Partlow Mrc 7800 User manual

Installation, Wiring, Operation Manual

MRC 7800

ONE AND TWO PEN CIRCLE CHART FLOW RECORDER

QUALITY INSTRUMENTATION DESIGNED & MANUFACTURED IN THE U.S.A.

PAGE 2

nformation in this installation, wiring, and operation

manual is subject to change without notice. One

manual is provided with each instrument at the time of

shipment. Extra copies are available at the price published

on the front cover.

rights reserved. No part of this publication may be repro-

duced, transmitted, transcribed or stored in a retrieval sys-

tem, or translated into any language in any form by any

means without the written permission of the Partlow-West

Company.

This is the Seventh Edition of the MRC 7800 Flow Recorder

manual. It was written and produced entirely on a desk-

top-publishing system. Disk versions are available by writ-

ten request to the Partlow Advertising and Publications

Department.

We are glad you decided to open this manual. It is written

so that you can take full advantage of the features of your

new MRC 7800 Flow Recorder.

PAGE 3

TableofContents

SECTION1-GENERAL PageNumber 1.1

Product Description 5

SECTION2-

INSTALLATION&WIRING

2.1 Installation & Wiring 7

2.2 Unpacking 7

2.3 Location 7

2.4 Mounting 7

2.5 Preparation for Wiring 8

2.6 Wiring Connections 9

SECTION3-GENERALOPERATION

3.1 How the instrument operates 14

SECTION4-

CONFIGURATION&OPERATION

4.1 Configuration Introduction 18

4.2 Shipped Configuration / Jumper Positioning 19

4.3 Operation Summary 19

4.4 Start Up Procedure 20

4.5 Configuration & Operation 21

4.6 Data Logger Display Mode 32

SECTION5-SERVICE

5.1 Service 34

5.2 Changing Charts 34

5.3 Changing Pens 34

5.4 Calibration 35

5.5 Test Mode 37

5.6 Troubleshooting and Diagnostics 40

APPENDICES

A - Board Layouts

A-1 Processor Board 46

A-2A Relay (SPST) Output Board 47

A-2B Relay (SPDT) Output Board 48

A-3 Current Output Board 49

B - Glossary 50

C - Model Number Hardware Matrix Details 52

D - Specifications 53

E - Software Record/Reference Sheet 55

Warranty Inside Back Page

PAGE 4

FIGURES&TABLES

Figure 1-1 Front View 5

Figure 1-2 Display Features 6

Figure 2-1, Panel Dimensions 8

Figure 2-2 Board & Terminal Locations 9

Figure 2-3 AC Power Input 10

Figure 2-4 Volt, millivolt, & milliamp Input 11

Figure 2-5 Transmitter Power Supply Input 11

Figure 2-6 Remote Reset Input 12

Figure 2-7A Relay Output (SPST) 12

Figure 2-7B Relay Output (SPDT) 13

Figure 2-8 SSR Driver Output 13

Figure 2-9 Current Output-Standard 13

Figure 4-1 Keypad Features 19

Figure 5-1 Changing Pens 34

Table 3-1 Variable exponents of Parshall flumes 16

Table 3-2 Totalizer Factor 17

Table 3-3 Totalizer Factor Example 17

Table 4-1 Enable Mode Configuration Procedure 25

Table 4-2 Program Mode Configuration Procedure 26

Table 4-3 Alarm Set Mode Configuraton Procedure 30

Table 4-4 Data logger Setup Mode Configuration 30

Table 4-5 Preset Adjust Mode Configuration 31

Table 4-6 Data logger Display Mode Configuration 33

Table 5-1 Calibration Procedure 35

Table 5-2 Test Procedure and Description 37

PAGE 5

ProductDescription1.1

1.1.1 GENERAL

The instrument is a microprocessor based circular chart recorder capable of measuring,

displaying, recording, and datalogging flow process variables. Three square root extraction

algorithms are available for use with a variety of transmitters and transducers, and four

algorithms are available for use with a variety of weirs and flumes.

Recording functions, alarm settings, and other parameters are easily entered via the front

keypad. All user data can be protected from unauthorized changes by the Enable mode

security system, and is protected against loss from AC power failure by battery back-up.

The process input for each pen is user configurable to directly connect to either mVDC, VDC,

or mADC inputs. Changes in input type are easily accomplished in the field. The unit's

process input is isolated from the rest of the unit. An isolated 24VDC regulated transmitter

power supply can be provided for use with two-wire mADC inputs.

