S7 In-Line Signal Conditioning Amplifiers

LVDT amplifier
Strain gauge transducer amplifier
High environmental protection
Limit trips
Voltage / 4-20mA output
Simple trimpot controls


 Signal conditioning is required where the output of a transducer needs to be boosted or changed into a form suitable for the monitor or logging device which will be used. These amplifiers are suitable for LVDT transducers, strain gauge sensors and some internally amplified transducers.

Our S7 amplifiers are specifically designed to be installed close to the transducer so that the signal can be boosted as soon as possible. The S7 signal conditioning units are mounted in a die-cast aluminium housing and have a good level of environmental protection and screening from electrical noise.

A very wide range of gain adjustment ensures that our amplifiers are compatible with the vast majority of LVDT and strain gauge sensors available from any manufacturer.

There are several versions with different input, output and transducer compatibility.

S7AC dc powered LVDT transducer amplifier.    S7AC MOD 10+ technical manual (69kb)

A = 3.86''   D = 1.42''
B = 3.39'' E = 1.42''
C = 2.52'' F = 0.16''
Drawing shows base of box
Compatible with Any standard RDP LVDT
LIN & PY When fitted with two 1k Ohm bridge completion resistors ( Does not provide analogue voltage linearisation for PY)
Most LVDTs from any manufacturer
Supply voltage (single, must be floating) 12V to 36V dc, 50mA Output ripple 5mV peak-to-peak typical / 10uA peak-to-peak typical
Supply voltage (dual) ±6V to ±18V dc, 50mA Input impedance ±130k Ohms
Transducer excitation 1V, 5kHz (1kHz to 10kHz with component change), 25mA Temperature coefficient (zero) ±0.003% F.S. /°F minimum
Output details ±4V to ±10V (may be affected by supply voltage) /
4-20mA (loop resistance 100 Ohms to 550 Ohms)		 Temperature coefficient (span) ±0.006% F.S. /°F minimum
Amplifier gain range 0.07 to 500 Approximate zero adjustment range ±5V
Signal input range 30mV to 4V Operating temperature range 14°F to 140°F
Linearity error ±0.1% F.S. Total weight 9.2oz
Electrical output bandwidth 0 to 500Hz Cable gland cable size 0.12'' to 0.26''

S7TW 4-20mA loop powered LVDT transducer amplifier.    S7TW technical manual (143kb)

A = 4.92''   D = 2.05''
B = 4.45'' E = 2.24''
C = 3.15'' F = 0.16''
Drawing shows base of box
Compatible with All standard RDP LVDT transducers except the following which require a free of charge modification called TM0202
D5/25, ACT2000, ACT2000A, ACT2000C, ACT4000, ACT4000C, ACT15000C, ACT18500C
Most LVDTs from any manufacturer
Supply voltage 12V to 36V dc Output ripple 50uApeak-to-peak (15uApeak-to-peak with filter turned on)
LVDT minimum input impedance 130 Ohms Input impedance 100k Ohms
Transducer excitation 0.5V (4mA), 5kHz Temperature coefficient (zero) ±0.003% F.S. /°F (typical)
Output details 4-20mA (loop resistance 50 Ohms to 1.2k Ohms maximum) Temperature coefficient (span) ±0.008% F.S. /°F (typical)
Amplifier gain range 2.5 to 333 Approximate zero adjustment range ±8mA
Signal input range 30mV to 4V Operating temperature range -4°F to 185°F maximum
Linearity error ±0.05% F.S. Total weight 1.2lb
Electrical output bandwidth 0 to 250Hz (25Hz with filter turned on) Cable gland cable size 0.12'' to 0.26''

S7M 115/230V ac powered LVDT transducer amplifier.    S7M technical manual (177kb)

