4310 Wireless Position Monitor
Instruction Manual
October 2009
9
UPDATE RATE AND NETWORK SIZE
UPDATE RATE (SECONDS)
DEVICES IN NETWORK
60
30
8
4
100
75
50
0
25
Figure 10. Update Rate and Network Size
NOTE: FOUR CHILDREN ARE ASSUMED WITH THE SAME UPDATE
RATE AND A CONSTANT TEMPERATURE OF 25
_
C (77
_
F).
POWER MODULE LIFE VERSUS UPDATE RATE
UPDATED RATE (SECONDS)
POWER MODULE LIFE (YEARS)
2
4
0
6
8
10
12
14
60
50
40
30
20
10
0
EXTENDED
STANDARD
Figure 11. Power Module Life Versus Update Rate
Communication Connections
A HART communicating device, such as a 475 or
375 Field Communicator, interfaces with the 4310
wireless position monitor. Convenient termination
points are located inside the front cover, as shown in
figure 22. The connection pins are not polarity
sensitive. The instrument must be powered before
digital communication will commence.
Wireless Communications
Devices in a WirelessHART network are time
synchronized and send their data to the gateway at
selectable update rates. The update rates of the
device have an effect on the number that the
NUMBER OF CHILDREN
IMPACT ON ON POWER MODULE LIFE
NUMBER OF CHILDREN
POWER
MODULE LIFE (YEARS)
8
6
5
2
0
14
NOTE: 60 SECOND UPDATE RATE, CONSTANT
TEMPERATURE OF 25
_
C (77
_
F).
16
12
10
8
6
4
2
0
7
4
3
1
EXTENDED
STANDARD
Figure 12. Number of Children and Power Module Life
2
60
80
40
0
20
−
20
−
40
POWER
MODULE LIFE (YEARS)
TEMPERATURE EFFECT ON POWER MODULE LIFE
TEMPERATURE (
_
C)
NOTE: FOUR CHILDREN ARE ASSUMED WITH
60 SECOND UPDATE RATE, CONSTANT.
4
0
6
8
10
12
14
EXTENDED
STANDARD
Figure 13. Temperature Effect on Power Module Life
gateway can service. For example, if each device
sent an update once per minute the gateway could
support 100 devices. Figure 10 shows the
correlation between the number of devices that can
be supported versus update rates.
Battery powered devices conserve energy by only
sensing and transmitting data at the selectable
update rate. The faster the update rate the the lower
the life span of a power module. Figures 11, 12, and
13 show the correlation between power module life
and update rate, the number of children, and
temperature, respectively.