The unit can be ordered for either 115VAC or 230VAC power at 50/60Hz. The 230VAC

option includes a switch for changing back and forth between 230VAC and 115VAC. The unit

is housed in a plastic enclosure suitable for panel or surface mounting.

1.1.2 RECORDING

The unit incorporates a 10 inch circular chart. One box of standard charts is provided with

each unit. Charts are available in a wide selection of ranges. Chart rotation speed is

programmable from 0.1 to 999.9 hours per revolution in 0.1 hour increments. The instrument

can be provided with one or two pens. Pen 1 is red and Pen 2 is green. Pens are of the

disposable fiber-tip type. Changes in pens, as well as charts, are quickly and easily accom-

plished.

A programmable chart/display filter is provided. This filter provides adjustable dampening of

the value displayed and recorded. The filter need not be used. (Configured in program mode

as "dFF," Display Filter Factor.)

FIGURE1-1

Keypad

Scroll Key

Up Key

Down Key

PEN 1 DISPLAY

PEN 2 DISPLAY

Pen 1

Auto/Manual

Key

Pen 2

Auto/Manual

Key

Display

Select Key

PAGE 6

1.1.3 DISPLAYS

Each unit is provided with an eight character digital display and status indicators for each pen

provided. The display provided in the upper right corner is for Pen 1, and the display in the

lower right corner is for Pen 2. Status indication is provided for Alarm 1 and Alarm 2. The

display is programmable for none, one, two or three decimal places for process value and

total, with additional scaling ability for the total. The second display is also optional on one

pen units with totalization for simultaneous display of the process value and total.

1.1.4 ALARMS

Alarm indication is standard on all units. Alarm settings are fully programmable. Alarm type

may be set as Process high or low. Indication is via status LED's provided for each pen.

Alarm outputs can be provided by assigning any specified relays (SPST, SPDT or SSR driver)

to the respective alarm.

1.1.5 PROCESSVALUEOUTPUT

If a unit is specified with 4 to 20 mADC outputs, these outputs may be programmed to

operate as a Process Value Output. As such, the output is scaleable.

FIGURE1-2

TOT

ALRM1 ALRM2

PAGE 7

Installation&Wiring 2.1

CAUTION: TheInstrumentACpowerinput is as specified in the model number; 115VAC or230VAC. VerifytheACpower

inputprovidedwiththeinstrument prior to proceeding with installation.

Read these instructions carefully before proceeding with installation and operation. Electrical

code requirements and safety standards should be observed. Installation should be per-

formed by qualified personnel.

Unpacking 2.2

Remove the unit from the carton and inspect it for any damage due to shipment. If any

damage is noticed due to transit, report and file a claim with the carrier. Write the model

number and serial number of the unit on the inside of the front cover of this Operation Manual

for future reference when corresponding with the factory.

Location 2.3

Locate the instrument away from excessive moisture, oil, dust, and vibration. Do not subject

the instrument to operating temperatures outside of 0 to 55° C.

Mounting 2.4

Figure 2-1 (page 8) shows installation view and physical dimensions for a panel mounted

unit.

The panel that the unit will be mounted in must provide rigid support for the approximately 20

pound unit . Adjacent units may be mounted within a minimum of 2 inches horizontally and 3

inches vertically, providing that proper panel support is supplied.

PANEL MOUNTING HARDWARE REQUIRED: (not provided with instrument)

(4) 9/32" x 2" bolts w/nuts

(4) appropriate lockwashers

PANEL MOUNTING:

1) Cut panel hole to dimensions shown in Figure 2-1 (page 8).

2) If the rear of the panel is accessible for wiring after mounting, place the unit in the

panel cutout and fasten it to the panel through mounting holes supplied in the case

flange.

3) If the rear of the panel is not accessible for wiring, proceed with wiring preparation and

wiring, then mount the unit.

SURFACE MOUNTING:

1) If surface mounting is required, use Kit # 64402001 (ordered separately) Install mounting

brackets on sides of case and mount on the mounting surface.

PAGE 8

FIGURE2-1

PreparationforWiring 2.5

2.5.1 WIRINGGUIDELINES

Electrical noise is a phenomenon of the typical industrial environment. The following are

guidelines that must be followed to minimize the effect of noise upon any instrumentation.

2.5.1.1 INSTALLATION

Listed below are some of the common sources of electrical noise in the industrial environ-

ment:

* Ignition Transformers

* Arc Welders

* Mechanical contact relays

* Solenoids

* Motors

Before using any instrument with devices listed previously, the instructions below should be

followed:

1. If the unit is to be mounted in the same panel as any of the listed devices, separate them

by the largest distance possible. For maximum electrical noise reduction, the noise

generating devices should be mounted in a separate enclosure.

