Rosemount 1151 Manuale utente

LCD Meter

Product Manual

Right Configuration ButtonLeft Configuration Button

Analog

Bar Graph

00809-0100-4691

English

Rev. AA

INTRODUCTION

The Rosemount®LCD meter is designed to be used

with the Rosemount Model 1151 Smart and Analog Pressure

Transmitters, the Model 1144 Pressure Transmitter, the

Model 751 Field Signal Indicator, the Model 444 Temperature

Transmitter, and the Model 1135 Pressure-to-Current Converter.

The LCD meter plugs directly into these instruments to provide

an accurate digital display of the process variable. This manual

explains the configuration and assembly of the LCD meter and

includes applicable functional, performance, and physical

specifications.

This meter adds no voltage drop in the 4–20 mA current loop

when connected directly across the transmitter test terminals.

When used in the Model 751 Remote Signal Indicator, the meter

plugs into terminals 1 and 2.

LCD METER ASSEMBLY

Figure 1 shows the mounting hardware required to properly

install the LCD meter on a transmitter or in the field signal

indicator. This mounting hardware may also be used with the

Rosemount universal (analog) meter.

LCD METER CONFIGURATION

The LCD meter may be configured to meet specific

requirements by using the left and right configuration buttons

located on the meter face as shown on the cover. The analog bar

graph is also shown on the cover. The 20-segment bar graph is

factory calibrated and represents 4–20 mA directly.

No calibration equipment is required to configure the LCD

meter, but between 4 and 20 mA must be flowing through the

loop. The actual value of the current is not significant. In addition,

meter configuration does not affect the transmitter/loop current.

Use the following meter configuration procedure to properly

configure the LCD meter.

NOTE

The LCD meter time-out is approximately 16 seconds. If keys are

not pressed within this period, the indicator reverts to reading the

current signal.

Remove the cover

1. Unscrew the retaining ring shown onthe cover and lift the

transparent cover off of the housing.

Position the decimal point and select the meter function

2. Press the left and right configuration buttons

simultaneously and release them immediately.

3. To move the decimal point to the desired location, press

the left configuration button. Note that the decimal point

wraps around.

4. To scroll through the mode options, press the right

configuration button repeatedly until the desired mode

is displayed. See Table 1.

Store the information

5. Press both configuration buttons simultaneously for two

seconds. Note that the meter displays “----” for

approximately 7.5 seconds while the information is being

stored.

Set the display equivalent to a 4 mA signal

6. Press the left button for two seconds.

7. To decrease the display numbers, press the left

configuration button and to increase the numbers,

press the right configuration button. Set the numbers

between –999 and 1000.

8. To store the information, press both configuration buttons

simultaneously for two seconds. Note that the meter

displays “----” for approximately 7.5 seconds while the

information is being stored.

Set the display equivalent to a 20 mA signal

9. Press the right button for two seconds.

10. To decrease the display numbers, press the left

configuration button on the display and to increase the

numbers, press the right configuration button. Set the

numbers between –999 and 9999. The sum of the 4 mA

point and the span must not exceed 9999.

11. To store the information, press both configuration buttons

simultaneously for two seconds. Note that the meter

displays “----” for approximately 7.5 seconds while the

information is being stored. The LCD meter is now

configured.

Replace the cover

12. Make sure the rubber gasket is seated properly, replace

the transparent cover, and replace the retaining ring

.TABLE 1. LCD Meter Modes.

Options Relationship between Input Signal

and Digital Display

L in

L inF

Srt

SrtF

Linear

Linear with five-second filter

Square root

Square root with five-second filter

Square root function only relates to the digital display.

The bar graph output remains linear with the current signal.

Square root response

The digital display is proportional to the square root of the input

current where 4 mA = 0 and 20 mA = 1.0, scaled per the

calibration procedure. The transition point from linear to square

root is at 25% of full scale flow.

Filter response operates upon “present input” and “input

received in the previous five second interval” in the following

manner:

Display = (0.75 3previous input) + (0.25 3present input).

This relationship is maintained provided that the previous

reading minus the present reading is less than 25% of full scale.

LCD METER SPECIFICATIONS

Input Signal

4–20 mA dc.

Meter Indication

4-digit LCD showing –999 to 9999. A 20-segment bar graph

directly represents the 4–20 mA current.

Digital Display Resolution

0.05% of range ±1 digit.

Analog Bar Graph Resolution

1 mA or 5% of input range.

Indication Accuracy

0.25% of range ±1 digit.

Scaling/Configuration

4 mA Point Limits: –999 to 1000.

Span limits: 0200 to 9999.

The sum of the 4 mA point and span must not exceed 9999.

Adjustments are made using non-interactive zero and span

buttons.

Temperature Limits

Storage: –40 to 85 °C (–40 to 185 °F).

Operating: –20 to 70 °C (–4 to 158 °F).

Between temperatures –40 to –20 °C (–40 to –4 °F),

the loop is intact and the meter is not damaged.

Temperature Effect

0.01% of range per °C on zero.

0.02% of range per °C on span

Stability

Over Time: 0.1% of range ±1 digit for 6 months.

Overload Limitation

666 mA.

Update Period

750 ms.

Response Time

Responds to changes in input within a maximum of two update

periods. If the filter is activated, then the display responds to the

change within nine update periods.

Humidity Limitation

0 to 95% non-condensing relative humidity.

Power Interrupt

All configuration and calibration constantsare stored in EEPROM

memory and are not affected by power loss.

Failure Mode

LCD meter failure will not affect transmitter operation.

Under/Over Range Indication

Input current < 3.5 mA: Display blank.

Input current > 22.0 mA: Display flashes 112.5% of full scale

value or 9999, whichever is less.

Hazardous Locations

Approved for use with Rosemount Models 444, 751, 1135, 1144,

and 1151.

Meter Size

21/4-inch diameter face with 1/2-inch high characters.

Rosemount Inc.

8200 Market Boulevard

Chanhassen, MN 55317 USA

Tel 1-800-999-9307

Telex 4310012

Fax (612) 949-7001

http://www.rosemount.com

¢00809-0100-4691S¤

00809-0100-4691, Rev. AA

Mounting Screw into

Mounting Plate

Mounting Screw

into Housing

Strap Washer

Retaining Straps

Mounting Screws

Terminal Screws

(Mount into Transmitter

“Test” Terminal Block)

Mounting Plate

Meter (Meter May Be

Rotated in 90° Increments)

Cover Bushing

Cover Foam Spacer

FIGURE 1. LCD Meter Exploded View.

751-0264B

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