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2.2 CONTROL/INDICATOR UNIT (Figure 4)
A.
Function switch (S1) - applies power to the various system supplies, and provides
the following functions:
OFF - no power applied to any circuit.
DEW POINT - normal operating position. Allows system to maintain an
equilibrium condensation layer on the mirror.
BAL - heats the mirror to 40° C to evaporate condensation. Allows system
to be balanced with a dry mirror. Do not leave in this position once balance
routine is initiated or it will repeatedly balance mirror. Switch back to DEW
POINT position once REBALANCE LED lights
MAX COOL – switch position that applies full cooling current to the
thermoelectric cooler. This is used to (1) determine whether there is
adequate cooling when the system is operating at very low frost points, and
(2) convert any supercooled water deposit to frost.
B.
Digital Panel Meter (M1) – allows direct readout of dew point data.
C. D/F Point LED - blue LED indicates if unit has stabilized on a dew or frost point.
D.
REBALANCE LED. Lights when a balance routine is performed. If it stays light
after balance finishes, this indicates that mirror is becoming contaminated and will
need to becleaned soon.
E. SERVICE MIRROR LED. This LED flashes to indicate that mirror is too
contaminated for proper operation and needs to be cleaned.
F. Main Connector J8 - for cable leading to control unit.
Содержание 1011C
Страница 7: ...7 C B A Figure 1 Dew Point Hygrometer System shown with optional cables...
Страница 9: ...9...
Страница 12: ...12 Figure 3 Dew Point Sensing Unit A B C...
Страница 14: ...14 Figure 4 Control Indicator Unit F A B C D E...
Страница 17: ...17 Figure 6 Power Unit Internal...
Страница 23: ...23 Figure 9 Flow Test Fixture Hookup...
Страница 28: ...28 FIGURE 10 System Response Characteristics...
Страница 31: ...31 Recommended cable Belden YQ27540 Figure 11 Wiring Diagrams...
Страница 32: ...32 Recommended cable Belden YQ27540 Wiring Diagrams Continued...
Страница 33: ...33...
Страница 34: ...34 Figure 13 Vapor Pressure e vs Dew Point TD or Saturation Vapor Pressure es vs Temperature T...
Страница 36: ...36 Figure 15...
Страница 37: ...37 Figure 16 Aspirating Fixture Hookup...
Страница 38: ...38 Figure 17 1011C Hygrometer Complete...
Страница 40: ...40 Table 2 Dew Point to Frost Point Conversions...
Страница 41: ...41 Table 3 Dew Point Error due to Pressure Change in Sampling System...
Страница 47: ...47...
Страница 48: ...48...