AST BA 627 User manual

Technical changes reserved. 08/2018 Page 1 of 8
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Strain Gauge Measuring Amplifier BA 627
Original of the
Manual
Table of contents
1.Safety precautions ........................................................................................................................ 2
1.1.Field of application ................................................................................................................... 2
1.2.Installation ................................................................................................................................ 2
1.3.Maintenance ............................................................................................................................. 2
1.4.Factory setting .......................................................................................................................... 2
2.Operation ........................................................................................................................................ 3
2.1.Overview operating elements BA 627 ...................................................................................... 3
2.2.Sensitivity (S1) ......................................................................................................................... 3
2.3.Signal output (S2, S4, S5) ........................................................................................................ 3
2.4.Zero alignment (Zero >0<) ....................................................................................................... 4
2.5.Zero range (S3-2) ..................................................................................................................... 4
2.6.Amplification (Gain fine) ........................................................................................................... 4
2.7.Cut-off-frequency (S3-1) .......................................................................................................... 4
2.8.Test input ................................................................................................................................. 4
3.Specifications ................................................................................................................................ 5
3.1.General technical data ............................................................................................................. 5
3.2.Connections ............................................................................................................................. 6
3.3.Dimensions .............................................................................................................................. 7
4.EC Declaration of Conformity ....................................................................................................... 8
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
Marschnerstraße 26 01307 Dresden
Telefon [phone] Telefax (03 51) 44 55 555
www.ast.de

Manual BA 627
Page 2 of 8 Technical changes reserved. 08/2018
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
1. Safety precautions
In this operating manual, the installation, putting into operation and the operation itself of the
Strain Gauge Bridge Amplifier BA 627 is described. It is assumed that all measures are taken
by qualified staff only who have adequate knowledge in the fields of measuring and control
engineering.
ATTENTION! Any non-compliance with these safety precautions may result in
severe damage to property and health.
1.1. Field of application
The Strain Gauge Bridge Amplifier BA 627 has been designed to the purpose of amplifying the
output signals of sensors with metal-foil strain gauges, preferably force transducers and
transform them into standard signals. Any other application is regarded contrary to the
intended purpose. The manufacturer does not accept any liability for damages resulting from
such inappropriate usage. In this case it is the user alone who has to bear the risk.
1.2. Installation
The unit must be installed and connected in compliance with the current DIN- and VDE-
standards. Supply cables and signal lines shall be installed so that interference signals such as
electrical interference do not have any adverse effects on the function of the equipment.
1.3. Maintenance
The device does not contain any components that require maintenance. Repairs shall be
carried out by the manufacturer only.
1.4. Factory setting
The amplifier BA 627 is supplied with the following settings.
Input signal: 1mV/V
Zero point: 0,15mV/V
Output signal: ±10V
Filter: 10kHz
NOTE: After reset to factory settings, the amplifier has to be newly adjusted to the
sensor!

Manual BA 627
Technical changes reserved. 08/2018 Page 3 of 8
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
2. Operation
2.1. Overview operating elements BA 627
2.2. Sensitivity (S1)
Set the DIP-switches according of Table 1 to "ON" to select the input sensitivity (mV/V)
DIP-Switch ON none 1 2 3 4 5 6
Sensitivity (mV/V) 3,0 2,0 1,4 1,0 0,7 0,5 0,35
Table 1
2.3. Signal output (S2, S4, S5)
Set the DIP-switches according of Table 2 to "ON" to select the output signal.
Output S2-1 S2-2 S2-3 S2-4 S2-5 S4 S5
4 ... 12 ... 20mA ON ON Current Current
0 ... 10 ... 20mA ON ON Current Current
0 ... 5 ... 10V ON ON Voltage Voltage
0 ... 20mA ON ON Current Current
4 ... 20mA ON ON Current Current
-5V ... +5V ON Voltage Voltage
-10V ... +10V ON ON Voltage Voltage
Table 2
ATTENTION! Check the right positions of DIP-switches S4 and S5!
S3
S3.1: cut-off-frequency
S3.2: Zero range
S2
Adjustment output signal
(Example: (-10V…+10V)
S4 and S5
Setting output signal
(Voltage or Current)
S1
Setting Sensitivity
0,35mV/V to 3mV/V
(Example: 1mV/V)
R31 Zero >0<
Fine adjustment zero
point
R34 Gain fine
Fine adjustment gain
Test input
(4...12...20)mA
(0...10...20)mA
(0...5...10)V

