Y800 Digital Panel Meter for Load Cell &

Y800Plus Digital Panel Meter
for Load Cell & Microvolt Input
20, 50, 100, 250 & 500 mV ranges
Span adjust from 0 to ±99,999, zero adjust from -99,999 to +99,999
Selectable fixed right-hand zero with rounding
Isolated 10 Vdc supply to power up to four 350-ohm load cells in parallel
4- or 6-wire hookup to avoid lead resistance effects
1 Gohm input impedance
Up to 60 conversions per second
Peak or valley display
Auto-tare with tare value stored in memory
Universal AC power, 85-264 Vac
1/8 DIN case sealed to NEMA-4X from front panel
Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485
• Optional relay output: dual or quad relays, contact or solid state
• Optional isolated analog output: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Optional low voltage power: 10-48 Vdc or 12-32 Vac
The Y800Plus load cell & microvolt meter is a high-sensitivity
monitor and controller for use with load cells, strain gauges and
microvolt input signals where high accuracy and stability are
DC microvoltmeter operation provides sensitivity down
to ±20 mV full scale with 1 µV resolution. A display span of
99,999 counts with sensitivity of 0.2 µV per count can be
obtained by applying a digital multiplier of five. A moving
average digital filter assures quiet readings in electrically
noisy environments.
• Load cell operation allows six-wire hookup and scaling for
direct readout in engineering units, such as pounds, kilograms
or PSI. Scaling can be via front panel pushbuttons or a computer. Zero may be set from -99,999 to +99,999. Range may
be scaled from 0 to ±99,999. Digital scaling and calibration
eliminate drift caused by potentiometers in nonmicrocomputer based meters.
Meter accuracy is 0.01% of full scale ± 2 counts with an ideal
load cell. Custom curve linearization, which is available with the
optional Extended main board, can extend the working range of
real-world load cells. Custom curve linearization also allows high
accuracy to be achieved with lower cost, less linear load cells.
A built-in isolated 10 Vdc excitation supply can provide up to
120 mA of current at 10V to power four 350-ohm load cells in
parallel. The meter operates in a ratiometric mode to eliminate
errors due to supply variations. When excitation sense inputs are
used in 6-wire connection, the meter compensates for variation in
resistance of the transducer leads to allow long cable runs.
High read rates at up to 60 or 50 conversions per second while
integrating the signal over a full power cycle are provided by
Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, realtime computer interface, and control.
Peak and valley values are automatically captured. These
may be displayed via a front panel pushbutton or control signal at
the rear connector, or be transmitted as serial data.
Digital filtering is selectable for electrically noisy environments,
including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms
to 9.6 s. When a significant change in signal level occurs, that
filter adapts by briefly switching to the shortest time constant to
follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is
automatically selected based on detected signal noise.
Easy scale and offset are provided by Y800Plus DC, process and
load cell meters by either of two selectable methods:
• With the coordinate reading method, the meter reads the
high and low signal values, and the user enters the desired
high and low reading values. The meter then calculates the
span multiplier and offset. This method is ideal if an external
calibration reference is available.
• With the manual coordinate method, the user enters the
high and low input values in Volts plus the desired high and
low reading values. This method is suitable if no external
calibration reference is available.
Auto-tare is standard for weighing applications to subtract the
weight of an empty container and may be controlled by an external pushbutton contact closure or a logic signal. Additional
capabilities for weighing applications are provided by the Y800Plus
weight & scale meter.
Designed for system use. Optional plug-in boards include
Ethernet and other serial communication boards, dual or quad
relay boards, and an isolated analog output board. Y800Plus
meters may be powered from 85-264 Vac or optionally from 1232 Vac or 10-48 Vdc. The display is available with red or green
LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications
from the front when panel mounted. Any setup functions and
front panel keys can be locked out for simplified usage and
security. A built-in isolated 5, 10, or 24 Vdc excitation supply can
power transducers and eliminate the need for an external power
supply. All power and signal connections are via UL / VDE / CSA
rated screw clamp plugs.
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com
DC Microvolt Input
Input Range, mV
Input Resistance
Error at 25°C
1 µV
1 µV
10 µV
10 µV
10 µV
1 GΩ
0.01% FS
± 2 counts
Load Cell Input
Full-Scale Input, mV
Zero Adjust
Span Adjust
Input Resistance
Error at 25°C
0 to
1 GΩ
0.01% FS
± 2 counts
DC Microvolts & Load Cell
Error at 25°C
Span tempco
Zero tempco
Load cell linearization
0.01% FS ± 2 counts
0.0015% of reading/°C
0.1 µV/°C
Provided by Extended meter version
Noise Rejection
CMR, DC to 60 Hz
NMR at 50/60 Hz
130 dB
90 dB with min filtering
A-to-D Conversion
A-to-D rate
Output update rate
Display update rate
Concurrent Slope™ (Pat 5,262,780)
