WATANABE ELECTRIC INDUSTRY CO., LTD AL-512 SERIES Instruction Manual

(1)The application of voltage or current exceeding its maximum

allowable value to the input terminals may result in instrument
damage.

(2)The supply of power out of its allowable range may cause fire,

electric shock or instrument failure.

(3)The content of this manual may subject to change without prior

notice for product improvement.

(4)This manual is carefully prepared. However, if any question

arises, or any mistake, omission or suggestion is found in the
content of this manual, contact your nearest our sales agent.

2.3. Terminals

2.4. Connection examples

1.Outline

The Model AL-512 digital panel meter is a process monitor which
has an extremely thin 3-1/2 digit LED display unit and also does
not require a power supply (driven by a 4 to 20mA signal).
It is provided with the display having a maximum of 1999 and the
scaling function by which the input signal can be converted to any
process variable for its display. In addition, wiring can be easily
conducted by the use of a screw terminal board.

2.Before operation

2.1. Accessory check
The following accessories are attached to one Model AL-512 digital
panel meter.

Instruction manual One copy
Screw terminal cover 1 pc.
If any question may arise on these accessories, please contact your

nearest Watanabe sales agent or Watanabe directly

2.2. Mounting

2.2.1. Panel cutout dimensions

Prior to mounting the meter, make the cutout through the panel as

shown in the following figure.

Panel cutout dimensions

2.2.2. Mounting

For mounting the meter, insert it in the panel cutout from the front

of the panel while pushing the hooks on both sides of the case in
the case. (See the following figure.)

Mounting diagram

*The Model AL-512 meter produces a voltage drop of about 5.3V

(at an input of 20mA).

For this reason, conduct wiring in consideration of the impedance
in the entire circuit.

*If this meter is used at a noisy location, ground the E (earth)

terminal.

3. Functions

3.1. Scaling adjustment
First, remove the front panel of this meter by referring to the
following figure. Then, turn the Offset adjuster (see the following
figure) until the desired value is displayed (setting range: ±

200) with an input signal of 4mA applied to the input terminals
on the meter.

Next, turn the Fullscale adjuster (see the following figure) until
the desired value is displayed (setting range: 100 to 1999) with an
input signal of 20mA applied to the input terminals.

*Prior to conducting scaling adjustment, allow more than 20 minutes

for the meter to warm up.

INSTRUCTION MANUAL

DIGITAL PANEL METER

Caution

MODEL AL-512 SERIES

WATANABE ELECTRIC INDUSTRY CO., LTD.

3.2 Decimal point setting
Prior to factory shipment, the decimal point of this meter is so

set that its position corresponding to the 101 digit is lit, change
the position of the decimal point by referring to the following
figure.

4. Calibration

In order to calibrate the meter, a current generator with an accuracy

of ±0.01% or more is required. This calibration is conducted in
the same manner as 3.1 Scaling adjustment.

5. Specifications

Model

Measuring

range

Display

Max. allowable

input current

AL-512

4 to 20mA DC

Offset;±200

Fullscale;

100 to 1999

±50mA

Accuracy: ±(0.1% of FS +1 digit)(23℃±5℃ and 35 to 85% RH)

Measurement function

： Measurement of instrumentation

signal(4 to 20mA DC)

Operation

：Double integral type

Maximum display

：1999

Sampling speed

：2.5 times／sec.(TYP)

Noise rejection ratio

：NMR 40dB (TYP)

Temperature
characteristics

：Offset displayed-value:
±0.3 digit/℃

Fullscale displayed-value:
±0.3 digit/℃

Overrange warning

：For an input of more than 1999, “1”

is displayed in the most
significant digit and the lower 3
digits go out.

Variable span of
fullscale

：100 to 1999

Variable span of
offset

：±200

Voltage drop

：5V at an input of 4mA(TYP)

5.3V at an input of 20mA(TYP)

Display

：7-segment LEDs (Red light emitting

diode numeric elements)

Character height, 14.2mm

Polarity display

：”-“ is automatically displayed

when the computation result is
minus.

External control

：None

Operating temperature
/humidity range

：0 to 50℃/ 35 to 85%RH

Power supply

：None (Driven by input signal)

Dielectric strength

：Between input terminal (LO) and E

terminal; For 1 min. at 500V DC

Dimensions

：96(W)×48(H)×22(D)mm

Weight

：Approx 55g

Accessory

：Screw terminal cover 1 pc.

Instruction manual 1 copy

Conformity standard

：EN61326-1: 2006

6. Dimensions

7. Warranty and After Sales Service

7.1 Warranty
The warranty lasts for one year from the date of delivery. If this
product fails during this period and the reason is considered to
be clearly.
The manufacturer warrants to the original retail customer its
indicator to be free of defects in material and workmanship for
use under normal care and will repair or replace any

7.2 After Sales Service
Under strict quality control measures, this product was
manufactured, tested, inspected and shipped. Should a defect in
manufacture or Workmanship be identified, please return the
product to our distributor or directly to us. It would be highly
appreciated if you could give a detailed account of the fault and
enclose it with the product.

Model AL-512 Series ED-49982c

WATANABE ELECTRIC INDUSTRY CO., LTD.

6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]

Homepage http://en.watanabe-electric.co.jp/

ASAHI KEIKI DIVISION

WATANABE ELECTRIC INDUSTRY CO., LTD.

6-16-19, Jingumae, Shibuya-ku, Tokyo 150-0001, Japan
Phone: [phone]

Homepage http://www.watanabe-electric.co.jp/en/