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ACTION:Directsnap;PilotOutputPressure“snapson"withtemperaturerise

詳細(xì)介紹

ACTION:
Direct snap; Pilot Output Pressure “snaps on" with temperature rise.
APPLICATION:
Used to control temperature in indirect and direct heaters, emulsion treaters, reboilers, steam generators, heat exchangers, cooler shutter controls, and salt bath heaters.
WORKING PRESSURE (sensing element):
psig kg/cm2
500 35.15 max. without Separable Socket
4000 281.23 max. with Separable Socket
7000 492.15 max. with Special Separable Socket
Separable Socket is an extra price item and must be ordered separately, if desired. To order Separable Sockets refer to Table of Contents.
TEMPERATURE RANGE:
T 12S, T 18S -30°F minimum to 400°F maximum
-34°C minimum to 204°C maximum
HT 12S, HT 18S -30°F minimum to 750°F maximum
-34°C minimum to 399°C maximum

OPERATION:
These Thermostats each consist of an Indirect Acting Throttle Base Assembly which is connected to a 3 PS Pilot providing a Direct Snap Output Signal. The 3 PS Pilot also acts as an amplifier increasing the sensitivity of the Base Assembly.
Assume the set temperature of the Thermostat is above the temperature of the system being controlled. As the system temperature rises, the STAINLESS TUBE increases in length to move the Thermostat Diaphragm (or Bellows) Assembly in a direction to first close the seat at BALL 1 (Violet to Orange) and open the seat at BALL 2 (Orange to Atmosphere). As Variable Pressure (Orange) decreases, the 3 PS Pilot Diaphragm Assembly moves upward to close the seat at BALL 4 (Yellow to Atmosphere) and open the seat at BALL 3 (Violet to Yellow). Increasing Pilot Output Pressure (Yellow) helps move the 3 PS Pilot Diaphragm Assembly upward and thereby produces a “snap on" pilot action. Output Pressure (Yellow) is sent to cause the desired Pilot or Motor Valve action.
As the system temperature decreases, Variable Pressure (Orange) increases, the Pilot Diaphragm Assembly is forced downward to close the seat at Ball 3 (Violet to Yellow) and open the seat at BALL 4 (Yellow to Atmosphere). Venting of Pilot Output Pressure (Yellow) permits the Pilot Diaphragm Assembly to move downward more rapidly, producing a “snap off" pilot action. Output Pressure (Yellow) is vented causing the desired Pilot or Motor Valve action.
The 112 SMT is the recommended Motor Valve for this thermostat configuration. Refer to “Burner Valves" in the Table of Contents for more information.
SUPPLY PRESSURE:
5 to 30 psig
.35 to 2.11 kg/cm2
RESPONSE RANGE：
T 12S - 4.5°F, 2.5°C
T 18S - 3°F, 1.7°C
HT 12S - 3°F, 1.7°C
HT 18S - 2°F, 1.1°C