Rosemount 928 Specifications

Product Data Sheet

00813-0100-4928, Rev AH

Rosemount™ 928 Wireless Gas Monitor

Integrated Wireless Gas Monitoring

September 2019

The Rosemount 928 Wireless Gas Monitor is the first integrated WirelessHART® toxic gas monitoring
solution with a tool-less hot-swappable sensor from Emerson. The Rosemount 928 extends detection
coverage to remote installations, eliminates wiring costs, and reduces installation and commissioning
times.

■

Hot-swappable electrochemical sensor module with end-of-life diagnostics can be installed in the field
without tools.

■

Hazardous location, performance, and functional safety approvals for worldwide use.

■

Large liquid crystal display clearly shows gas concentration and transmitter diagnostics.

■

Optional discrete output for activating field alarms.

September 2019

Features

WirelessHART® communication

Traditional electrochemical sensor technology is proven and reliable, but conventional products require a wired infrastructure for
power and signal communication. The Rosemount 928 requires no wired infrastructure and dramatically reduces installation and
maintenance costs.

Hot-swappable power module

The device uses a replaceable, intrinsically safe lithium-thionyl chloride power module.

The power module has over three years of service life

High performance monitoring

Table 1: Monitoring Ranges by Gas

(1)

and can be easily exchanged in the field in hazardous locations.

Gas Range Accuracy T20 T50 T90 Default

alarm

H2S 0-100 ppm ±3 ppm or

10% of
reading

CO 0-1000

ppm

O

2

0-25% by
volume

±6 ppm or
10% of
reading

±0.5%
oxygen
content of
supply gas

< 8
seconds

< 7
seconds

< 2
seconds

< 10
seconds

< 12
seconds

< 4
seconds

< 45
seconds

< 29
seconds

< 15
seconds

10 ppm < 5% per

100 ppm < 5% per

19.5% < 5% per

Zero drift Relative

humidity

10-95% -40 to

annum

10-95% -22 to

annum

5-95% -22 to

annum

Operating
temper­ature
range

+122 °F

-40 to
+50 °C

+122 °F

-30 to
+50 °C

+122 °F

-30 to
+50 °C

Contents

Features............................................................................................................................................................................................ 2

Ordering information........................................................................................................................................................................ 3

Specifications.................................................................................................................................................................................... 5

Product certifications........................................................................................................................................................................ 8

Dimensional drawings..................................................................................................................................................................... 14

(1) Power module service life depends on wireless update rate, local display settings, and ambient conditions.

2 Emerson.com/Rosemount

September 2019

Hot-swappable sensor

The Rosemount 928 uses the Rosemount 628 series of hot-swappable electrochemical gas sensor modules that can be installed in
the field with one hand and no tools.

The Rosemount 628 Universal Gas Sensor is a smart sensor. As such, it retains its own calibration information. It must be connected
to a Rosemount 928 Transmitter to calibrate, but the calibration settings are stored in the sensor itself rather than in the
transmitter. The Rosemount 628 Sensor may be uninstalled from one Rosemount 928 Transmitter and reinstalled in another
transmitter without affecting its calibration.

The device automatically recognizes the sensor. Built-in end-of-life diagnostics alert you when sensor replacement is necessary.

Built for harsh environments

The Rosemount 928 is designed to operate in ambient temperatures ranging from -40 °F to +122 °F (-40 °C to +50 °C).

Ingress protection levels of IP66 are achieved with the ingress protection (IP) filter fitted to the Rosemount 628.

Ordering information

Standard options

The starred options (★) represent the most common options and should be selected for best delivery. The non-starred options are
subject to additional delivery lead time.

Model Description

Product description

928 Wireless Gas Monitor ★

Transmitter output

X Wireless ★

Sensor options

SS Sensor specified separately and shipped with the transmitter (requires

specification of the Rosemount 628).

UT Universal transmitter (no sensor specified) ★

Discrete output

00 No discrete output; wireless communication only ★

01 Discrete output and wireless communications ★

Housing material

2A Aluminum ½-14 national pipe thread (NPT) conduit ★

2S Stainless steel ½-14 national pipe thread (NPT) conduit ★

Product certifications

★

I5 USA Intrinsically Safe ★

I6 Canada Intrinsically Safe ★

I4 Japan Intrinsic Safety ★

I1 ATEX Intrinsic Safety ★

Rosemount 928 3

September 2019

Model Description

I3 China Intrinsic Safety ★

I7 IECEx Intrinsic Safety ★

KQ USA CSA ATEX Intrinsic Safety ★

NA No approvals ★

Wireless options

The starred options (★) represent the most common options and should be selected for best delivery. The non-starred options are
subject to additional delivery lead time.

Model Description

Wireless update range, operating frequency, and protocol

WA3 User configurable update rate, 2.4 GHz DSSS, IEC 65291 (WirelessHART®) ★

Omnidirectional wireless antenna and SmartPower™ solutions

WK1 External antenna, adapter for black power module. (I.S. power module

sold separately)

WM1 Extended range, external antenna ★

WJ1 Remote antenna, adapter for black power module (I.S. power module

sold separately)

WN1 High-gain remote antenna, adapter for black power module (I.S. power

module sold separately)

★

★

★

Other options

The starred options (★) represent the most common options and should be selected for best delivery. The non-starred options are
subject to additional delivery lead time.

Model Description

Mounting bracket

B4 Universal L mounting bracket for 2-in. (50.8 mm) pipe mounting,

stainless steel bracket, and bolts

Configuration

C1 Factory configuration date, descriptor, message fields, and wireless

parameters

Quality documentation

★

★

Q1 Certificate of Compliance ★

Typical model number: 928 X SS 00 2A I5 WA3 WK1 B4

4 Emerson.com/Rosemount

September 2019

Rosemount 628 Universal Gas Sensor ordering information

The starred options (★) represent the most common options and should be selected for best delivery. The non-starred options are
subject to additional delivery lead time.

Model Description

Product description

628 Universal Gas Sensor ★

Sensor technology

EC Electrochemical ★

Gas type

T02 Hydrogen sulfide ★

A03 Oxygen ★

T04 Carbon monoxide ★

Unit of measurement

2 ppm ★

3 % by volume ★

Sensor range

F 0-100 ★

D 0-25

K 0-1000

Typical model number: 628 EC TO2 2 F

Spare parts

Description

Ingress Protection (IP) filter 00628-9000-0001

Spare B4 mounting bracket for Rosemount 928 03151-9270-0004

Part number

Specifications

Functional specifications

Measurement type

Gas concentration levels

■

Hydrogen sulfide (H2S): 0 - 100 ppm

■

Carbon monoxide (CO): 0 - 1,000 ppm

■

Oxygen depletion (O2): 0 - 25% by volume

Rosemount 928 5