Wilkerson Instrument DR9011, DR9021 Operating Manual

SPECIFICATIONS

DR9011 TRANSMITTER INPUTS

Dual DC Voltage or Current

Current Voltage
Min Span = 1 mA Min Span = 100 mV
Max Span = 50 mA Max Span = 150 V

Accuracy Linearity

±0.1% of span ±0.05% of span

Common Mode Rejection

= 100 dB, DC to 60 Hz

RTD Input – 100 ohm Pt

Min Span = 50°C
Max Span = RTD Limit
Linearity vs Temperature

= 0.1% / °C of span

Accuracy = ±0.1% of span
Bridge Input

Min Span = 0.5mV/V (10V excitation)
Max Span = 100mV/V
Linearity = ±0.05% of span

(referenced to V in)

Excitation Supply = 10.00V, 125mA max

(Drive four 330 ohm bridges in parallel)

Switch Input
Open Circuit Voltage Closed Circuit Current

10 to 30 VDC 3 to 9 mA

I/O Data Rate Tx to Rx

Update Rate = 10/S

DR9021 RECEIVER OUTPUT

Dual 4/20 mADC

12V Compliance
4 optically isolated Open Collector
NPN transistors

28V Max
35mA Max

OPERATING TEMPERATURE

-13°F to 167°F / -25°C to 75°C

TEMPERATURE STABILITY

± (0.01% of span)/°C max

POWER

DR9011

10 to 30 VDC, 1.5 Watts Max

DR9021

85 to 240 VAC, 2.0 VA Max
12 or 24 VDC, 1.5 Watts Max

Specifications Are Subject To Change Without Notice. © 2008 Wilkerson Instrument Co., Inc. DWG# W104066A 1/08

RADIO

Frequency

910 - 917 MHz (Standard)
920 - 927 MHz (Optional)

2.4000 - 2.4835 GHz

Transmit Output Power

900 and 923MHZ

100mW (20dBm)

2.4GHZ
50mW (17dBm)

Receiver Sensitivity

900 and 923MHZ

-110dBm

2.4GHZ

-105dBm

Spread Spectrum Type,

Frequency Hopping, Direct FM

7 Hop Sequences per Frequency

Range (Line of Sight)

900 MHz —

Up to 20 Mi. with high gain antennas

2.4GHz —
Up to 10 Mi. with high gain antennas

Antenna Connector

Reverse Polarity SMA Female

CERTIFICATIONS

RF Module — FCC Part 15.247
DR9011 and DR9021 — UL/cUL Recognized

SUPPORT

Wilkerson Instrument Company, Inc. wants to
help you get the most from your system. If
there is anything we can do, please call or fax
us.

Telephone: [phone]
Fax: [phone]
Or, you can email us: [e-mail]
Or you can visit our website:
www.sensorad.com or www.wici.com

On the website you’ll find application notes,
product manuals, engineering manuals, and
a complete listing of our products.

DR9011 / DR9021

sensoRADTM WIRELESS

DATA ACQUISITION SYSTEM

The sensoRADTM wireless system is very
simple to setup and operate. To ensure
optimal performance, please read and
carefully follow the instructions in this manual.

SYSTEM CONTENTS

Your system includes this manual, a DR9011
Wireless Transmitter and at least one DR9021
Wireless Receiver.

The only prepared cable required is the coaxial
cable that connects to the wireless product
and the antenna. All other connections are
field wiring from the plug-in terminal blocks to
the user’s input and output devices.

Antennas will be required for each product.

DESCRIPTION

The sensoRAD™ Wireless Point-to-Point
System requires only one DR9011 Transmitter
and at least one DR9021 Receiver. The
system supports an unlimited number of
receivers.

The DR9011 is an RF transmitter that will
accept both analog and digital inputs in the
form of contacts, open collector NPN
transistors, or N channel MOSFET transistors.

A 12 bit A/D converter is used to digitize the
analog data. Analog data and switch status
is then transmitted to the companion DR9021
Receivers.

The DR9021 RF Receiver receives RF signals
from the DR9011 Transmitter and reconstructs
the analog signals and switch status. The
analog signals are reconstructed as 4/20mA
outputs.

When the transmitter has a dual channel input,
the DR9021 Receiver has a 4/20mA output for
each channel. If the transmitter has a single
channel analog input, the DR9021 provides

two 4/20mA outputs proportional to the single
input.

Switch(digital) outputs are provided as
isolated open collector NPN transistors.

A DIP Switch on the DR9021 PC board allows
selection of Normal Acting or Reverse Acting
(failsafe) digital outputs. (See Figure 1)

The system can be ordered as a 900MHz,
923MHz, or 2.4GHz system. All three systems
take advantage of the unlicensed ISM
frequency bands. The radios use frequency
hopping, spread spectrum technology to
eliminate interference and to allow multiple
transmitters to operate in the same locale
without interference. Each of the three
frequency bands has 7 different user
selectable frequency hopping sequences to
allow up to 21 transmitters to work in the same
locale. The transmitter module hops through
25 channels with any 1 of 7 hop sequences
per frequency band. A DIP Switch on the PC
board is used to set the hopping sequence.

Both the DR9011 and DR9021 have 2 point
isolation between input, output and power
source, additionally, the DR9011 dual channel
DC input has individual isolation for each input
channel.

