Setra 278 Data sheet

Model 278

Barometric Pressure Transducer

500 to 1100 hPa/mb; 600 to 1100 hPa/mb; 800 to 1100 hPa/mb

etra’s Model 278 barometric pressure
transducer is designed for use in

S

environmental applications that
require excellent accuracy, fast dynamic
response, and long-term stability and reli­ability.

To withstand the environmental extremes
typically found in Automated Weather
Station (AWS) and environmental monitor­ing applications, the Model 278 housing is
constructed of stainless steel and polyester.
A removable 5-pin terminal strip module is
provided for easy connection to data logger
and signal connections, and a 1/8” Barbed
fitting is used for pressure connection. The
transducer’s footprint (3.6” x 2.4” x 1.0”)
makes it ideal for use as a new or drop-in
replacement to existing configurations.

This unit consumes low levels of power (3mA
nominal) while in operation. Its sleep mode
feature reduces power consumption to 1 µA, and
provides instant startup for applications where
pressure readings must be taken quickly.

Principles of Operation

The Model 278 utilizes Setra’s Setraceram™
capacitive sensor and proprietary custom IC
analog circuit. This fundamentally simple
design and thermally stable glass fused ce­ramic sensing capsule is coupled with Setra’s
sophisticated capacitance charge-balance IC
circuit where accurate signal conditioning and
environmental compensation is performed. The
Setraceram™ sensor provides excellent thermal
expansion coefficient and low mechanical
hysteresis, which contributes to the long-term
stability of the Model 278.

Applications

● Automated Weather
Station (AWS)

● Data Buoys and Ships

● Agricultural Metrology

System

● AWOS/ASOS Systems

● Laser Interferometer

● Wind Tunnel

 High Accuracy Barometric

●

Pressure Measurement

● Data Logger

Benefits

▲ Long-term Stability
Better Than 0.1 mb/yr

▲ Sleep Mode for Instant
Startup (<1 sec.)

▲ Low Power Consumption

▲ Calibration NIST Traceable

▲ Removable Terminal Strip

Module for Easy Wiring

▲ Footprint Configured
for Easy Drop-in Replacement

■ Meets CE Conformance
Standards

Features

■ 0 to 2.5 and 0 to 5 VDC
Output

■ Operating Temperature Range

-40°C to +60°C

■ Wide Operating Voltage

9.5 to 28 VDC

When it comes to a product to
rely on - choose the Model 278.
When it comes to a company to
trust - choose Setra

The Model 278 is operable in temperatures
from -40°C to +60°C (-40°F to +140°F). Us­ers may choose 0 to 2.5 VDC or 0 to 5 VDC
output, a 3 or 4 wire circuit and an excitation
range of 9.5 to 28 VDC.

NOTE: Setra quality standards are based on ANSI-Z540-1.
The calibration of this product is NIST traceable.

159 Swanson Road, Boxborough, MA 01719/Telephone [phone]; Fax: [phone]

IS O-9 00 1 Ce r tifi ed

800-257-3872

Visit Setra Online:

http://www.setra.com

Model 278 Specifications

Performance Data

Pressure Range hPa/mb 500 600 800
Temperature @ Accuracy (hPa/mb)*
20°C (+68°F) ±0.6 ±0.5 ±0.3
0 to 40 °C (+32° to +104°F) ±1.2 ±1.0 ±0.6

-20 to 50°C (-4° to +122°F) ±2.0 ±1.5 ±1

-40 to 60°C (-40° to +140°F) ±2.5 ±2.0 ±1.5
Non-Linearity ±0.5 ±0.4 ±0.25
Hysteresis ±0.06 ±0.05 ±0.03
Non-Repeatability ±0.04 ±0.03 ±0.02

Resolution 0.01 mb
Long Term Stabilty 0.1 mb/Yr
Warm-up <1 sec. from Shut­down Mode (Warm-up
shift <0.1 mb maximum)
Response Time <100mSec
Proof Pressure 1500 hPa
Burst Pressure 2000 hPa

*The root sum squared (RSS) of end point non-linearity, hysteresis, non­repeatability, and calibration uncertainty.
**Units calibrated at nominal 70°F. Maximum thermal error computed
from this datum.

Outline Drawing

Environmental Data

Temperature
Operating -40° to +60°C (-40°F to +140°F)
Storage -60° to +120°C (-76°F to +248°F

Physical Description

Case Stainless Steel and
Polyester
Pressure Fitting 1/8” (ID dia.) Barbed Fitting
Electrical Connection 5-Pin Terminal Block
Dimensions 3.6” x 2.4” x 1.0”
Weight (approx.) 4.8 oz (135g)

Electrical Data

Electrical Circuit 3 or 4 Wire
Excitation** 9.5 to 28 VDC
Output*** 0 to 2.5VDC
0 to 5 VDC
Output Impedance <10 Ohms
Output Noise <50 Microvolts
Current Consumption 3 mA Nominal (Operating Mode)
1 µA (Sleep Mode)

**Internal regulation minimizes effect of excitation variation, with
<0.02 mb output change over 9.5 VDC to 28 VDC range..
*** Zero output saturates at about 20 mV

.

Pressure Media

Non-condensing air or gas.

mm

in.

ORDERING INFORMATION

Example: Part No. 2781600MA1B2BT1 for a 278 Barometric Transducer 600 to 1100 hPa/mbar, Absolute Pressure, 1/8” Barbed Fitting, 0 to 5 VDC Output, 5-pin Terminal Block.

2 7 8 1

Model

2781 - 278

Pressure Range

500M = 500 to 1100 hPa/mb
600M = 600 to 1100 hPa/mb
800M = 800 to 1100 hPa/mb

While we provide assistance on all Setra products,
both personally and through our literature, it is the
customer’s responsibility to determine the suit­ability of the product in the application.

A

Pressure

A = Absolute

1 B

Pressure Conn.

1B = 1/8” Barbed Fitting

Output/Excitation

2Y = 0 to 2.5 VDC/9.5 to 28 VDC
2B = 0 to 5 VDC/9.5 to 28 VDC

159 Swanson Road, Boxborough, MA 01719/Tel: [phone];

Toll Free: 800-257-3872; Fax: [phone]; email: [e-mail]

T 1

Electrical Conn.

T1 = 5-Pin Terminal Block

SSP278 REV B 03/11//11