Dwyer Instruments A-705-20 User manual

Bulletin A-30-705

A-705-20 LOOP CURRENT METER

Specifications - Installation and Operating Instructions

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

UNIT DESCRIPTION

The A-705-20 digital panel meter is a dual range, unipolar, 3 1/2 digit, LCD

current meter. It is powered by the current loop being measured and has

selectable full scale ranges of 4-20mA and 10-50mA. This unit is designed

with a small case size and easy calibration from the right side of the meter.

MODEL NUMBER RANGE

A-705-20 4-20mA

A-30-705 6/22/05 2:43 PM Page 1

TABLE OF CONTENTS

Common Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation

Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Panel Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

DPM Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Connections and Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electrical Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electronic Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 -10

Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

LIST OF TABLES

Decimal Point Location 1.XXX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Decimal Point Location 1X.XX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Decimal Point Location 1XX.X. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Decimal Point Location 1XXX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LIST OF FIGURES

DPM Dimensions & Panel Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

DPM Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Meter rear Pinout Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Headers & Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electronic Assembly (Front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electronic Assembly (Back) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Electronic Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A-30-705 6/22/05 2:43 PM Page 2

SPECIFICATIONS

•Power requirements–– None Required Power is derived from current

source being monitoring with a voltage drop of less than 3.2V(with a

20mA input)

•Range–– ±1999

•Accuracy–– ±0.1% Rdg., ± 1digit

•Settling Time–– Under 1 sec. typical

•Operating Temperature–– 0°C to +50°C

•Storage–– -20°C to +70°C, 72 hrs., -10°C to +60°C, Indefinite.

•Humidity–– 80% RH @ 40°C max., 70% RH @ 50°C max.

•Decimal Points–– set by internal jumper, 1.XXX, 1X.XX, 1XX.X, 1XXX.

•Polarity–– negative count; minus sign at left, positive count, plus sign at

left.

•Tempco–– 100ppm/°C typical

•Weight–– approx. 2 oz.

•Display–– 0.6˝ high LCD

•Recalibration Schedule–– 1 yr. within rated accuracy

•Overrange Indication–– Positive overrange; Negative overrange; -1;

other digits blank.

•Size–– See outline dimensions.

A-30-705 6/22/05 2:43 PM Page 3

Installation

Mechanical Installation

The figure below shows a pictorial view and overall dimensions.

Panel Preparation

Prepare a panel cut-out as shown below at the desired location

A-30-705 6/22/05 2:43 PM Page 4

DPM Installation

•Insert meter in panel cutout from the front.

•From rear, place short side of mounting clips in slots at top and bottom of case. Face

short side of clips to rear.

•Thread the screws into the clips and tighten against panel.

If it is necessary to remove lens, grasp the sides of the meter and press in until lens

bows out. Pull out lens at center.

NOTE: Shorting BC6 will change the function of J-5 to “loop - (50mA)”. This allows the

option of switching the meter between 4-20mA and 10-50mA with a jumper rather than

rewiring the installation see page 10 for reference.

CONNECTIONS AND

CONFIGURATION

Electrical Connections

The model A-705-20 accepts a 10 pin mating connector at the rear for decimal point and

signal inputs. The figure below shows the pinout configuration and the location on the rear

of the meter.

OPERATION

Signal Inputs: apply between pin 2 (Hi) and pin 5 (Lo 20mA) or pin 4 (Lo 50mA).

Decimal Point Selection: activation requires the placement of a jumper from J1 pin

7 to pin 6 from J1 pin 8 to pin 9 (or pin 7), or from J1 pin 10 to pin 9. The factory

setting is for a 20mA meter with selection of 1X.XX. To use other selections,

remove jumper and reinstall on the appropriate pin combination for the decimal

A-30-705 6/22/05 2:43 PM Page 5

CALIBRATION

Allow 5 minutes warm-up with signal of 20mA. The number displayed on the A-705-20

readout is determined by the equation: D = S * I + O where “D” is the count being dis-

played, “S” is a constant scale factor having the dimensions of counts per milliampere, “O”

is a constant scale factor having the dimensions of counts, and “I” is the input current to

the A-705-20.

Example:

Consider the case in which inputs of 4mA and 20mA yield displays of 000 and 100 respec-

tively. Solving the equation for “S” and “O” gives

Where IHis the higher value of current input in milliamperes

ILis the lower value of current input in milliamperes

DHis the display value corresponding to IH

DLis the display value corresponding to IL

Substituting in the equation for “O” gives: “O”= 000 - 6.25 x 4 = -25 counts

The basic equation for the volume displayed is D = 6.25 I - 25.9

After the value for “S” and “O” have found, the A-705-20 can be programmed to respond

in accordance with the basic equation. Programming involves placing two of four internal

jumpers. NOTE: first the decimal point location must be determined. For the example

above, we will choose a decimal point location of 1XX.X. The decimal point location in the

following tables has been adjusted accordingly.

