AMS 9420 Wireless Vibration
Transmitter
Quick Start Guide
Quick Start Guide
MHM-97409, Rev 11
May 2019
Quick Start Guide May 2019
Copyright
©
2019 by Emerson. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language in any form by any means without the written permission
of Emerson.
Disclaimer
This manual is provided for informational purposes. EMERSON MAKES NO WARRANTY OF ANY
KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Emerson shall
not be liable for errors, omissions, or inconsistencies that may be contained herein or for
incidental or consequential damages in connection with the furnishing, performance, or use of
this material. Information in this document is subject to change without notice and does not
represent a commitment on the part of Emerson. The information in this manual is not allinclusive and cannot cover all unique situations.
Patents
The product(s) described in this manual are covered under existing and pending patents.
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Quick Start Guide May 2019
Safety messages
Instructions in this manual may require special precautions to ensure the safety of the personnel
performing the operations.
This AMS 9420 device complies with Part 15 of the FCC Rules. Operation is subject to the
following conditions: This device may not cause harmful interference, this device must accept any
interference received, including interference that may cause undesired operation.
This device must be installed to ensure a minimum antenna separation of 20 cm from all persons.
Refer to the following safety messages before performing an operation preceded by the warning
symbol:
WARNING!
Failure to follow these installation guidelines can result in death or serious injury. Only qualified
personnel should install AMS 9420s.
Explosions could result in death or serious injury:
• Before connecting a Field Communicator in an explosive environment, make sure the instruments
are installed in accordance with applicable field wiring practices.
• Verify that the operating environment of the AMS 9420 is consistent with the appropriate
hazardous locations certifications.
• Do not remove the front electronics end cap or LCD cover while the device is in a hazardous area.
Electrical shock can cause death or serious injury. Avoid contact with the leads and terminals. High
voltage that may be present on leads can cause electrical shock.
Contents
Introduction ................................................. 4
Install the AMS 9420
Join the AMS 9420 to a wireless
network ...................................................... 12
Verify the device is operational ................... 15
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..................................... 6
Installing required ferrites ...........................18
Shipping considerations for wireless products
(Lithium Batteries) ...................................... 21
Troubleshooting ......................................... 22
Product certifications ..................................23
Quick Start Guide May 2019
1 Introduction
This Quick Start Guide applies to the 2.4 GHz WirelessHART™ version of the
AMS 9420. It describes a typical installation with standard low-powered
sensors (25 mV/g) and a power module.
This document includes basic guidelines for the AMS 9420 Wireless Vibration
Transmitter. It does not provide instructions for detailed configuration,
diagnostics, maintenance, or service. The AMS 9420 Wireless Vibration
Transmitter Reference Manual (part number MHM-97408) contains more
instructions, and other sensor and power options. A digital version of this
document is available on the Emerson website,
http://www.emerson.com/en-us/catalog/ams-a9420.
The term "sensor" applies to both an accelerometer and an accelerometer
with embedded temperature; the word “accelerometer” refers to a sensor
that measures only acceleration.
The transmitter's main parts are shown in Figure 1-1.
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May 2019 Quick Start Guide
AMS 9420 overviewFigure 1-1:
A. Antenna
B.
Housing
C. Front electronics end cap or LCD cover
D. Mounting post
E. Cable entry port (one on left and right)
F. Extended end cap or power module cover
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Quick Start Guide May 2019
2 Install the AMS 9420
Before beginning installation procedures:
Insert the power module only when you are ready to commission the device.
Install the Emerson Wireless Gateway and ensure it functions properly before
you activate the AMS 9420 or any other wireless devices. Power up wireless
devices in order of proximity from the Emerson Wireless Gateway, beginning
with the closest. This will result in a simpler and faster network installation.
WARNING!
If the sensor is installed in a high-voltage environment and a fault condition
or installation error occurs, the sensor leads and transmitter terminals could
carry lethal voltages. Use extreme caution when making contact with the
leads and terminals.
2.1 Prepare sensors for use with the AMS 9420
This procedure describes installing the AMS 9420 with standard low-powered
sensors (25 mV/g nominal sensitivity). See the Reference Manual for
information about other options such as using ICP accelerometers (100 mV/g
nominal sensitivity).
Procedure
1.
Install sensors according to standard sensor installation practices. Use
thread sealant on all connections.
See the Reference Manual for detailed sensor mounting instructions.
Note
The AMS 9420 uses special low-power sensors (available for purchase
from Emerson) to reduce power consumption and increase power
module life.
2. Run wiring (and conduit, if necessary) from the sensor to the AMS 9420.
The AMS 9420 is not approved for use with a cable that is 30 m (100 ft) or
longer. The recommended maximum cable length is 29 m (95 ft). Shorter
is better.
If your cable is longer than 3 meters, you must attach ferrites at the AMS
9420 end of the cable. For armored cables, add ferrites before attaching
sensor wires to the transmitter. For standard cables, add the ferrites after
attaching the sensor wires to the transmitter. See page 18.
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May 2019 Quick Start Guide
3. Pull the wiring through the threaded conduit entry of the AMS 9420. If
you are not using conduit, use an appropriate grommet or cable-gland to
provide both strain relief for the cable and environmental isolation for the
AMS 9420.
2.2 Attach sensor wiring to the AMS 9420 terminals
Prerequisites
• If you are using armor-jacketed cable longer than 3 meters, you must
attach the ferrites before attaching sensor wiring the AMS 9420
terminals. See Section 5.2.
• If the sensor signal wires are not equipped with spade lugs, Emerson
recommends installing them before proceeding.
Procedure
1.
Tie the sensor's grounding wire (white with black stripe) to the ground
screw inside the AMS 9420.
See callout E in the figures below.
2. Refer to the appropriate figure to connect the sensor signal wires.
Note
You can connect one or two accelerometers to the AMS 9420. You can
connect only one accelerometer with a temperature sensor.
a. Insert a beryllium copper washer on top of each spade lug.
b.
Tighten the screw to 15 in-lbs (1.7 N-m).
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Quick Start Guide May 2019
AMS 9420 wiring with one accelerometerFigure 2-1:
A Sensor power Red wire
B Sensor signal White wire
C Unused Unused
D Sensor common Black wire
E Sensor grounding White wire with black stripe
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