Setra-system Model 205-2 Instrukcja Użytkownika Pobierz pdf

OPERATING INSTRUCTIONS

MODEL 205-2 PRESSURE TRANSDUCER

FOUR-WIRE, VOLTAGE OUTPUT

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 polyvinyl chloride (cable) or stainless steel, sub-

merged in liquids, subject to spray or drip, or in a high vibration environment. The 205-2 Series is

very slightly sensitive to acceleration in the pressure ﬁtting axis, less than 0.05 psi/g typical. Fac-

tory calibrated in the vertical position, with pressure port downward, this position often minimizes

damage from dripping of pressure system piping.

Installation of pressure ﬁtting:

For very high pressure use of sealant such as Loctite hydraulic sealant is suggested.

For other pressure ranges, standard sealants such as Teﬂon tape generally are satisfactory.

For the most sensitive pressure ranges, excessive high torquing of a metal pressure ﬁtting

may cause a slight zero shift which may be trimmed out using the zero adjustment. Use of

plastic ﬁttings often shows no noticeable zero shift. The torquing effect does not appre-

ciably affect linearity or sensitivity. Use the wrench ﬂats on the 205-2 when attaching to

ﬁttings.

ATMOSPHERIC REFERENCE (Gage pressure transducers only)

Lower range units are subject to excessive thermal zero shift unless vented to atmosphere. The

electrical cable provides this equalization vent.

ELECTRICAL CONNECTIONS:

CABLE LEAD FUNCTION

Red positive excitation

Green positive output

White negative output

Black negative excitation

Shield case

ELECTRICAL

The electrical circuit is equivalent to a 4 terminal network, which can be grounded at only one

point, either at the negative excitation or the negative output lead, but must not be commoned or

grounded at more than one point. The negative output lead is approximately 1.66 VDC above the

negative excitation lead. The positive output lead is at this same 1.66 VDC common mode voltage

plus the output signal from applied pressure (thus goes from approximately 1.66 VDC up to 6.66

VDC above the negative excitation).

The pressure transducer must be operated with the case connected either to the negative

excitation terminal or to the negative output terminal. Failure to do this may result in dam-

age to or unsatisfactory operation of the unit. This connection

may be made by connecting the shield to white or shield to

black leads. Best shielding against noise will be obtained by

connecting the shield and negative excitation (black) leads.

Circuit is reversed voltage protected for at least 5 minutes.

Internal transient suppression network is provided for

short duration transients to 150 volts.

In some instances, use of long cables (sev- er al

hundred feet length) may introduce enough cable capacitance into the

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SSO251REV C 11/8/12 4

Podsumowanie treści

Strona 1

OPERATING INSTRUCTIONSMODEL 205-2 PRESSURE TRANSDUCERFOUR-WIRE, VOLTAGE OUTPUTGENERAL INFORMATIONYour Setra transducer has been carefully calibrated b

Strona 2

INSTALLATION INSTRUCTIONS FOR MULTIPLE HOOK UP OF A 4-WIRE SETRA PRESSURE TRANS-Option #1Uses a single, ground referenced power sup-ply for excitation

Strona 3

RETURNING PRODUCTS FOR REPAIRPlease contact Setra (1-800-257-3872 or 978-263-1400) before returning unit for repair to review infor-mation relative t

Strona 4 - SSO251REV C 11/8/12

159 Swanson Road, Boxborough, MA 01719/1-800-257-3872, (978)263-1400SSO251REV C 11/8/12