Sensor Developments 90305B Telemetry Transmitter User Manual

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Document ID	1076536
Application ID	GxcqhPMIlJ+anNWzApWQAQ==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	77.11kB (963813 bits)
Date Submitted	2009-03-04 00:00:00
Date Available	2009-03-05 00:00:00
Creation Date	2009-03-04 15:27:11
Producing Software	Adobe Acrobat 6.0 Image Conversion Plug-in
Document Lastmod	2009-03-04 15:27:11
Document Title	Users Manual
Document Creator	Adobe Acrobat 6.0

FCC NOTICE
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
2. This device must accept any interference received, including interference that may
cause undesired operation
This device has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation This device generates, uses. and can
radiate radio frequency energy and, if installed and used in accordance with the instruction, may
cause harmful interference to radio conununications. However, there is no guarantee that
interference will not occur in the particular installation. If this device does cause harmful
interference to radio or television reception, the user is encouraged to try to correct the interference
by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the computer and receiver.
3. Connect the computer into an outlet on a circuit different from that to which the
receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
C A UTION
Any changes or modifications not expressly approved by the grantee of this device could void the
user’s authority to operate the equipment.
SPECIFICATIONS
General
Sensor input
Minimum Bridge impedance
Sensor input range
Gain . . ..
Excitation
Full Bridge Strain Gage
... ..350 Ohms
...... +/- 2mV/V to +/-10mV/V
.adjustable with external resistor
.+5VDC
Resolution. 12 bits (11 bits plus sign)
Accuracy .05% ofFuII Scale
Sample rate 1250 samples/second
Low pass filter cutoff 300Hz
Power supply input 7.5 — ZOVDC
Power supply current (w/o sensor) ............................................. 25 mA
Temperature
Operation ............................................................................................ 0 A 70 deg C
Sensor input Drifl ............................................................................... .01% per deg C
Recommended Battery
Type .............. 9VDC alkaline
Approximate battery 1 e (1000 ohm sensor) ...16 hrs.
‘
bensor
eveIopments CInc.
INNOVATIONS IN FORCE MEASUREMENT FAX:(248)391~0107
Phone; (245) 391-3000
TELEMETRY TRANSMITTER
MODEL 90305
Operators Manual
The transmitter consists of a strain gage amplifier, a 4 pole low pass butterworth filter, analog to
digital converter, control electronics, and a 900MHZ radio transmitter. Operation of the transmitter
is as follows:
1. Connect the strain gage sensor to the sensor-input pins as shown in Figure 1.
2. Select the desired channel by the proper switch combination as shown in Table I . Use
Figure 1 for a reference.
3. Select the appropriate gain selection with the switches as shown in TabIe 2. Use Figure l
for a reference. This selection sets the full scale input range of the transmitter. See the
“Selecting Gain” section on the next page for more information.
4. Connect power to the power input pins as shown in Figure 1. Note the polarity, Maximum
input voltage is 20 volts DC.
When powered up, the unit will transmit the sensor information to the receiver on the same
channel. To obtain maximum range, place the antenna far from other metal objects.
Sensor Inputs Battery Connection
1 +Excitation 8 Full bridge input it]
2 +Signal 9 Full bridge input #2
3 -Signal 10 Battery +
4 ~Excitation 11 Battery -
5 Gain resistor (external)
6 Gain resistor (external)
7 Shield
Mail, Shipping:
POEM 290 1050 W. Silver Bell Rd
Lake Orion, MI 48361-0290 http://sendev.com Orion, M148359
Figure 1 — Transmitter Connections
SELECTING GAIN
Freq.(MHz) csz CSI Cso
903.3 On On On
906.3 On On Off
r? \\ 907.8 011 Off On
909.3 On Off Off
912.3 Off On On
9153 Off 0 Off
9V 919 8 Off Off On
BATTE RY 92113 011" Off Off
L Table 1 - Channel Selections
The 90305 lransmitter comes equipped with a full adjustment range for gain No external gain
resistor is required for normal operation. There are 6 switches on the package that control 1
6 user
selectable gain settingi See Figure 1 for switch locations. Table 2 S‘lOWS the hill scale input range
of the transmitter vs. the gain switch settings. In each case, GSS must be set to ON.
Range Range
mV IV GS4 GS3 GSZ G51 G50 mV IV G54 G53 G52 G81 G80
4.1 Off Off Off Off Off 1.9 On Off Off Off Off
3.9 Off Off Off Off On 1.8 On Off Off Off On
3 .8 Off Off Off On Off 1.7 On Off Off On Off
3.7 Off Off Off On On 1.6 On Off Off On On
3 .6 Off Off On Off Off 14 On Off On Off Off
3.4 Off Off On Off On 13 On Off On Off On
313 Off Off On On Off 1.2 On Off On On Off
3.2 Off Off On On On 1.0 On Off On On On
3.1 Off On Off Off Off .9 On On Off Off Off
2.9 Off On Off Off On .8 On On Off Off On
