Setra System Model C280E - Manual

General Information
Your Setra transducer has been carefully calibrated before shipment to you and, it should be
handled with the same care given any precision instrument. Pressure ranges and dimensions
are reported on the specification bulletin for the transducer.
Installation
Do not use in ambient conditions corrosive to stainless steel, submerge in liquids, subject to
spray or drip, or in a high vibration environment. The 280 Series is slightly sensitive to accelera-
tion in the pressure fitting axis, less than 0.05 psi/g typical. Factory calibrated in the vertical
position, with pressure port downward, this position often minimizes potential damage from
dripping of pressure system piping.
Installation of pressure fitting:
For very high pressure we suggest using a sealant such as Loctite hydraulic sealant. For
other pressure ranges, standard sealants such as teflon pipe tape generally are satisfactory.
For the most sensitive pressure ranges, excessive torquing of a metal pressure fitting may
cause slight zero shift which may be trimmed out using zero adjustment. Use of plastic fit-
tings often shows no noticeable zero shift. The torquing effect does not appreciably affect
linearity or sensitivity. Use the wrench flats on the 280E or C280E when attaching to fittings.
Atmospheric Reference (Gage pressure units only)
Lower range units are subject to excessive thermal zero shift unless vented to atmosphere.
The 280E Series gage pressure transducers and transmitters are vented to atmosphere at
the connector end where the edge card protrudes from the case. Do not seal around the
edge card.
Electrical Connections
280E (.030 - 5.03 VDC output)
For 24 VDC Excitation (Nominal)
+ IN Connect to 15-30 VDC Power Supply.
+ OUT Connect to Control of Pressure Monitor.
COM. Connect as Common Return Lead for + IN
and + OUT.
Caution:
Care must be taken when installing this transducer that the excitation voltage is not ap-
plied to the output lead by mistake. Excitation power, or voltage in excess of 30 VDC, inad-
vertently applied to the output lead may damage the electrical circuit. Shielding or other
precautions should also be provided to assure that transient voltages in excess of 30 VDC
are not applied to the output lead.
C280E (4-20 mA output)
The circuit is designed to operate as a true two-wire 4 to 20 milliampere pressure transmit-
ter and will deliver rated current into any external load between zero and 800 ohms.
Operating Instructions
Models 280E/C280E Pressure Transducer and Pressure Transmitter
Three-Wire, Voltage Output—Two Wire, Current Output