Replace The Power Module - Emerson Rosemount 928 Reference Manual

Reference Manual
00809-0100-4928
3. Calibrate the new sensor.
4. Allow the Rosemount 928 Wireless Gas Monitor to warm up before continuing.
5.12

Replace the power module

Complete the following steps to replace the power module on the device.
About this task
Expected power module life is 5.8 years at reference conditions.
As shown in the following table, actual power module life expectancy in the field depends
upon factors such as wireless update rate, network design, environmental conditions, and
LCD settings.
WARNING
• Replace the power module as soon as possible after receiving a low battery morning. If
you do not do this promptly, the device will cease to function.
• You may replace the power module in a hazardous area. The power module has a
surface resistivity greater than 1 Gigaohm, and you must install it properly in the
wireless device enclosure. Take care during transportion to and from the point of
installation to prevent electrostatic charge buildup.
Table 5-1: Power Module Life Expectancy
No data routing (77 °F [25 °C])
Update rate
1
2
4
8
16
32
(1) Reference conditions are 70 °F (21 °C), wireless updates of once per minute, and routing data for three additional network
devices.
Refer to Calibrating the Rosemount
Refer to the following table for maximum warm up times based on gas type. During
the warm up period, the displayed values, alerts, and concentrations will not reflect
actual measurements; readings will not be transmitted.
Gas type
Hydrogen sulfide (H S)
2
LCD off
lifespan
(years)
2.1
3.3
3.8
4.4
5.1
5.3
™
628 Gas Sensor Module
Maximum warm up period
One minute
Routing data for three other devices (77 °F
[25 °C])
LCD on Update rate
lifespan
(years)
2.0 1
3.0 2
3.4 4
3.9 8
4.4 16
4.6 32
Operation and maintenance
August 2018
.
(1)
LCD off LCD on
lifespan lifespan
(years) (years)
1.1 1.1
2.0 1.9
2.7 2.5
3.6 3.3
4.5 4.0
5.0 4.3
155