60/s at 60 Hz, 50/s at 50 Hz
56/s at 60 Hz, 47/s at 50 Hz
3.5/s at 60 Hz, 3/s at 50 Hz
5 LED digits, 7-segment, 14.2 mm (.56"), red or green.
-99999 to 99999 or -99990 to 99990 (count by 10)
Minus sign, 2 red LED lamps
Voltage, standard
Voltage, optional
Power isolation
85-264 Vac or 90-300 Vdc (DC operation not UL approved)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
Selectable levels
Output isolation
5 Vdc ± 5%, 100 mA; 10 Vdc ± 5%, 120 mA; 24 Vdc ± 5%, 50 mA
50 Vdc to meter ground
Analog Output (optional)
Output Levels
Current compliance
Voltage compliance
4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
2 mA at 10V ( > 5 kOhm load)
12V at 20 mA ( < 600 Ohm load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay types
Current ratings
2 Form C contact relays or 4 Form A contact relays (NO),
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
120 mA at 140 Vac or 180 Vdc for solid state relays
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com
Output common
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board selections
Ethernet, Ethernet-to-RS485 server, USB, USB-to-RS485 server, RS485
(dual RJ11), RS485 Modbus (dual RJ45), RS232.
Modbus RTU, Modbus ASCII, Custom ASCII protocol
300 to 19200 baud
247 (Modbus), 31 (Custom ASCII)
250V rms working, 2.3 kV rms per 1 min test
Data rates
Digital addresses
Signal Connections
Operating temperature
Storage temperature
Relative humidity
0°C to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Load Cell Meter Connections
In 4-wire connection, the excitation and sense lines
are tied together. The meter can make ratiometric
corrections for supply voltage variations, but not
compensate for variations in lead resistance. This
connection is often used with short cable runs.
In 6-wire connection, the sense lines are separate
from the excitation lines, thereby eliminating effects
due to variations in lead resistance. This allows long
cable runs in outdoor environments with temperature
For large scales, up to four 350 ohm load cells can
be powered by a single Y800Plus meter, whose excitation output is rated 120 mA at 10 V. The excitation
and sense points of the four bridges are connected in
parallel through a summing box.
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com
Seat belt tensile strength testing using Y800Plus digital panel meters.
The three meters display Force, Displacement and Speed.
Sample Applications
To read the net weight of an object, the empty container is first
weighed, and an external button is pushed to zero out the display.
The meter will then read net weight when an object is added to
the empty container. The tare value is stored in memory for
subsequent readings.
Determining Volume Using Load Cells
An easy way to determine volume of an irregularly shaped tank
with no need for linearizing is to weigh the tank using load cells.
The meter will automatic- ally tare out the weight of the empty
tank and then scale the load cell signals to units of volume, such
as liters or gallons.
Peak Capture for Tensile Strength of Wire
Peak readings are automatically captured at rates up to 60 per
second, while the display updates at a legible 3.5 per second. The
peak reading can be recalled at the push of a button or be always
displayed. It can also be transmitted to a computer via RS232,
RS485., USB, or Ethernet.
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com
Ordering Guide
Create a model a model number in this format: Y810000WM, IPC
DPM Type
Y8 Y800Plus Digital Panel Meter
Main Board
Standard Main Board, Green LEDs
Standard Main Board, Red LEDs
Extended Main Board, Green LEDs
Extended Main Board, Red LEDs
Note: Extended capability is only required for custom curve linearization or for
display of time rate of change, such as flow rate from changing tank weight.
0 85-264 Vac
1 12-32 Vac or 10-48 Vdc
Relay Output
Analog Output
0 None
1 Isolated 4-20 mA, 0-20 mA, 0-10 V, -10 to +10V
Digital Interface
Signal Input
Load Cell (6-wire ratio)
Field Scalable. Default scaling is 0-20 mV = 0-100.00
Custom Scaling. In the write-in field of your order, specify min input, min
reading; max input, max reading. Full-scale input is 20-500 mV. Excitation is
10 V for up to four 350-ohm load cells.
Add-on Options
Two 8A Contact Relays
Two 120 mA Solid State Relays
Four 8A Contact Relays
Four120 mA Solid State Relays
RS485(dual RJ11 connectors)
RS485 Modbus (dual RJ45 connectors)
USB-to-RS485 device server
Ethernet-to-RS485 device server
Blank Lens without Button Pads
RJ11-to-DB9 Cable
USB-to-DB9 Adapter
USB Cable, A to B
Splash-proof Cover
NEMA-4 Enclosure
NEMA-4 Enclosure plus IPC
2 Dart Rd, Newnan, GA 30265, USA • Tel 770-251-8700 • Fax 770-251-2088 • http://www.yca.com