power module
are different from those on the general purpose unit.
The NORM/REF and NORM/MEAS switches are on the power
module in place of the MEAS/REF switch. In addition, the NORM/ZERO
switch is located on the power module.