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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.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A.
A-705-20 LOOP CURRENT METER
Specifications - Installation and Operating Instructions
MODEL NUMBER
A-705-20
RANGE
4-20mA
Phone: 219/879-8000
Fax: 219/872-9057
Bulletin A-30-705
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
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Summary of Contents for Dwyer Instruments A-705-20
- Page 1 4-20mA 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.
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Page 2: Table Of Contents
TABLE OF CONTENTS Common Specification......... . . 3 Installation Mechanical. -
Page 3: Common Specification
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 •... -
Page 4: Installation
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... -
Page 5: Dpm Installation
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). -
Page 6: Calibration
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. -
Page 7: Decimal Point Location 1.Xxx
O (offset) in Counts +199.9 to 57.9 Shorted Open +61.6 to -60.8 Open Open -56.5 to -199.9 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. -
Page 8: Decimal Point Location 1X.xx
DECIMAL POINT LOCATION 1X.XX (JUMPER J1 PIN 8 TO J1 PIN 7 OR 9) “S” In Counts/mA 0 to .57 Shorted Open .52 to .88 Open Open .83 to 1.40 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 Shorted... -
Page 9: Electronic Assembly
DECIMAL POINT LOCATION 1XXX (NO JUMPERS) “S” In Counts/mA 0 to 57 Shorted Open 52 to 88 Open Open 83 to 140 Open Shorted DECIMAL POINT LOCATION 1XXX (NO JUMPERS) O (offset) In Counts +1999 to +579 Shorted Open +616 to -608 Open Open -565 to -1999...
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