Keller M5 Specifications
Ultra-Fast MiniatUre PressUre transdUcer
bandwidth 50 khz / resistant UP to 200 °c
The piezoresistive pressure transducers Series M5 are ideal, thanks to the M5 ne thread, for
taking measurements at close proximity in places where access is a problem and in very thin
pipes – exactly the kinds of conditions associated with engine test benches. The front-ush
design prevents gas bubbles interfering with uid measurements and supports measurements
up to 200 °C without a cooling adapter. The extreme dynamic range of 0…50 kHz makes it
possible to record very fast pulsations just as reliably as those associated with static pressure
values. A vibration-resistant Teon FEP cable (IP67) ensures the 80 mV output signal is routed
securely out of the hot environment and then onwards for processing.
Sensor technology
The Series M5 sensor incorporates a stable silicon sensor which is backside-soldered directly
to a supporting element designed for excellent uid dynamics. This construction eliminates the
disadvantages of sealants, adhesives, separating membranes or capillary tubes in high tem-
perature environments. The practically-ush connection to the measurement media is critical
to the excellent dynamic range of 0…50 kHz. The micromechanical design delivers absolute
measuring ranges of 3, 10 and 30 bar, overpressure protection of up to 5 times measuring range
and effective isolation of mounting forces, and a very low dead volume.
Conditions of use
Thanks to the materials used in the pressure connection (silicon oxide, stainless steel, and
gold), the pressure transducers in the M5 series offer excellent media compatibility. They are
designed for operating temperatures between -50 °C and +180 °C and come with a typical out-
put signal range of 80 mV (based on a 1 mA supply) and an individual calibration certicate. The
unit which incorporates a remote measurement amplier is known as the Series M5 HB (see the
data sheet) and can achieve a total error band of ± 1 %FS for the operating temperature range.
Performance characteristics
• Sensor head capable of exposure to 200 °C
• Broad compensated temperature range, with a choice of either -20…125 °C or -40…180 °C
• Excellent dynamic response, up to 50 kHz (pulsation measurements)
• Insensitive to structure-borne vibration
• Extremely compact design, pressure connection: M5 x 0,5 ne thread
• Teon FEP cable with IP67 ferrule, suitable for use on test benches
• Pressure ranges of 3 bar, 10 bar and 30 bar (absolute)
series M5
1:1
KELLER AG für Druckmesstechnik
CH-8404 Winterthur
+41 52 235 25 25
info@keller-druck.com
1,5 m
Measurement Bridge
Comments
- The R1 or R2 resistor provides pre-compensation for the zero-point variation
with temperature. The recommended value can be found in the calibration sheet.
- The shield is connected to the pressure transducer housing.
- Recommended tightening torque 1,5…2,5 Nm
KELLER Ges. für Druckmesstechnik mbH
D-79798 Jestetten
+49 7745 9214 0
eurocenter@keller-druck.com
KELLER America
Newport News, Virginia
1 877 253 5537
sales@kelleramerica.com
R1
R2
ELECTRICAL CONNECTIONS
+IN / TOB (black)
+OUT (red)
-
OUT (blue)
-
IN (white)
Shield (wire mesh)
Edition 10/2015
Subject to alterations
Companies approved to ISO 9001
www.keller-druck.com
Specications
Absolute pressure ranges
PAA 3 10 30 bar
Overpressure / burst pressure 15 50 90 bar
Typical sensitivity 30 8 3.2 mV/bar at 1 mA
PAA: Absolute pressure. Zero at vacuum.
Calibrated Temperature Range (choice of) -20…125 °C or -40…180 °C
Operating Temperature Range -50…180 °C
Symbol
Bridge resistance
Temperature coefcients for
Supply (constant current source) IB 0,1 1,0 mA
Linearity (best tted straight line) Lin ± 0,2 ± 0,3 %FS
Zero point
Temperature coefcient for
Temperature coefcient for
Pressure hysteresis
Temperature hysteresis
1)
Bridge resistance as a function of temperature: RB(T) = RB . [1 + α_RB
2)
Signals at a constant excitation current of 1,0 mA
2)
Electrical Connections
bridge resistance
zero point
sensitivity TCsens
4 open exible wire ends (closed measurement bridge)
1)
2)
RB 25 °C 2,6 3,3 4 kΩ
α_RB
β_RB
NP 25 °C -25
TCzero -40 to +180 °C
.
(T-25 °C) + β_RB
1,5 m FEP cable with Ø 2,9 mm shield
Insulation > 10 MΩ @ 300 VDC
Pressure Connection Metric ne thread: M5 x 0,5
Materials in Contact with Media Stainless steel AISI 316L (DIN 1.4404 / 1.4435), silicon, gold,
external copper seal
Media Compatibility Oil, fuels (diesel, petrol, etc.), gases, coolants, etc.
Protection IP67
Options
• Other pressure connections via thread adapter
Conditions Min. Typ. Max. Unit
-40 to +180 °C
-40 to +25 °C
25 to 180 °C
-40 to +180 °C 0,2 %FS
.
(T-25 °C)2]
2,0
3
0,0 0,05 %FS
2,3
5
-5
-0,05
-0,01
0,06
2,7
8
+15 mV
Each sensor is
measured as a
function of pressure
and temperature.
The characteristics
recorded are enclosed
with the transducers in
a calibration sheet.
• Other compensated temperature ranges
10-3/K
10-6/K
mV/K
%/K
2
Typical characteristic curve for temperature coefcients (normalised at 25°C)
12
10
8
6
4
2
0
TCzero [mV] @ 1 mA
-2
-4
-60 -40 -20 0 20 40 60 80 100 120 140 160 180 200
KELLER AG für Druckmesstechnik
CH-8404 Winterthur
+41 52 235 25 25
info@keller-druck.com
KELLER Ges. für Druckmesstechnik mbH
D-79798 Jestetten
+49 7745 9214 0
eurocenter@keller-druck.com
TCzero
TCsens
Temperature [°C]
KELLER America
Newport News, Virginia
1 877 253 5537
sales@kelleramerica.com
12
10
8
6
4
2
TCsens [%]
0
-2
-4
Edition 10/2015
Subject to alterations
Companies approved to ISO 9001
www.keller-druck.com
Loading...