WATANABE ELECTRIC INDUSTRY AM-212 Series User manual

■Meaning of warning mark
■Caution marks
(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.
(5)Make this manual available easily anytime.
1.Outline
The AP-212 digital meter relay is a scaling meter with the 2-step
setting analog comparator function. It is provided with the
output of 2-stage relays and analog signal as the standard
specification. It has case dimensions of 48mm×24mm conforming
to DIN Standard and is driven by a power supply voltage of 24V
DC.
Its display uses 7-segment LEDs with a character height of 8mm
with a maximum display of 1999.
２.Specifications
■Instrumentation signal input
(DC voltage measurement)
Accuracy：±(0.1% of rdg +2digit)(23℃±5℃、35 to 85%RH)
■Instrumentation signal input
(DC current measurement)
Accuracy：±(0.1% of rdg +2digit)(23℃±5℃、35 to 85%RH)
■DC voltage measurement
Accuracy：±(0.1% of rdg +2digit)(23℃±5℃、35 to 85%RH)
■DC current measurement
Accuracy：±(0.2% of rdg +2digit)(23℃±5℃、35 to 85%RH)
However, only for the AM-212-25: ±(0.3% of rdg +1digit)
*In the internal resistance column: Externally mounted.
■Model No. configuration
Example:
Model/Range
code
Measuring
range
Display
Input
impedance
Max. allowable
input voltage
AM-212-1V
1 to 5V
Offset ±1000
Fullscale
100 to 1999
Approx.1MΩ
±250V
Model/Range
code
Measuring
range
Display
Input
resistance
Max.
allowable
input current
AM-212-2A
4 to 20mA
Offset ±1000
Fullscale
100 to 1999
51Ω
±70mA
Model/Range
code
Measuring
range
Display
Input
impedance
Max. allowable
input voltage
AM-212-11
±199.9mV
Offset ±1000
Fullscale
±100 to 1999
100MΩ
±100V
AM-212-12
±1.999V
10MΩ
±250V
AM-212-13
±19.99V
10MΩ
±250V
AM-212-14
±199.9V
10MΩ
±500V
Model/Range
code
Measuring
range
Display
Input
resistance
Max. allowable
input current
AM-212-21
±199.9μA
Offset ±1000
Fullscale
±100 to 1999
1kΩ
±10mA
AM-212-22
±1.999mA
100Ω
±50mA
AM-212-23
±19.99mA
10Ω
±150mA
AM-212-24
±199.9mA
※1Ω
±500mA
AM-212-25
±1.999A
※0.1Ω
±3A
DIGITAL METER RELAY
INSTRUCTION MANUAL
MODEL AM-212 SERIES
Precautions
This mark indicates that if the meter is
operated incorrectly, death or serious
injury may result.
WARNING
Do not disassemble the meter or touch the components
and parts inside the meter with the power turned on
or input connected.
CAUTION
The mark on the label indicates the measuring range
in Item 2. Specifications.
Caution required when the AM-212 is used on equipment conforming
to EN/IEC Standards!
For the AM-212 with an input signal of more than 70VDC, connect its
HOLD and ANALOG out terminals to the equipments whose foundation
is isolated.
WATANABE ELECTRIC INDUSTRY CO., LTD.

３.General specifications
■Measurement block
■Comparison block specifications
■Common specifications
４．Mounting
4-1 Mounting
1)Mounting the meter on mounting panel
Drill the hole as shown in Fig.1 through the mounting panel, then
insert the meter into the mounting panel through the hole from
the front.
Recommended panel thickness: 0.8 to 3.5mm
4-2 Connector connection
1)Power supply connection
Connect the power supply between the zno.9 (0V) and No.10 (+24V)
terminals on the lower connector. Use the meter at a power supply
voltage of 24V DC+20%. (As this meter is not provided with a power
supply switch, the meter is ready to operate just when the power
is turned on.)
2)Connect the input signal between the HI (No.1) and LO (No.2)
terminals on the upper connector.
Measurement function
：Specify one Model from among DC voltage
and current measurement Model Nos.
Operation type
：Double integral
Input circuit
：Single-ended
Input bias current
：2nA(TYP)
Sampling speed
：2.5 times/sec
Noise rejection ratio
：NMR40dB TYP (50/60Hz)
Temperature
characteristics
：Offset displayed-value:
Within ±0.3digit/℃
Fullscale displayed-value
Within ±0.3digit/℃
Overrange warning
：”1999”flashes for input signal
exceeding the maximum display.
Fullscale variable
range
：100 to 1999
Offset variable range
：±1000
Span
：2000 counts
Display
：LEDs(Light Emitting Diodes, Numeric
elements)
Character height;8mm(red)
Polarity display
：：”－” is automatically displayed when
the measurement result is minus.
External control
：・Scaling function：
Set by the multi-rotating variable
resistor on the front surface.
・External hold：
0V signal or contact signal (shorting)
・External start：
Positive pulse of +5V for more than 1ms
from 0V or contact signal (open)
・Decimal point：
The position of the decimal point can
be freely set by the stud pin on the
front surface.
Analog output
：0 to ±2V
Load resistance; More than 1kΩ
Control method
：Analog comparator
Comparison setting
range
：100 to +1999(for both high and low
limits)
However for offset display, the offset
value becomes the minimum value of the
setpoint.
Comparison setting
accuracy
：Setpoint ±2digit(23℃±5℃)(TYP)
Setting
: Set by selector switch.
Set by the multi-rotating variable
resistors for both HI and LO.
Comparison output
relays
：Relay output for HI and LO;
250V AC, 0.1A Max. Resistive load
120V AC 0.5A MAX. Resistive load
28V DC 1A MAX. Resistive load
Mechanical service life;
More than 5 million times
Electrical service life;
More than 100,000 times
(at rated load)
Comparison operation
indication
：For both HI and LO;
Red LEDs on the front surface light.
Comparison conditions
：For HI;
High-limit setpoint≦Displayed value
For LO;
Low-limit setpoint> Displayed value
Hysteresis
：None
Response
：5ms(TYP)
Dielectric strength
：Between power supply terminal (0V) and
input terminal (LO);
For 1 min. at 500V DC
Between input terminal (LO) and case;
For 1 min. at 1500V AC
Insulation resistance
：Between each terminal described
above; More than 100MΩat 500V DC
Operating temperature/
humidity range
：0 to 50℃/
35 to 85％RH（No-condensing）
Power supply voltage
：24V DC
Allowable voltage
variation range
：24V DC±20%
Consuming current
：35mA(TYP)(At 24V DC)
Dimensions
：48(W)×24(H)×87(D)DIN size
Weight
：Approx. 55g(Only for the mainframe)
Accessories
：Instruction manual 1 copy
Connectors 2 pcs.
Scaling label 1 sheet
Others
：If you need to display engineering
units, please contact us.
Compliance standard
：EN61326-1/2006
EMI:Class A
EMS:Industrial locations
※Cable length: 30m or less
※In the case of DC drive DC power
Supply port: DC connections
between parts of equipment
EN61010-1:2001
Mounting environment
：Mounting category Ⅱ
Pollution level 2 (IEC1010-1)
Mounting altitude
：Lower than 2000m
Fuse
：MC3/10. 125V, 0.3A
Quick blow type
MODEL AM-212 Series (2/4)
WATANABE ELECTRIC INDUSTRY CO., LTD.