2. If possible, eliminate mechanical contact relays and replace them with solid state relays. If

a mechanical relay being powered by the unit's output device cannot be replaced, you may

wish to use a solid state relay to isolate the instrument from this source of noise.

3. A separate isolation transformer which feeds only instrumentation should be considered. If

available, it can isolate many noise sources from the AC power input of the unit.

4. If the unit is being installed in an existing installation, a review of the wiring in the existing

area should be done.

12 5/8

7 1/2

13 1/2

(342.5 mm )

13 15/16

(354 mm)

(5.5 mm)

9/32

DIA.(7.1mm)

15 1/8

(384.2

mm).

(64 mm)

WIDTH OF COVER

4 11/16

(119.1 mm)

13 3/16

(335 mm)

Mounting

Bracket (2)

2 19/32

(65.9mm)

EC1

EC2

EC3

EC4

(320.7

mm) (190.5

mm)

7/32

3 3/4

(92.3 mm)

PAGE 9

2.5.1.2 AC POWER WIRING

Earth Ground

Each unit includes noise suppression components attached to the chassis that require an

earth ground connection. To verify that it is earth ground being attached, make a resistance

check from instrument chassis to the nearest metal water pipe or proven earth ground. This

reading should not exceed 100 ohms.

Neutral (For 115 VAC)

It is good practice to assure that the AC neutral is at or near ground potential. To verify this, a

voltmeter check between neutral and ground should be done. On the AC range, the reading

should not be more than 50 millivolts. If it is greater than this amount, the secondary of this

AC transformer supplying the instrument should be checked by an electrician. A proper

neutral will help ensure maximum performance from the instrument.

2.5.1.3 WIRE ISOLATION

The instrument is designed to promote proper separation of the wiring groups that connect to

the instrument. The AC power wire terminals are located near the top of the instrument

boards. The analog signal terminals are located near the bottom of the intrument boards.

Maintain this separation of the wires to insure the best protection from electrical noise. If the

wires need to be run parallel with any of the other lines, maintain a minimum 6 inch space

between the wires. If wires must cross each other, do so at 90 degrees. This will minimize the

contact with each other and reduces "cross talk". "Cross talk" is due to the EMF (Electro

Magnetic Flux) emitted by a wire as current passes through it. This EMF can be picked up by

other wires running in the same bundle or conduit.

2.5.1.4 USE OF SHIELDED CABLE

Shielded cable helps eliminate pickup of noise the wires may be exposed to. Shielded cable

is a single or multi-pair of insulated wires with each wire or pair of wires surrounded by a wire

mesh or conductive foil and then covered with plastic insulation.

It is recommended that all analog signals be run with shielded cable. Connection lead length

should be kept as short as possible, thus keeping wires protected by the shielding. The shield

should be grounded at one end only, at the transmitter or transducer and the shield should be

stripped back before going inside the unit case .

WiringConnections2.6

All wiring connections are typically made to the unit with it installed. Connections should be

made at the terminal blocks, two 12 gauge wires maximum, using copper conductors only.

Terminal blocks are designated TB1 thru TB13. See Figure 2-2 for the terminal block

locations.

FIGURE2-2

TB3 TB4 TB5

TB1

1 2 1 2 3 4 5 1 2 3 4

1 2 3 4 1 2 3 4 1 2 3

TB6 TB7 TB8

TB9

1 2 3 4

RELAY/SSR Driver

Board

TB10 TB11 TB12 TB13

1 2 1 2 1 2 1

Current Output Board

Processor Board

TB 2

1 2

PAGE 10

2.6.1 ELECTRICALCONDUITOPENINGS

The instrument case will have 3 or 4 conduit openings, depending upon the number of outputs

specified. To help minimize electrical noise that may adversely affect the operation of the

instrument, the wires indicated below should be routed through the conduit opening specified.

See Figure 2-1 (page 8) for conduit opening locations.

EC1 - AC power

EC2 - Analog input and mAdc outputs

EC3 - SPST, SPDT relay or SSR driver outputs

EC4 - SPST, SPDT relay or SSR driver outputs

(provided when > 4 relays & SSR's are specified)

Unused conduit openings should be sealed if exposed to the environment.

2.6.2 ACPOWERWIRINGCONNECTIONS

WARNING: ToavoidelectricalshockAC power wiring must not be

connectedatthesourcedistribution panel until all wiring connections are completed.