Since “S” in the example (6.25) falls in the range 5.2 to 8.8, both BC1 and BC2 should be

open.

The settings of BC4 and BC5 depend on the value of O and the ranges of O are listed in

the table below.

“S” In Counts/mA

0 to 5.7

6.2 to 8.8

8.3 to 14.0

BC1

Shorted

Open

BC2

Open

Shorted

Scale = Display High - Display Low

Input High - Input Low “S” = 100 - 000

20 -4 = 6.25 counts per mA

S = DH- DL

IH- IL

O = DL- (S • IL)

A-30-705 6/22/05 2:43 PM Page 6

O (offset) in Counts

+199.9 to 57.9

+61.6 to -60.8

-56.5 to -199.9

BC4

Shorted

Open

BC5

Open

Shorted

Since O in the example (-25.0) falls in the range +61.6 to -60.8, both BC4 and BC5 should

be open.

After BC1 , 2, 4, and 5 have been set, the potentiometers R9 and R12 (behind the front

panel) need to be recalibrated for an accurate reading. The procedure is as follows:

1. Connect the positive input lead (current going into the meter) from a current stan-

dard to Pin2 of J1 at the rear of the meter. The negative lead attached to pin 5 of

J1.

2. Short BC3 in the “O” position.

3. Adjust the current standard to approximately ten milliamperes (the value is not crit-

ical for this step).

4. Adjust R9 until the display shows the correct offset value (“O”). (-25.0 in the exam-

ple).

5. Move BC3 jumper to the “S” position.

6. Set the current standard to 10mA.

7. Adjust R12 until the display shows the correct scale factor value X 10. (6.25 X 10

= 62.5 for the example).

8. Remove the BC3 jumper.

9. Verify that the display shows the correct value for 4mA & 20mA inputs (000 &

100.0 respectively for the example).

The following four sets of tables are for the different decimal point location as noted.

“S” In Counts/mA

0 to .057

.052 to .088

.083 to .140

BC1

Shorted

Open

BC2

Open

Shorted

DECIMAL POINT LOCATION 1.XXX (JUMPER J1 PIN 9 TO J1 PIN 10)

O (offset) In Counts

+1.999 to +.579

+.616 to -.608

-.565 to -1.999

BC4

Shorted

Open

BC5

Open

Shorted

DECIMAL POINT LOCATION 1.XXX (JUMPER J1 PIN 9 TO J1 PIN 10)

A-30-705 6/22/05 2:43 PM Page 7

“S” In Counts/mA

0 to .57

.52 to .88

.83 to 1.40

BC1

Shorted

Open

BC2

Open

Shorted

DECIMAL POINT LOCATION 1X.XX (JUMPER J1 PIN 8 TO J1 PIN 7 OR 9)

O (offset) In Counts

+19.99 to +5.79

+.616 to -.608

-5.65 to -19.99

BC4

Shorted

Open

BC5

Open

Shorted

DECIMAL POINT LOCATION 1X.XX (JUMPER J1 PIN 8 TO J1 PIN 7 OR 9)

“S” In Counts/mA

0 to 5.7

5.2 to 8.8

8.3 to 14.0

BC1

Shorted

Open

BC2

Open

Shorted

DECIMAL POINT LOCATION 1XX.X (JUMPER J1 PIN 6 TO J1 PIN 7)

O (offset) In Counts

+199.9 to +57.9

+61.6 to -60.8

-56.5 to -199.9

BC4

Shorted

Open

BC5

Open

Shorted

DECIMAL POINT LOCATION 1XX.X (JUMPER J1 PIN 6 TO J1 PIN 7)

A-30-705 6/22/05 2:43 PM Page 8

“S” In Counts/mA

0 to 57

52 to 88

83 to 140

BC1

Shorted

Open

BC2

Open

Shorted

DECIMAL POINT LOCATION 1XXX (NO JUMPERS)

O (offset) In Counts

+1999 to +579

+616 to -608

-565 to -1999

BC4

Shorted

Open

BC5

Open

Shorted

DECIMAL POINT LOCATION 1XXX (NO JUMPERS)

A-30-705 6/22/05 2:43 PM Page 9

A-30-705 6/22/05 2:43 PM Page 10

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