Emerson 3051S Dokumentacja Pobierz pdf (Strona 148)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

B-18

Humidity Limits 0–100% relative humidity

Volumetric Displacement Less than 0.005 in

(0,08 cm

)

Damping

(1)

Failure Mode Alarm HART 4-20 mA (output option code A)

If self-diagnostics detect a gross transmitter failure, the analog signal will be

driven offscale to alert the user. Rosemount standard (default), NAMUR, and

custom alarm levels are available (see Alarm Configuration below).

High or low alarm signal is software-selectable or hardware-selectable via the

optional switch (option D1).

Alarm Configuration

Safety-Certified

Transmitter Failure

Values

(2)

PHYSICAL

SPECIFICATIONS

Electrical Connections

/2–14 NPT, G

/2, and M20 × 1.5 conduit. HART interface connections fixed to

terminal block for Output code A and X.

Turn-On Time

(1)

When power is applied to the transmitter during startup,

performance will be within specifications per the time period

described below:

(1) Does not apply to wireless option code X.

Transmitter Turn-On Time (Typical)

3051S, 3051SF_D, 3051S_L 2 seconds

Diagnostics 5 seconds

3051SMV, 3051SF_1-7 5 seconds

Analog output response time to a step change is

user-selectable from 0 to 60 seconds for one time

constant. For 3051SMV, 3051SF_1-7, each variable

can be individually adjusted. Software damping is in

addition to sensor module response time.

(1)

(1) Does not apply to wireless option code X.

High Alarm Low Alarm

Default 21.75 mA 3.75 mA

NAMUR compliant

(1)

(1) Analog output levels are compliant with NAMUR

recommendation NE 43, see option codes C4 or C5.

22.5 mA 3.6 mA

Custom levels

(2)

(2) Low alarm must be 0.1 mA less than low saturation and high

alarm must be 0.1 mA greater than high saturation.

20.2 - 23.0 mA 3.4 - 3.8 mA

Safety accuracy: 2.0%

(1)

Safety response time: 1.5 seconds

(2)

(1) A 2% variation of the transmitter mA output is allowed before a

safety trip. Trip values in the DCS or safety logic solver should be

derated by 2%.

(2) Does not apply to wireless option code X.

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