■Connector connection diagrams
CAUTION
NC is a vacant terminal, but do not use it as a junction terminal.
CAUTION
When wiring is made, take such treatment to cover each wired
terminal with an insulation tube.
If the relay output of this meter is used to close or open an inductive
load (relay or solenoid), in order to prevent contact damage (welding,
etc.) caused by electric arc, to heighten the reliability of contacts
and also to extend a meter service life, it is recommended that a
contact protection circuit be inserted in the output of the meter.
*The above values may not always be correct depending on the
characteristic of the load used. Therefore, finally determine these
values in the actual circuit.
５.System functions
5-1 Start/Hold
If the HOLD terminal (No.7 on the lower connector) is shorted with
the COM terminal (No.8 on the lower connector), the displayed value
just after their shorting is held. In addition, measurement will
start by opening these terminals at the necessary timing. The
minimum time required for one time of measurement is about 400ms.
Perform control using mechanical contacts such as relays or
switches. When performing control using TTL or transistors, add
such a circuit as shown in Fig.5.
5-2 Decimal point position setting
First, turn off the power supply and input; insert a screwdriver
in the groove at the bottom of the front panel; and then lightly
turn the screwdriver in the groove to remove the front panel from
the case. The position of the decimal point can be set by the stud
pin on the front surface. The decimal point is not set to any
position prior to meter factory shipment. Therefore, set it to the
desired position at the site. (See Fig.6.)
5-3 Offset adjustment
Apply the minimum measured-voltage (current) to the input
terminals of the meter, then turn the ZERO adjuster from 0 to ±
1000 until the desired display is obtained. (See Fig.6.)
5-4 Fullscale adjustment
Apply the minimum measured-voltage (current) to the input
terminals of the meter, then turn the SPAN adjuster from 100 to
2000 until the desired display is obtained. (See Fig.6.)
5-5 Comparison setting
Turn the slide switch at the front to the LO position, then set
the desired value by turning the LO setting multi-rotating
variable resistor. Next, turn the slide switch to the HI position,
then set the desired value by turning the HI setting
multi-rotating variable resistor. Always set the LO setpoint to
any value smaller than the HI setpoint.
CAUTION
Do not touch any parts other than those specified.
６.Analog output
７．Maintenance
7-1 Cautions for maintenance
Store the meter at a storage temperature of -10℃to +70℃and a
humidity of less than 60%RH. As the case and panel are made of
plastics, do not use any volatile oil such as thinner for removing
stains on them.
Output voltage
：0 to ±2V
Accuracy
：±0.5% of FS
Ripple
：Less than 15mVp-p
Response
：Within 3ms
Load resistance
：More than 1kΩ
WATANABE ELECTRIC INDUSTRY CO., LTD.
MODEL AM-212 Series (3/4)

８.Warranty
This meter is warranted for a period of one year from date of
delivery. Any defect which occurs in this period and is undoubtedly
caused by Watanabe faults will be remedied free of charge. This
warranty does not apply to the meter showing abuse or damage which
has been altered or repaired by others except as authorized by
Watanabe electric co.,Ltd.
９.After-sale service
This meter is delivered after being manufactured, tested and
inspected under strict quality control. However, if any problem
does occur, contact your nearest Watanabe sales agent or Watanabe
directly giving as much information on problem as possible.
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/
MODEL AM-212 Series ED-34913c (4/4)