Setra System Model C280E - Manual (Page 2)

Adjustments (with cover removed)
CAUTION: TURN OFF
EXCITATION POWER DUR-
ING COVER REMOVAL OR
REPLACEMENT.
Zero Pressure Output
Factory adjusted to 30mV nominal and can be adjusted by the air trim capacitor as shown
in diagram. Changing zero may begin to change sensitivity. Note: This product has a 1/2%
FS cover effect for zero only (span is not effected). Please take the cover effect into consid-
eration when adjusting the zero pressure output.
Sensitivity
Can be adjusted by potentiometer as shown on diagram. Unit factory adjusted to order
specifications.
Other Adjustment
Adjusted at factory. Do not touch.
Zero Pressure Output
Zero output can be adjusted ±0.2 milliamperes about the nominal 4 mA. The zero adjust-
ment is the air capacitor shown in the diagram. Changing zero may begin to change sensi-
tivity. This product has a
1/2% FS cover effect for zero only (span is not effected). Please take the cover effect into
consideration when adjusting the zero pressure output.
CAUTION: The C280E Series is designed to have current flow in one direction only — please
observe polarity. We suggest that the electrical cable shield be connected to the system's
loop circuit ground, thereby improving electrical noise rejection.
Excitation
Minimum supply voltage (VDC) = 18 + 0.02 x (resistance of receiver plus line).
Maximum supply voltage (VDC) = 32 + 0.004 x (resistance of receiver plus line).
Calibrated at factory using a 250 ohm load at 24 VDC.
Variations in the power supply voltage cause less than 0.02 mA change in the transmitter’s
current output, per volt change in the power supply.
Termination
Spade terminals are provided and can be crimped onto each (16-22 AWG) conductor. If you
prefer, an optional edge card connector is available (Setra P/N 280202) for quick disconnect
of cable from transducer. A protective cover is provided for the electrical terminals. The
material is polyvinyl chloride (PVC). It fits closely over the end of the electrical cable, screw
terminals and first 3/4" of transducer cover. It protects the electrical connection from inad-
vertent contact with splashing or dripping fluids.
Adjustments (with cover removed)
CAUTION: TURN OFF
EXCITATION POWER DUR-
ING COVER REMOVAL OR
REPLACEMENT.