Series 2000 Surge Suppressors for
the Siemens Digital Level Sensor
Providing level sensor protection
The Series 2000 surge suppressors are
in-line protection devices to cover the
power supply and RS485 communication
wiring between a remote sensor and a
terminal processing unit. The device has a
three-level suppression circuit that
prevents voltage and current transients
from damaging the electronic interfaces.
A protective coating permits
operation in corrosive environments.
Published by and copyright © 2010:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Energy, Inc.
Oil & Gas Division
10730 Telge Road
Houston, TX 77095 USA
Phone: 1 (888) 856-4528
www.siemens.com/energy/dls
Order No. E50001-D440-A161-X-76US
Printed in USA
BU 1749D IN 1210.25
All rights reserved.
Subject to change without prior notice.
Trademarks mentioned in this document are the property of Siemens AG,
its affiliates, or their respective owners.
The information in this document
contains general descriptions of the
technical options available, which may
not apply in all cases. The required
technical options should therefore be
specified in the contract.
The communication signals and power
supply lines are limited to 12 VDC by
transient voltage suppressors (tranzorbs)
to cover light and medium transients. All
lines are additionally protected against
highly powerful transients by high-current
solid-state crowbars, which respond within
nanoseconds when voltage levels exceed
25 VDC and provide a full path to ground.
The bypass stops when the transient fades
out and when the minimum holding
current is no longer supported. A third
level of protection is provided by selfresetting solid-state fuses that opencircuit the bypass after transients subside
and prevent a bypass overload to the
power supply.
A power-indicating LED brightens when
a minimum 10 VDC is present and darkens
with crowbar activation. The Model
2301 has the additional feature of
communication-indicating LEDs for RS485
transmit-receive signals. This feature is
very useful when troubleshooting field
communications.
Model 2261R4
Model 2301 – with communications LED
Specifications
Board size: 2.50 inches by 3.25 inches
18-inch insulated ground strap
Optional mounting bracket for wider
hold spacing.
Answers for energy.
For more information about this and other
digital level sensor products and applications, contact us at +1 (888) 856-4528 or
oilandgaslcm.energy@siemens.com.