8
LENS data travel in a nonlinear manner. With the locations of peer instruments A through F as shown
below in Figure 1.1, messages travel among instruments that may be separated by distance or by a
structure (gray bar). For example, if instrument "E" experiences an alarm, the other instruments in the
group will experience a peer alarm, which will include details about the instrument that is in alarm.
As a guideline, a line-of-sight distance up to 100 m (109 yd), between two Ventis Pro instruments that
are facing each other, allows an instrument to maintain membership in its group.
Figure 1.1 Snapshot of LENS Wireless peer-instrument locations
iNet Now Considerations
iNet Now
is a live-monitoring software solution from Industrial Scientific. Using Bluetooth technology, gas-
detection instruments, and smart devices, it delivers to safety team members instrument gas readings,
alarms, and other data—in real time.
When iNet Now is in use, the following apply.
An in-range smart device must be running the
iNet Now Sync app
.
A line-of-sight distance of up to 30 m (32 yd)—between the Ventis Pro and the smart device—generally
serves to maintain the Bluetooth connection.
If a Ventis Pro has lost its connection to the smart device, its data upload to iNet Now can be
maintained
only when
it is part of a LENS group that includes no more than six instruments, and at
least one instrument in the group is communicating with any smart device that is running the iNet Now
Sync app.
Remote Sampling
When sampling with a motorized pump and sampling line, Industrial Scientific recommends the following:
Choose the tubing type based on the target gases. If the target gases are
known
, use Teflon-lined
tubing when sampling for these gases: chlorine (Cl
2
), chlorine dioxide (ClO
2
), hydrogen chloride (HCl),
and volatile organic compounds (VOCs). For other
known
target gases, urethane tubing or Teflon-lined
tubing may be used.
When the target gases are
unknown
, use Teflon-lined tubing.
Know the length of the sample line as it is a factor in determining sampling time. A sample line may
consist of tubing, a probe, or a probe and tubing. It should also have a dust filter–water stop installed at
the line's end that will extend into the sample area. Sample-line length is defined as the distance from