Mechanical Technology July 2016

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Mechanical Technology — July 2016 39
⎪ Products and services ⎪
Fluke and HART Scientific have revolu-
tionised environmental monitoring for
calibration labs with their model 1620A
DewK temperature and humidity instru-
ment, which offers Ethernet and wireless
connections and upgraded LogWare III
software.
Two types of sensors are available
from Hart. The high-accuracy sen-
sor (H model) reads temperature to
±0.125 °C over a calibrated range of
16 °C to 24 °C. Relative humidity read-
ings are to ±1.5% RH from 20% RH to
70% RH. The standard-accuracy sensor
(S model) reads temperature to ±0.25 °C
HyPer gearboxes with
electronic load detection
BMG’s extensive range of drives and
motors now encompasses newly
launched products from Dinamic
Oil, the leading manu-
facturers of hoisting
winches and plan-
etary gearboxes. Most
notable is Dinamic
Oil’s high performance
HyPer gearboxes and an
electronic load detection
system for precise control
and enhanced safety.
“HyPer gearboxes combine
Dinamic Oil’s GB series gearboxes with
the modular advantages provided by parallel
shaft and helical bevel gearboxes, as well as
gearmotors,” says Bryan Pickles, BMG’s brand
manager. “These new combined unit gearboxes
offer high torque to weight ratios for optimum
performance in diverse applications, including
conveyor drives, construction, mining and quar-
ries, marine tensioners, industrial and marine
lifting equipment and machines for steel pro-
duction plants and sugar mills.”
This flexible combined unit has an output
torque up to 3.0-million Nm, gear ratios starting
from 40 and combined electric motor-inverter
power of up to 22 kW.
The new electronic load detection system,
which is mounted on the winch structure, uses
an analogue or digital signal to control torque,
as well as to precisely control the lifting and
lowering load. This flexible system, which is pro-
grammed to users’ exact requirements, permits
load control of the crane’s winch, while display-
ing its value on the remote control. This enables
easy movement and ensures optimum safety.
BMG, which was appointed exclusive dis-
tributors for Dinamic Oil over 10 years ago,
supplies and supports the full range of plan-
etary gearboxes, as well as slewing, winch,
track and wheel drives; hydraulic hoisting and
pulling winches; motor drums and tower crane
winches.
SKF has announced the availability of its
new pure refrigerant lubricated bearings,
a unique oil-free solution for direct drive
centrifugal compressors in chillers that
use low-viscosity refrigerant as the bear-
ing lubricant. By eliminating the need for
oil lubrication, the bearings reduce chiller
energy use while simplifying system
design and maintenance requirements.
Pure refrigerant lubricated bearings
from SKF combine ceramic (silicon
nitride) rolling elements, rings made
of high-nitrogen, specially heat-treated
stainless steel and glass-fibre reinforced
PEEK cages. The result is a bearing that
can operate reliably using low-viscosity
refrigerant as a lubricant, an innovation
that enables energy savings of at least
10% compared to conventional centrifu-
gal compressor drive designs.
Traditionally, centrifugal compressors
using low-viscosity refrigerants have
been gear-driven designs that use hy-
drodynamic bearings lubricated with an
oil-refrigerant mixture
“It’s an approach that requires both
a lubrication system and an oil separator
to provide an oil-rich mixture to the gears
and bearings and a refrigerant-rich mix-
ture to the evaporator and condenser,”
New oil-free pure refrigerant lubricated bearings
Refrigerant lubricated bearings from SKF
are already at work in industry-leading
chillers, helping to lower energy use and
costs, reduce maintenance, and eliminate
oil-related environmental concerns.
explains Richard Law, SKF global seg-
ment manager for fluid machinery. “Pure
refrigerant lubricated bearings from SKF
provide simplified system design and oil-
free operation by allowing low-viscosity
refrigerants to be used as the lubricant
in direct drive centrifugal compressors,
enabling a much more energy efficient,
low-maintenance solution.”
Tested and proven reliable through
more than a decade of field operation,
pure refrigerant lubricated bearings from
SKF are already at work in industry-
leading chillers, helping to lower energy
use and costs, reduce maintenance,
and eliminate oil-related environmental
concerns.
Thermo-hygrometer for environmental control
over its calibrated range of 15 °C to
35 °C. Relative humidity readings are to
±2.0% RH from 20% RH to 70% RH.
All DewK sensors come with NVLAP ac-
credited certificates of calibration for both
temperature and humidity, complete with
data and NIST traceability.
The DewK features built-in Ethernet
RJ45 jack and multiple DewKs can be
monitored from the same screen using
the new LogWare III client-server soft-
ware. Ethernet also allows for remote
connectivity over the Internet, so that
critical conditions can be monitored from
a remote location and data can be sent
to a printer through the RS-232 interface
in real time.
In addition to temperature and hu-
midity, the DewK calculates dew point,
heat index, and rates of change for both
temperature and humidity. Min, max,
and a variety of other statistics are also
calculated and can be shown on-screen.
Daily summary statistics, including min,
max, and maximum rates of change are
stored for the most recent sixty days.
The instrument has inputs for two
sensors, each measuring both tempera-
ture and relative humidity, so that the
DewK can monitor two locations simul-
taneously. Both sensors can be run via
extension cables to remote locations up
to 100 feet away, or one sensor can be
directly mounted to the top of the DewK.
The DewK has the memory capac-
ity for up to 400 000 date- and time-
stamped data points – two years’ worth
of data taken at ten minute intervals.
Alarm settings are easily set based on
temperature, the rate of change in tem-
perature, RH, the rate of change in RH,
and instrument fault conditions.
The DewK calculates dew
point, heat index, and
rates of change for
temperature and
humidity.