FIGURE2-3

AC Instrument Power Input

Connect the 115 VAC hot and neutral to terminals 1 and 2 respectively of TB1. See Figure 2-

2 (page 9) for Terminal Board locations on the instrument. Connect the 230 VAC one leg to

each terminal, be sure to check the position of the Voltage Selector switch provided with 230

VAC instruments. The switch position must match the voltage input to the instrument.

TB1

Connect the AC

ground at the

green ground screw

on the left side of

the inside of the

case

Line 1 Line 2

PAGE 11

FIGURE2-4

Volt, Millivolt and milliamp Input

Make the volt, millivolt or milliamp conections as shown below. Use TB4 for Pen 1 and TB5

for Pen 2. Terminal 1 is positive and terminal 2 is negative. Be sure that input conditioning

jumpers are in the correct positions for the input being connected. See Appendix A-1 (page

46).

FIGURE2-5

Transmitter Power Supply

If the isolated 24 VDC regulated transmitter power supply has been specified, the connections

should be made as shown. Connections are made using TB3, terminal 1 is positive and

terminal 2 is negative. The power supply is capable of providing the power needed by up to 2

transmitters.

12345

TB4 or TB5

SHIELDED

TWISTED

PAIR

SOURCE

MAY BE

GROUNDED

UNGROUNDED

SHIELDED

TWISTED

PAIRS

12345

TB4 or TB5

TB3

12345

TB4

TB3

12345

TB5

TWO WIRE

TRANSMITTERS

TWO WIRE

TRANSMITTERS

TWO WIRE

TRANSMITTERS

NOTE: Fault Detection

Not Functional for 0-5V

Input.

PAGE 12

FIGURE2-6

Remote Reset Input

Make connections as shown. Use TB4 for Pen 1 and TB5 for Pen 2. Terminal 3 is ground

and terminal 4 is the input.

2.6.3 OUTPUTCONNECTIONS

Relay outputs, if provided in the instrument, may be assigned to alarm, preset, or pulsed

output functions for Pen 1 and/or Pen 2 (if present). Current outputs may be assigned to

process value retransmission output for Pen 1 and/or Pen 2 (if present). The assignment of

the output function is accomplished in the Program mode, see Section 4.5.3 (page 22).

SPST relay and/or SSR driver output(s) is/are designated as Relay A through Relay H. SPST

relays begin with Relay A designation, then B, C, etc. SSR drivers begin with Relay H

designation, then G, F, etc.

FIGURE2-7A

Relay Output (SPST)

Connections are made to relays A through F as shown. Terminal connections are made

using TB6 (Relay/SSR Driver A, B), TB7 (Relay/SSR Driver C,D), and TB8 (Relay/SSR Driver

E, F).

TB4 or TB5

1 2 3 4

SHIELDED

TWISTED

PAIR

REMOTE

DRY

CONTACT

1234

LOAD

POWER

HOT

TB6 OR TB7 OR TB8

NEU

5 AMPERES

MAXIMUM

AT 115 VAC

PAGE 13

FIGURE2-7B

Relay Output (SPDT)

FIGURE2-8

SSR Driver Output

Connections are made to relays H through A as shown. Terminal connections are made

using TB9, TB8, etc. depending on the number of SSR Driver outputs specified.

FIGURE2-9

Current Output

Connections are made to standard current outputs A through D as shown. Each current

output is programmable as either 4 to 20mADC or 0 to 20mADC. Each output must be

assigned to the desired function (refer to Table 4-2, page 26, for details). Terminal connec-

tions are made using TB10 through TB13 for current output A through D respectively. Con-

nect positive lead (+) to terminal 1 and the negative lead (-) to terminal 2. Current outputs will

operate up to 650 ohms maximum load.

123

LOAD

POWER

HOT

TB6 OR TB

NEU

5 AMPERES

MAXIMUM

AT 115 VAC

N.O C N.C

1234

SSR

TB6 THRU TB9

SOLID STATE RELAY

1 2

SHIELDED

TWISTED

PAIR

LOAD

650 OHMS

MAXIMUM

PAGE 14

HowTheInstrumentOperates 3.1

3.1.1 OFFMODE

In the Off mode, the instrument alarm and preset function(s) is/are turned off, pulsed output(s)

are inactive and process retransmission signal(s) remain(s) active. The chart rotation can be

selected in the Program mode to stop or continue to rotate when the instrument is in the Off

mode. The pen remains active. The totalization function is inactive, but datalogging functions

continue.

