Emerson Rosemount 928, Reference Manual

Page: 163 / 204

Table 5-3: Power Module Life Expectancy
No data routing (77 °F [25 °C]) Routing data for three other devices (77 °F
[25 °C])
Update rate LCD off
lifespan
(years) LCD on
lifespan
(years) Update rate LCD off
lifespan
(years) LCD on
lifespan
(years)
1 2.1 2.0 1 1.1 1.1
2 3.3 3.0 2 2.0 1.9
4 3.8 3.4 4 2.7 2.5
8 4.4 3.9 8 3.6 3.3
16 5.1 4.4 16 4.5 4.0
32 5.3 4.6 32 5.0 4.3
60 5.4 4.7 60 5.1 4.5
Procedure
1. Remove the rear housing cover from the transmitter.
2. Remove the depleted power module.
3. Install a new Emerson 701 SmartPower
™
Module - Black.
4. Replace the rear housing cover and tighten it to specifications. Tighten until metal
touches metal to ensure a proper seal, but do not overtighten.
5. Allow the transmitter to warm up before continuing.
Refer to Table 5-4 for maximum warm up times, based on gas type. During the
warm up period, the displayed values, alerts, and gas concentrations will not reflect
actual measurements; the device will not transmit readings.
Table 5-4: Maximum Warm up Periods
Gas type Maximum warm up period
Hydrogen sulfide (H
2
S) One minute
Oxygen (O
2
) Seven minutes
Carbon monoxide (CO) One minute
5.12.1 Handling the power module
The Emerson 701 SmartPower
™
Module - Black included with each Rosemount 928
contains two "C" size primary lithium/thionyl chloride batteries. Each battery contains
approximately .08 oz. (2.5 grams) of lithium, for a total of .18 oz. (5 grams) in each pack.
Under normal conditions, the battery materials are self-contained and are not reactive as
long as the batteries and the battery pack integrity are maintained. Take care to prevent
thermal, electrical, or mechanical damage. Protect contacts to prevent premature
discharge.
Reference Manual Operation and maintenance
00809-0100-4928 September 2019
Rosemount 928 163