Install Guide

SENSIT SYSTEM | MANUAL
Frequently Asked Questions
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What is a Relay Node 2G?
A Relay node 2G is a dedicated product for relaying message from the SENSIT
sensors to the SENSIT Gateway. The Relay Node 2G has an active role and in the
Wireless SENSIT Network. The battery lifetime of the Relay Node 2G is similar as the
lifetime of the SENSIT sensors. The Relay Node 2G is wireless and does not require
any power or communication cabling.
Why are Relay Nodes required?
Relay nodes are required to ensure a faster communication path to the SENSIT
Gateways, a more robust network and less energy consumption. Relay Nodes are
required to ensure that SENSIT sensors positioned in the area can communicate
directly via the Relay Node back to the central system. If each SENSIT sensor would
need to communicate via the other SENSIT sensors installed in the floor, more
communication ‘hops’ are needed. This will cause a slower communicating network,
with a higher chance of missing a message and higher energy consumption.
How much Relay Nodes do I need to install?
The number of Relay Nodes depends on various parameters: number of SENSIT
sensors, distances and obstructions. A minimum of 1 Relay Nodes and 1 SENSIT
Gateway is required per installation to create a 2 path communication possibility for
each SENSIT sensor. Nedap can provide you with more detailed information on the
amount of Relay Nodes per installation for your site.
Has Nedap a tool to determine the number of needed Relay Nodes?
There is a tool available to make a better estimation of needed equipment, see
chapter 4. Please ask your Nedap account manager for more information.
What is the communication distance between Relay Nodes and other components of
the system?
Below the maximum recommended distances between the different nodes.
SENSIT Gateway  Relay Node 25 m (82 ft)
Relay Node  Relay Node 50 m (164 ft)
SENSIT  Relay Node 25 m (82 ft)
SENSIT Gateway  SENSIT 25 m (82 ft)
SENSIT Gateway  Relay Node 2G omni-directional 35 m (115 ft)
SENSIT Gateway  Relay Node 2G directional 50 m (164 ft)
Data Collector GPRS Relay Node 2G 10 m (33 ft)
Relay Node 2G  Relay Node 2G 100m (328 ft)
SENSIT  Relay Node 2G omni-directional 35 m (115 ft)
SENSIT  Relay Node 2G directional 50 m (164 ft)
How do I replace a Relay Node?
After end of battery life, the SENSIT can easily be taken out of the Relay Node
mounting set. Only the SENSIT sensor configured as Relay Node would need to be
replaced. The batteries of a Relay Node 2G can be replaced, see chapter 10.7.
Can the Relay Nodes also be used for indoor car parks?
Yes, the Relay Nodes can also be used for indoor car parks. Indoor car parks might
require more Relay Nodes due to mounting height restrictions and influence of
concrete on communication.