The Off mode is entered by pressing and releasing the SCROLL key until the display reads

oFF, then pressing the DOWN key. If the instrument was displaying process value, the

display will read oFF, then the current process variable at two second intervals. If the

instrument was displaying total, the display will read oFF, then the total at two second

intervals. Entering the Off mode of a dual pen instrument will cause both pens to enter the Off

mode. The second pen display will be blank as the upper display reads oFF and displays the

value for the second pen at the same time as the upper display.

To exit the Off mode, depress the SCROLL key to proceed to any other mode, pressing the

DOWN key to enter that mode.

3.1.2 OPERATEMODE

In the Operate mode, the instrument alarm function(s), the preset function(s), the pulsed

output(s) and the process retransmission signal(s) are actively responding to the process

variable as selected in the Program, Alarm Set and Preset modes and the chart will be

rotating at the rate selected. The totalization function is active, as is the datalogging function.

3.1.2.1 TOTALIZATION

Totalization can be implemented on instruments provided with the totalization feature.

Totalization can be programmed on or off for each pen.

To initiate totalization, depress the SCROLL key until oPEr is displayed, then depress the

DOWN key.

To view the total, depress the DISPLAY SELECT key once with the PV value displayed. The

TOT light should be lit and the total for Pen 1 in the upper display and the total for Pen 2 in the

lower display.

Instruments with Totalization and second display will have the total displayed in the lower

display whenever the upper display is set to PV.

On two pen units only, a Combined Total is available. When activated in the Program mode

an additional step is added to the display choice sequence provided by the Display Select

Key.

If the totals are displayed and the DISPLAY SELECT key is depressed, the Combined Flow

Rate will appear in the top display with a C in the leftmost digit and the Combined Total will

appear in the bottom display. The PV and TOT indicators will be lit, respectively.

Note: When Combined Total is being used, it is required that the decimal position,

dPoS, and totalizer decimal position, tdP, in the Program mode, for both pens are the

same. When the totalizer for Pen 1 is reset, the combined total is also reset.

Upon sensor break, the Combined Total will increment at a indeterminate rate.

PAGE 15

3.1.2.2 PULSED OUTPUTS

Pulsed output(s), one for each pen, can be implemented on instruments provided with the

totalization feature and a relay that is not assigned to any other function.

Pulsed output is selected in the Program mode. With a pulsed output select (PoS) equal to 1,

each time the Totalizer Display is incremented, the relay that is assigned, in the Program

mode, as a pulsed output will close for a duration of 50 milliseconds or 60 milliseconds based

on a 60 Hz or 50 Hz line frequency, respectively.

On two pen instruments, a Combined Pulse Output is available. This feature provides a

pulsed output as the Combined Total increases.

Note: Upon sensor break, the Combined Pulse Output will increment at a indetermi-

nate rate.

3.1.2.3 PROCESS VALUE RETRANSMISSION

Process value retransmission can be implemented on instruments provided with at least one 4

to 20mA output.

Process value retransmission is selected in the Program mode. When selected, a current

output must be assigned and the process output must be scaled.

On two pen instruments, a Combined Flow Rate is available. When selected in the Program

mode, this feature provides a process value retransmission value equal to the combined flow

rate. The value is scaled using Pen 1 process output upper and lower parameters.

3.1.2.4 DATA LOGGING

Data logging can be implemented on instruments provided with the data logging feature, and

it will store data for up to 28 days.

Each day, at the time specified by ttLd (time to log data), the following data will be logged:

date, minimum rate, its time, maximum rate, its time, daily total, and average rate. The daily

total is derived by substracting "yesterday's total" from the current total. The average rate is

derived from the daily total, taking into account the flow time base. After the data is logged,

"yesterday's total" will be set to the current total, and the minimum and maximum rates and

times are set to the current rate and time.

Logged data is accessed via a day number, with 1 through 7 corresponding to the current

week. At the beginning of each week (00:01 on day 1 - each Monday) the data is shifted

down one week, with the oldest weeks worth of data being discarded. All data for the current

week is zeroed, including the date for each day.

3.1.2.5 ENGINEERING UNITS PROCESSING ALGORITHM

In the Program mode, the parameter EuPA, Engineering Units Processing Algorithm specifies

how the engineering unit inputs are handled. This allows selection of the various algorithms

to convert the raw input in to the desired process value.

LINEAR CONVERSION - EuPA = 0

For those sensors/transmitters that provide an output directly proportional to flow, or other

applications where the instrument may be used with a linear input to output transformation.