The isolation makes the product useful for
measuring input signals with high common
mode voltages and for breaking ground
connections to eliminate ground loops.

Pluggable screw terminal blocks allow easy
wiring and removal of products.

All of the DR Series of products provide
transient protection to help eliminate damage
from lightning and from other transients
created on the power and signal leads.

DR9011 Switches DR9021 Switches and Potentiometers

Figure 1

HOP SEQUENCE SETTING

To operate as a system both the DR9011 and
the DR9021 must have the same Hop Sequence
setting. To set the Hop Sequence:

1. Remove the power and all connections
from the unit.

2. Squeeze the two tabs that hold the case
front section to the rear section and pull
the case apart. The circuit board is
attached to the front section and will slide
out of the case.

3. Locate the 4 position DIP switch just
inside of the front panel ( See Figure 1).
The switches work in binary.

Switch 1 = Binary 1 (HOP 1)
Switch 2 = Binary 2 (HOP 2)
Switch 3 = Binary 4 (HOP 4)
Switch 4 = Normal / Reverse Acting
(DR9021 Only)

To set the Hop Sequence desired, close the
switches as follows:

HOP SEQUENCE CLOSE SWITCHES

0 All Switches Open
11
22
3 2, 1
43
5 3, 1
6 3, 2

Units are normally shipped from the factory
with the HOP sequence set to "0".

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INSTALLATION

The DR Series of products mount on standard
35 mm DIN rails. Install by hooking the top of the
case’s latch onto the top of the DIN rail. Then
push down on the case, letting it pivot on the
DIN rail. The bottom slide of the mount will snap
behind the rail and secure the product.

To remove, insert a screwdriver into the hole
on the metal latch on the bottom of the case,
and pull the latch down until it allows the front
of the case to be lifted up.

The enclosure depth must be deep enough to
accommodate the antenna connector and
cable. See Figure 2 for details of the case
dimensions.

Note: Correctly identify the DR9011 and
DR9021 and note power requirements before
snapping onto the DIN Rail. Once installed the
side label may not be visible.

2. Apply power to all units. Check to see that
the green RX LED is flashing steady on all
DR9021. If the RX LED does not flash or
is inconsistent then further steps are
need to obtain a reliable RF signal. Continue
to step 3.

3. If the RX LED does not flash or is
inconsistent, the antennas, cables, and
connectors for both the transmitter and
receiver may need to be adjusted,
changed or repaired.

a. Verify that all antenna cables and

connectors are continuous and not
shorted. This includes any pigtail
cables, bulkhead adapters, lightning
surge arrestors, and extension
cables.

b. Inspect the antennas for damage.

Note: Some antennas are shorted
across the center pin to shield and
some are open. Unless the antenna
configuration is known, measuring
resistances across the antenna is
not useful.

c. Verify that the antennas are mounted

and aimed correctly. Omni antennas
should be vertical and mounted
above and free of obstructions.
Yagi antennas should be pointrd at
their companion antennas with the
elements vertical. Use of
topographical maps and satellite
imaginary can be very helpful when
aiming antennas.

d. Verify that the signal path is clear.

Any obstructions in the signal’s
Fresnel zone can reduce the signal
strength. Often the signal can pass
through or around trees, building,
and machinery. All of these do
reduce the signal strength and
excessive obstruction will result in
a weak signal. The signal will not
penetrate earth. If the ground level
rises up into and obstructs the
Fresnel zone, the height of the
antennas will need to be increased.

e. Verify you have selected the proper

antenna for the application. For help
with antenna selection contact
Wilkerson Instrument Company, Inc.

A copy of our Wireless Engineering Manual
can be downloaded from www.wici.com or
www.sensorad.com or obtained from the
factory by contacting [e-mail].

RF SIGNAL LOSS

If for any reason the RF signal is lost for 2
seconds or more the analog outputs of the
DR9021 will drop to below 4mADC. The
switches will move to the failed position as
defined by the 4th DIP Switch described above.
Often applications will use one of the switch
contacts as a failed RF signal alarm or they will
monitor the analog value and alarm when the
value drops below 4mADC.

OPEN SENSOR INPUT

The DR9021 is design for an up scale burn out
if the analog inputs of the DR9011 become
open. If the input load to the DR9011 is
removed the output of the DR9021 will be
above 20mADC. Applications use this feature
to monitor the sensor status.

APPLICATIONS

The DR9011 and DR9021 have numerous
applications where an analog signal and/or an
alarm contact needs to be monitored and the
installation of signal wire between the locations
is not practical or cost prohibitive. This system
has been successfully installed in many
application where a signal needs to be
transmitted a short distance between
machinery as well as longer range application
where signals are transmitted up to 20 miles.
Visit http://www.sensorad.com or call
Wilkerson Instrument Company, Inc. for more
information on successful applications using
the sensoRad™ Wireless products.

FCC WARNING

This device complies with Part 15 of the FCC
Rules. Operation is subject to the following
two conditions (1) this device may not cause
harmful interference and (2) this device must
accept any interference received, including
interference that may cause undesired op­eration.

WARRANTY

The DR9011 and DR9021 carry a limited 5 year
warranty (1 year on the radio module). In the
event of a failure due to defective material or
workmanship, the unit will be repaired or
replaced at no charge.

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