Huba 691 Service Manual
691
Pressure transmitter
Relative –1 to 600 bar
Absolute 0 to 16 bar
EDITION 12/2004
Huba Control
FOR FINE PRESSURE AND FLOW MEASUREMENT
HUBA-REGISTERED TRADE MARK
Technical overview
The pressure transmitter of type series 691 with
unique and for the last 10 years used in millions
of applications ceramic technology, features
calibrated and amplified sensor signals which are
available as standardized voltage or current outputs.
Various application-specific pressure and electrical connections can be provided.
Legend to cross-section drawing
1 Connection fitting
2 Seals
3 Ceramic element
4 Cover
The distinct advantages
• Very low temperature sensitivity
• High resistance to extreme temperatures
• No mechanical aging
• No mechanical creepage
Individual applications due to modular
•
system
Pressure ranges
Absolute pressure, Relative pressure (Gauge) (differential measurement of pressure relative to ambient pressure) See order code selection table
Overload
2 x Measuring range (fs)
Rupture pressure
3 x Measuring range (fs)
Accuracy
Total of linearity, hysteresis
and repeatability < +/- 0.3% fs
Zero point residual voltage < 50 mV
Zero point residual current
at version 0 – 20 mA < 150 A
Materials of housing in contact with the
medium
Ceramic / Inox 1.4305 (Ceramic / PVDF on
request)
Sealing material: optionally FPM, EPDM, NBR,
silicone according to order code selection table
Application temperature
Medium and
ambient temperature – 15 …+ 80 °C
Medium and ambient temperature – 40 °C only
with CR seal and on request
Temperature influences
TC zero point < +/- 0.03% fs/K
TC sensitivity < +/- 0.015% fs/K typ.
Load cycle
< 50 Hz
Dynamic response
Suitable for static and dynamic measurements.
Response time: < 5 ms
Pressure connections
Inside thread G 1/4
Outside thread, connection fitting sealed at front
or at back (option) 1/4-18 NPT
Weight
Inside thread G 1/4 200 g
Outside thread
G 1/8 / 7/16-20 UNF 212 g
G 1/4 / 1/4-18 NPT 245 g
G 1/2 / 1/2-14 NPT 280 g
Installation arrangement
Unrestricted
Signal Power supply
0 – 10 V 18 – 33 VDC
24 VAC +/- 15%
3 wire cable
4 – 20 mA 11 – 33 VDC
2-wire cable
0 – 5 Volt 11 – 33 VDC
24 VAC +/- 15%
3-wire cable
Short circuit-proof and protected against polarity reversal. Each connection against other with
max. +/- supply voltage. Frequency output on
request. Switching output, see type 615.
Load
0 – 10 V > 10 k Ohm
4 – 20 mA < [Ohm]
Load
With max. signal output
0 – 10 V < 5 mA
4 – 20 mA < 20 mA
Electrical connections / Protection standard
Cable 1.5 meters, IP 67 or IP 65
Round plug connector DIN 41524, 3-pole, IP 65
Connector DIN EN 175301-803-A, IP 65
Electromagnetic compatibility
EMC-Behavior see on the back. «Germanischer
Lloyd» certification on request.
Calibration by customer
Adjustable versions (zero point/slope approx.
+/- 10%) only with IP versions.
supply voltage – 11 V
0.02 A
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