Pressure Systems, Inc.
A Weston Company of The Roxboro Group PLC
34 Research Drive
Hampton, VA 23666
USA
Phone: (757) 865-1243
Toll Free: 800-328-3665
Fax: (757) 865-8744
E-mail: sales@psih.com
Web: PressureSystems.com
Updates: PressureSystems.com/updates.html
Resource Center: LEVELandPRESSURE.com
PSI Ltd.
124, Victoria Road
Farnborough, Hants
GU14 7PW
United Kingdom
Phone: +44 1252 510000
Fax: +44 1252 510099
E-mail: psi@westonaero.com
Quartzonix™ Pressure Standard Series 970
Intelligent
Pressure Standard
ISO-9001 Certified
FEATURES
!Ranges: Barometric and
0-15 through 0-500 psia
(0-115 kPa through 0-3333 kPa)
!Better than ±0.01% FS Accuracy
!Long term stability better than 0.01% FS
per 6 months
!RS-485 interface
!Pressure output in choice of engineering
units
!Available with Oil-filled Capillary Tube for
Water Level Measurement
APPLICATIONS
!Meteorological and barometric reference
!Low cost, high accuracy pressure
standard
!Pressure calibration equipment
!Storage tank/liquid level determination
Series 970 Intelligent Quartzonix™ Pressure Standards incorporate proven high accuracy vibrating quartz
beam technology with low power miniature digital electronics to achieve a fully compensated 0.01% FS pressure
measurement. Quartzonix™ pressure standards use a patented monolithic quartz structure and vibrating beam
to measure pressure-induced stress. The beam’s frequency of vibration changes by pressure induced stress
that is applied to the beam via a miniature metal bellows. The bellows isolates the quartz sensing element from
the applied gas, thereby making the sensor insensitive to gas density. The Intelligent Quartzonix™ has a
resolution of 0.001% FS, and drift rates of less than 0.01% FS over a 6-month period.
The Series 970 uses a multi drop, 9600 baud ASCII character RS-485 type interface, allowing a network of
up to 31 transducers on the same bus. The output pressure measurement is user programmable for both the
pressure units and update rate. The update rate is capable of 9 readings per second. The extremely low power
consumption design with a programmable sleep mode makes the Intelligent Quartzonix™ ideal for remote
battery powered applications.
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Series 970 Specifications
Parameter 970 Units Comments
PNEUMATICS
Pressure Ranges 11-16 (76-110)
15 (105)
23 (160)
30 (210)
45 (310)
65 (450)
100 (690)
200 (1380)
300 (2070)
500 (3400)
psia (kPa) Barometric only
Proof Pressure11.5 x FS
Burst Pressure22.0 x FS
Pressure Media Media compatible with 316SS
nickel and solder
Pressure Fitting c" compression
PERFORMANCE
Resolution / Repeatability ±0.001 % FS
Update Rate 9updates/sec User programmable
Static Accuracy3±0.01 % FS
Maximum Deviation over
Temperature ±0.015 % FS over specified temperature range
Thermal Hysteresis4±0.005 % FS over specified temperature range
Long Term Drift ±0.01 % FS 6 months, maximum
ELECTRICAL
Input Voltage 5 to 12 VDC Nominal 7.0 mA
Electrical Connection 6 pin circular Bendix intermateability dimensions in
accordance with MIL-C-26482 (Ref
MS3113)
Turn on Time 300 m sec
ENVIRONMENTAL / PHYSICAL
Calibrated Temp Range 0 to 60 (-20 to 70 optional) ºC
Acceleration Sensitivity ±0.004 %FS/G worst axis
Vibration Sensitivity ±0.001 %FS/G 20G peak, 10 Hz - 2 kHz
Dimensions 4.25 x 1.25 dia (10.8 x 3.18 dia) inches (cm)
Maximum Shock 200 G/10mS ½ sine
Weight 8.3 (235) oz (gms)
Notes:
1Maximum applied pressure without causing a calibration shift.
2Maximum applied pressure without causing permanent damage to quartz sensing element.
3Calibration conformance to a primary pressure standard after calibration.
4Maximum error at 25ºC after exercising 970 to either operating temperature extreme.
Specifications subject to change without notice.
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Operational Features Series 970
Operation Command String Notes
USER CONFIGURATION
Set pressure units $<node add.>SU n<CR> where n=1,2,3,or 4 for psia, kPa, hPa, inHg
Save defaults $<node add.>SD<CR> Saves users defined settings
Clear defaults $<node add.>SC<CR> Restores factory settings
Recalibration, zero offset only $<node add.>CS<applied
pressure>
<CR>
Adjust for zero drift
Recalibration, offset and span $<node add.>CL<low
pressure><CR>
$<node add.>CH<high
pressure><CR>
Two point offset and span adjustment
Clear recalibration $<node add.>CC<CR> Restores factory set calibration
IDENTITY
Ask for type and pressure range $<node add.>TT<CR> Returns Model, range and firmware version
Ask for serial number $<node add.>TS<CR> Returns S/N, sensor no. calibration number
Status request $<node add.>ST<CR> Returns system status and details of any sub-system
faults
MEASUREMENT
Single pressure reading $<node add.>MR<CR> Returns a single pressure reading
Continuous pressure reading $<node add.>MC<CR> Returns a pressure reading stream
Stop cont. pressure reading <CR><LF> Stops pressure reading stream
Request pressure units $<node add.>MU<CR> Returns the set pressure unit
Temperature measurement $<node add.>MT<CR> Returns internal temperature
Go into low power (LP) mode $<node add.>LP<CR> Shuts down sensor
Restore normal operation Any above command Wakes up unit from LP mode
WARNING MESSAGES
The 970 will report a warning if it is being operated outside of its normal pressure or temperature range. This is transmitted as an
additional string after a single or continuous pressure reading.
PLIM Operation is outside calibrated pressure range and will be in error
RCAL Operation is close to, or exceeding derangement pressure limit
TLIM Operation is outside calibrated temperature range and will be in error
FAIL Fault in the system.
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Series 970 Ordering/Part Number Information
No.0301
Ordering Information:
970A-AAAABCDEFF Model 970 Intelligent Pressure Standard, ±0.01% FS Accuracy
AAAA = Pressure Range
BARO, 11-16 psia 0045, 45 psia 0300, 300 psia
0015, 15 psia 0065, 65 psia 0500, 500 psia
0023, 23 psia 0100, 100 psia
0030, 30 psia 0200, 200 psia
B = Pressure Fitting
1, c” compression fitting
C = Electrical Termination
1, 6 pin circular
D = Pressure Calibration
1, Standard
E = Calibrated Temperature Range
1, 0 to 60ºC
2, -20 to 70ºC
FF = Specials
00, Standard
10, Oil-filled capillary tube