Manual BA 627
Page 4 of 8 Technical changes reserved. 08/2018
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
2.4. Zero alignment (Zero >0<)
Use the R31 Zero >0< potentiometer of the measuring amplifier to align zero.
2.5. Zero range (S3-2)
Select the range of the zero point 0,35 mV/V or 0,15 mV/V with the DIP-switch S3-2.(see
too 2.4).
NOTE With the zero range 0,15 mV/V its possible to adjust the zero point more
exactly.
2.6. Amplification (Gain fine)
Use the R34 Gain fine potentiometer of the measuring amplifier to align output signal. The
adjustment range is 25 %.
Depending on the setting the following range are possible S1 (see too 2.2).
Sensitivity (S1) (mV/V) 0,35 0,5 0,7 1,0 1,4 2,0 3,0
Min (mV/V) 0,28 0,4 0,56 0,8 1,12 1,6 2,4
Max (mV/V) 0,42 0,6 0,84 1,2 1,68 2,4 3,6
NOTE Check the zero point after changing of amplification.
2.7. Cut-off-frequency (S3-1)
Select the cut-off-frequency 10 kHz or 70 Hz with the DIP-switch S3-1.
2.8. Test input
If you connect the test input Test with +24V then you create an offset of 0.5mV/V at a
350 Ohm strain gauge bridge.
The recorded value can be used for checking the measuring device.

Manual BA 627
Technical changes reserved. 08/2018 Page 5 of 8
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
3. Specifications
3.1. General technical data
Accuracy Class % 0.2
Input signal range (+Si/-Si)
Bridge resistance of the strain gauge bridge
Excitation voltage (+Ex/-Ex)
Fine adjustment (input signal range)
mV/V
Ω
VDC
%
0.28 ... 3.6 (4-wire technology)
350 ... 1000
10
approx. ± 25
Output Signal
Current output
Voltage Output
Zero adjustment range
Limiting frequency (-3dB)
Temperatur effect on zero at 2mV/V
Temperatur effect on zero at 1mV/V
Temperatur effect on amplification at 2mV/V
Max. noise output: (-10 ... 0 ... +10V)
Max. noise output: (0/4 ... 20)mA
mA
V
mV/V
Hz
%/10K
%/10K
%/10K
mV
µA
0/4 ... +20 ; 10 ±10; 12 ±8 for RL ≤ 250Ω
-10 ... +10; -5 ... +5; 5 ±5 for RL ≥ 10kΩ
±0.35 or ±0.15 (DIL-Switch)
10.000 or 70 (DIL-Switch)
≤0.05
0.1
≤0.07
≤10
≤50
Test-signal input
Bridge imbalance when UB = 24V mV/V approx. +0.5 (for 350 Ω full brigde)
Power supply (UB)
Nominal voltage
Voltage range
Current consumption (at 350Ω full bridge )
VDC
VDC
mA
24
19 ... 28
ca. 44 (plus output current)
Environmental conditions
Operating temperature range
Strorage temperature range
°C
°C
-25 ... +60
-40 ... +70
Construction
Housing
Weight
Dimensions (W x H x T)
 BA627-ST
 BA627-KL
terminal blocks, wire size (BA627-KL)
Environmental protection (EN 60529/DIN 40050-9)
Kg
mm
mm
mm²
Aluminium
0,2
64 x 58 x 34I
125 x 80 x 57
0,14 … 1,5
P 65

Manual BA 627
Page 6 of 8 Technical changes reserved. 08/2018
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
3.2. Connections
Installation recommendations:
- Use shielded cables.
- Connect the housing of the connector with shield
S
tromversorgung
/
supply voltage
Speisespannung/
e
xcitation voltage
2.Stabilisierung/
stabilization
1.Stabilisierung/
stabilization
Messsignal/
signal input
Ausgang/
output
Verstärkung/
amplification
Nullpunkt/
zero 4,7n/1kV
2,2M
Ω
X9 (UB)
(+EX) X2
(+SI) X5
(-SI) X3
(-EX) X4
X8 (GND)
X6 (OUT+)
X7 (OUT-)
X1 (Test)
R 200test K Ω
Ø
V
Figure 1: Wiring diagram
1
2
3
Socket Plu
g
4
51
2
3
4
5
6
-EX
+EX +SI
-SI GN
D
UB
T
est
OUT+
OUT-
Figure 2: connection BA 627-ST
Figure 3: connection BA 627-KL

Manual BA 627
Technical changes reserved. 08/2018 Page 7 of 8
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
3.3. Dimensions
e
xcitation voltage / signal input
sensor
power supply / output / test
amplifier
2 cable glands M16x1,5
Cable diameter: 5 ... 10 mm
(when using the
incision sealing rings 3 ... 5,5mm)
125
80
ca. 57
52
113
5,2
10
8,5
1
2
3
4
51
2
3
4
5
6
-EX
+EX +SI
-SI GND
UB
Test
OUT+
OUT-
6-pin flange socket
excitation voltage / signal input
sensor
5-pin. flange plug
power supply/ output / test
amplifier
58
64
ca. 36
5,5
4,8
8
46
36
Figure 4 - Dimensions

Manual BA 627
Page 8 of 8 Technical changes reserved. 08/2018
A.S.T. - Angewandte System Technik GmbH, Mess- und Regeltechnik
4. EC Declaration of Conformity