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Latest News from Weschler Instruments
70 Years of Power & Process Measurements
Page 1 of 2
November 2010
Ground Detection Voltmeter
In This Issue:
• Ground Detection Voltmeter
• Ethernet Network Interface
• Wiring Inspection & Test
A ground detection voltmeter is used to monitor a floating battery bank for
inadvertent grounding of either side. Historically, a center zero analog meter
has been used for this application. The meter typically has a 500uA or 1mA
DC movement, with a voltage scale of 100-0-100 for a 72V battery bank, 1500-150 for a 125V battery bank or 300-0-300 for a 250V battery bank. Two
high value resistors are installed across the battery and the center tap
connected to the grounded meter. A low impedance to ground on either side
of the battery causes the meter to move off center, indicating both the severity
of the fault and which side it is on. The resistor value is selected so that a
direct short to ground reads the full voltage.
• Universal Signal Conditioner
A digital bargraph meter will easily replace the analog meter in this circuit,
often mounting in the same panel cutout. The bargraph meter provides both
a digital readout and a highly visible bar to indicate a fault situation. To help
spot a problem more quickly, a tricolor bar can be configured to change color
when a threshold level is exceeded in either direction. The bargraph meter
offers several other improvements over the analog meter. It may include
relay outputs to activate a service alert or alarm at specific fault levels. It may
also have a digital interface for remote monitoring through a network or
SCADA system. Digital Bargraph Meters
Network Interface for Instrument Cluster
Measurement & Control News
is a newsletter highlighting
products, applications and
information of interest to
instrumentation users.
Laurel Electronics has introduced a new Ethernet interface that simplifies
networking for a cluster of panel meters. The Laureate Ethernet-to-RS485
Device Server Board plugs into a host Laurel digital panel meter, counter or
timer and provides a 10/100Base-T connection on an industry-standard RJ45
jack. It also has an RJ11 jack for interface to downstream meters on a RS485
bus, which can support up to 31 meters. This allows a group of Laurel digital
meters to access the internet through a single Ethernet connection. Dual
RJ11 connectors on each RS485 interface permit daisy-chaining using
commercial 6-wire RJ11 data cables.
The Modbus TCP protocol is fully supported. Conversion to Modbus TCP is
provided transparently so that an Ethernet application program can use the
Modbus TCP protocol while the meters use the Modbus RTU or Modbus
ASCII protocol. The Laurel ASCII protocol can also be used if the only
devices on the data line are Laureate meters.
Latest News from Weschler Instruments
Visit for:
• Digital Meters
• Analog Meters
• Bargraph Meters
• Controllers
• Sensors & Transducers
• Signal Conditioners
• Test Equipment
We carry Weschler products
and products from 50 of the
leading equipment brands.
Laurel's Node Manager software is shipped with each Ethernet interface. This
Windows-based application automatically discovers & configures all Laurel
nodes on a LAN or WAN, plus any meters connected to the nodes. (A node
is any meter with an Ethernet interface, including the host meter for the
Ethernet-to-RS485 Device Server Board). Laurel Panel Meters
Wiring Inspection & Test Tool
The new Amprobe INSP-3 Wiring Inspector Tester
quickly verifies building wiring compliance to electrical
code. This tester measures voltage drop under load
to identify problems with connections, splices and
conductor quality. The operator can select a load of
0, 10, 15 and 20 amps, which is constant, regardless
of line voltage. The INSP-3 checks ground quality for
safety and ability to support sensitive electronic
equipment. Voltage under load, voltage drop,
hot/neutral voltages and ground impedance are all
presented on a single operator display to save time.
No need to scroll thru multiple screens.
This versatile meter also tests GFCI and AFCI
operation. All load tests are done without tripping
circuit breakers or blowing fuses. The handheld
Amprobe INSP-3 operates from a single 9V battery and comes with carrying case and 120V AC test plug.
Data Sheet Other Amprobe Testers
Universal Signal Conditioner
Weschler Instruments
16900 Foltz Parkway
Cleveland OH 44149 USA
phone: 800-903-9870
email: [email protected]
Offices in OH, NY, FL & TX
Red Lion has consolidated a line of signal conditioning
modules into one model with the introduction of the IAMS
Universal Signal Conditioner. This field-configurable
device accepts process, DC current, DC voltage,
thermocouple, RTD, potentiometer and linear resistance
inputs, allowing it to be connected to most common
sensors. The IAMS features well over 100 combinations
of input to output (range and function) configurations.
The power supply is also universal, operating over a wide
range: 21.6-253 VAC or 19.2-300 VDC.
Add the optional programming display and the IAMS is
easily set up through menu style programming. Only one
programming unit is required to set up multiple devices. The module can store
programming from one unit and load it to a second unit, reducing set-up time
for multiple installations. The removable programming unit can also be used
to provide a display of the process variable when it is not being used for
The basic full scale accuracy exceeds 0.1%. Onboard non-volatile memory
stores scaling values for future recall. All units come factory precalibrated for
all input and output ranges, but can be custom scaled in the field. The unit’s
environmental operating range is -20º C to 60º C. DIN rail mounting saves
time and panel space. The setpoint option allows dual setpoint control
capability through two Form A relays. The analog output option provides a
retransmitted analog signal (mA or DCV).
Data Sheet Other Red Lion products
Page 2 of 2