SQUARE ROOT EXTRACTION - EuPA = 1

The square root extraction function applies to rate of flow measurments using differential

pressure sensors. Differential pressure transmitters typically generate a 4-20mADC signal

that represents differential pressure, not flow. The flow is a function of the square root of the

differential pressure.

2 STAGE SQUARE ROOT EXTRACTION - EuPA = 2

This approach is used to minimize the process value below a 4% input, since it is less

meaningful due to inaccuracy and repeatability problems. Below 4% a linear function is

applied.

(Continued on next page)

PAGE 16

3 STAGE SQUARE ROOT EXTRACTION - EuPA = 3

This approach is used to further minimize the process value below a 1% input, since it is even

less meaningful. Below 1% a low gain linear function is applied. Between 1% and 2.5% a

higher gain linear function is applied. Above 2.5% the square root function applies, as the

sensor begins to provide a reasonably accurate and repeatable output. Refer to the glossary

(page 53).

VARIABLE EXPONENT - EuPA = 4

Open channel flow is used in wastewater and other applications. For rectangular weirs, the

flow is proportional to the height/head to the 3/2 power. For triangular (or V notch) weirs, the

flow is proportional to the height/head to the 5/2 power. For Parshall flumes, the flow is

proportional to the height/head to approximately the 3/2 power. See Table 3-1. When

variable exponent is selected in the Program mode, Engineering Units Exponent, EuE, must

be set for the correct exponent value.

TABLE3-1

The exponent for a number of common Parshall flumes are as follows:

1 - inch = 1.55

2 - inch = 1.55

3 - inch = 1.547

6 - inch = 1.58

9 - inch = 1.53

1 to 8 ft = 1.522w raised to the .023 power

10 to 50 ft = 1.6

w = throat width in feet

PIECEWISE LINEAR - EuPA = 5

For some applications, the relationship between the input and process value cannot be

specified by one of the available algorithms. For these instances, the relationship can be

approximated by a straight line relationship over portions of the span. Provided enough

pieces, this method will provide the required accuracy. When piecewise linear is selected, the

second set of Engineering Units parameters, Euu2 and EuL2 must be used to specify the

span of the input, and then iu1, iu2....iu20 and Pu1, Pu2.....Pu20 are the input and process

values for the respective points, in engineering units.

VARIABLE EXPONENT WITH CORRECTION - EuPA = 6

For some applications, the relationship between the input and process value can be basically

characterized as exponential, but not to within the accuracy desired. Use of the Piecewise

Linear algorithm may require a large number of points to provide the desired accuracy. By

using the piecewise linear method to provide a correction to the simple exponential, a high

degree of accuracy can be achieved. This is especially applicable to open channel flow using

Palmer-Bowlus flumes or H flumes. Consult factory for assitance, if needed, when using

variable exponent with correction.

SATURATED STEAM FLOW WITH PRESSURE CORRECTION - EuPA = 7

Only available with a 2 Pen unit. For saturated steam flow, accurate flow measurement is

dependent on pressure correction. By using the second pen to input and record pressure, the

pressure data is available to correct the flow value. The input is typically gauge pressure,

which is converted to absolute pressure by the instrument. Since the pressure may be in the

60 PSIG range, barometric pressure or elevation can induce an error. Therefore, the baro-

metric pressure, bAro, needs to be set in the Alarm Set mode. If the input is absolute

pressure, bAro must be set ot zero.

PAGE 17

3.1.2.6. TOTALIZER FACTOR

Scaling of the displayed total is possible, with the use of totalizer factor, tFAC. When used,

the displayed value is multiplied by a factor to obtain the actual total. See Table 3-2.

TABLE3-2

tFAC = 0 Actual Total = Displayed Total Times 1

tFAC = -1 Actual Total = Displayed Total Times 10

tFAC = -2 Actual Total = Displayed Total Times 100

tFAC = -3 Actual Total = Displayed Total Times 1000

tFAC = -4 Actual Total = Displayed Total Times 10000

tFAC = 1 Actual Total = Displayed Total Times 0.1

tFAC = 2 Actual Total = Displayed Total Times 0.01

tFAC = 3 Actual Total = Displayed Total Times 0.001

Example

An application is measuring flow at a maximum rate of 6000 gallons per minute (6000 gpm).

The steady flow rate is 2000 gallons per minute (2000 pgm). Table 3-3 shows how, with

various settings in the Program mode, the process variable displayed and the total displayed

can be configured.

TABLE3-3

6000 gpm, flow rate 2000 gpm