CAUTION:
The 280G 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) = 9 + 0.02 x (resistance of receiver plus line).
• Maximum supply voltage (VDC) = 30 + 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.
Calibration
Every model 280G is factory calibrated and should require no field adjustment. Whenever possible,
any zero and/or span offsets should be corrected by software adjustments in the user’s control sys-
tem. However, both zero and span adjustments are accessible by removing the pan head screws and
turning the zero and span potentiometer screws inside. Pan Head screws should be replaced after
adjustment to maintain enclosure rating. Voltage output units are factory calibrated into a 50 K load.
Voltage units are operable into a 5000 load or greater. The zero factory setting is ±50 mV. Current
outputs units (4-20 mA) are factory calibrated with a 24 VDC loop to supply voltage and a 250 load.
The zero factory setting is a ±0.08 mA. The span (full scale) factory settings is ±0.16 mA. Zero and
span adjustment are approximately ±1.0 mA.
Returning products for repair
Please contact Setra (1-800-257-3872, 978-263-1400) before returning unit for repair to review in-
formation relative to your application. Many times, only minor field adjustments may be necessary.
When returning a product to Setra, the material should be carefully packaged and shipped prepaid to:
Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719
Attn: Repair Department
To assure prompt handling, please supply the following information and include it inside the package
of returned material:
1. Name and phone number of person to contact.
2. Shipping and billing instructions.
3. Full description of the malfunction.
4. Identify any hazardous material used with product.
NOTES:
Please remove any pressure fittings and plumbing that you have installed and enclose any required
mating electrical connectors and wiring diagrams.
Allow approximately 3 weeks after receipt at Setra for the repair and return of the unit. Non-warranty
repairs will not be made without approval and a purchase order to cover repair charges.
Calibration Services
Setra maintains a complete calibration facility that is traceable to the National Institute of Standards
& Technology (NIST). If you would like to recalibrate or recertify your Setra pressure transducers or
transmitters, please call our Repair Department at 1-800-257-3872 (978-263-1400) for scheduling,
cost and turnaround estimates.