2.8 Off On Off On Off .7 On On Off On Off
27 Off On Off On On .5 On On Off On On
2.5 Off On On Off Off .4 On On On Off Off
2.4 Off On On Off On 3 On On On Off On
2.3 Off On On On Off ,2 On On On On Off
2.1 Off On On On On Undefined On On On On On
Table 2 — Gain Switch Settings
SELECTING A GAIN RESISTOR
Sometimes there will be a need to circumvent the gain setting circuitry built into the transmitter
and install a custom gain resistor. This is done by setting gain switch GSS to the “Off’ position.
This disables the internal resistor network and allows an external resistor to be installed in its
place. The custom resistor must be soldered directly to the gain pins. See Figure 1 for the location
of the gain pins.
Select the gain resistor using the following equation;
Rg : 0501qu scale output in mV/V) /(.88 — (005 xfidl scale output in mV/V))
Example;
For a 2mV/V full-scale sensor output, using the equation above, we have...
Rg : (250x ZmV/V) / (as 4.005 x 2mV/V)) = 500/(88 . 01) = 500/87 : 575 ohms,
Choose the standard resistor value closest to the calculated Value. Do not go under the calculated
value by more than 2%, as this will cause the transmitter to overrange with a full-scale load on the
sensor. Choose good quality, ow temperature drift resistors. See Table 3 for a list of standard 1%
resistors to use for gain and the corresponding input ranges.
Resistor Full Scale Resistor Full Scale
(ohms) Input (mV/V) (ohms) Input (mV/V')
174 ,6 698 2.4
226 .8 750 2.6
287 1.0 806 2.8
340 1.2 866 3.0
402 1.4 931 3.2
464 1.6 976 3.4
523 1.8 1050 3.6
576 2.0 1100 3.8
634 2.2 1150 4.0
Table 3 — Input Ranges from Gain Resistors
All data sent from this transmitter is encoded with a checksum. This is an error detection scheme
that is used by the receiver to tell if the received data was good. When the transmitter’s battery
gets low, the transmitter will intentionally corrupt the checksum before sending it. The receiver
will continually see the transmission as in error. Replace the transmitter’s battery when this
occurs.
SERVICE WARRANTY
Sensor Developments warrants its products to be free from defects in material and workmanship
for a period of one year from shipment from our factory. In that period we will, at our option,
repair or replace a defective component or entire product which has been submitted for our
examination. This is our sole obligation. We are not responsible for any costs or liabilities arising
from but not limited to de-installing, consequent or collateral damage, delays, loss of use, re~
installing, or any others. The warranty is in effect provided the component or product is properly
used in the application for which it is intended. Products which have been modified without Sensor
Developments’ approval, on which repairs have been attempted by non-qualified persons, which
have been subjected to physical or electrical stress beyond our ratings, or which have had their
identifying marks removed or altered are not covered by this warranty.
In cases of incorporation of a product by the user in a larger system provided by a third party or
sold on to a third party, we make no warranties except those above. We assume no responsibility
for fitness for purpose in these circumstances.
Warranty returns must be authorized by us and shipped prepaid to us, Our return authorization
number must appear on the packaging and any correspondence. We will return the goods prepaid,
Products, which have been exposed to hazardous materials, will not be accepted unless they have
been properly decontaminated. Sensor Developments reserves the right to refuse any shipment
which it believes may create a physical or health hazard to our employees
Products returned out of warranty for repair are subject to a minimum inspection fee. The fee is
waived if the repair is authorized. It is also waived if the product is un-repairable and/or a
replacement is purchased.
REPAIR SERVICES
Sensor Developments’ products requiring repair should be returned freight prepaid to: Attention »
Service Department Information should be included stating what is wrong with the item(s)
returned and name of contact No item shall be returned for repair which has been exposed to
hazardous materials without suitable decontamination. Hazardous materials include, but are not
limited to: poisons, materials capable of producing toxic fumes, radioactive waste materials which
can spread viral or other diseases and materials which pose hazards by airborne ingestion, such as
asbestos. Sensor Developments reserves the right to refuse and/or return any shipment which it
believes poses any health risk to its employees. Unless the repair is covered under the terms of
Sensor Developments’ warranty, there will be a minimum inspection and evaluation fee for each
item returned. This fee may be waived if the item proves non-repairable, and a comparable
replacement is ordered
Revised: May 28, 2002

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