A = 8.66''   D = 3.23''
B = 8.03'' E = 3.19''
C = 4.72'' F = 0.24''
Drawing shows base of box
Compatible with Any standard RDP LVDT
LIN & PY When fitted with two 1k Ohm bridge completion resistors ( Does not provide analogue voltage linearisation for PY)
Most LVDTs from any manufacturer
Supply voltage 230V or 115V ac, 2.5VA, 50/60Hz Input impedance ±100k Ohms
Transducer excitation 5V, 5kHz (1kHz to 10kHz with component change), 100mA Temperature coefficient (zero) ±0.001% F.S. /°F typical
Output details ±10V / 4-20mA (loop resistance 0 Ohms to 600 Ohms) Temperature coefficient (span) ±0.002% F.S. /°F (typical)
Amplifier gain range 0.15 to 200 Approximate zero adjustment range ±10V
Signal input range 20mV (minimum) to 20V Operating temperature range 14°F to 122°F
Linearity error ±0.1% F.S. maximum Total weight 4.0lb
Electrical output bandwidth 0 to 500Hz Cable gland cable size (x2) 0.12'' to 0.24''
Output ripple 5mV peak-to-peak typical Cable gland cable size (x1) 0.20'' to 0.39''

S7DC dc powered strain gauge transducer amplifier.    S7DC technical manual (138kb)

A = 3.86''   D = 1.42''
B = 3.39'' E = 1.42''
C = 2.52'' F = 0.16''
Drawing shows base of box
Compatible with Most full bridge strain gauge transducers
Supply voltage (single, must be floating) 10V to 36V dc, 30mA (plus transducer and output load) Output ripple 10mV / 30uA
Supply voltage (dual) ±5V to ±18V dc, 30mA (plus transducer and output load) Input impedance >10M Ohms
Transducer excitation 3V to 10V , 100mA Temperature coefficient (zero) ±0.001% F.S. /°F (typical)
Output details ±3V to ±10V / 4-20mA (loop resistance 0 Ohms to 800 Ohms) (may be affected by supply voltage) Temperature coefficient (span) ±0.002% F.S. /°F (typical)
Amplifier gain range 1 to 1250 Approximate zero adjustment range ±2V
Signal input range 4mV to 10V Operating temperature range -40°F to 185°F maximum
Linearity error ±0.02% F.S. Total weight 9oz
Electrical output bandwidth 0 to 5kHz (20Hz with filter turned on) Cable gland cable size 0.12'' to 0.26''

S7MZ 115/230V ac powered strain gauge transducer amplifier.    S7MZ technical manual (191kb)

A = 8.66''   D = 3.23''
B = 8.03'' E = 3.19''
C = 4.72'' F = 0.24''
Drawing shows base of box
Compatible with Most full bridge strain gauge transducers
Supply voltage 230V or 115V ac, 2.5VA, 50/60Hz Input impedance ±1G Ohms
Transducer excitation 5V, 5kHz (1kHz to 10kHz with component change), 100mA Temperature coefficient (zero) ±0.001% F.S. /°F typical
Output details ±10V / 4-20mA (loop resistance 0 Ohms to 600 Ohms) Temperature coefficient (span) ±0.002% F.S. /°F (typical)
Amplifier gain range 5 to 7000 Approximate zero adjustment range ±10V
Signal input range 1.5mV to 600mv Operating temperature range 14°F to 122°F
Linearity error ±0.1% F.S. Total weight 4.0lb
Electrical output bandwidth 0 to 500Hz Cable gland cable size (x2) 0.12'' to 0.24''
Output ripple 5mV Cable gland cable size (x1) 0.20'' to 0.39''

S7CT Amplifier for use with RDP capacitive transducers.    S7CT technical manual (180kb)

A = 5.91''   D = 1.42''
B = 5.43'' E = 1.34''
C = 2.52'' F = 0.16''
Drawing shows base of box
Compatible with Sensagap, RCDT, & MLP
MCL (S7CT+PD1499)
Supply voltage
(specify with order)		 S7CT = 115/230Vac (±20%) , 6VA
S7CTDC = 5/12/24Vdc (±10%) , 3VA		 Output ripple 5mV peak-to-peak typical
Transducer excitation 15V, 12mA Input impedance ±200k ohms
Output details ±10V / 4-20mA (loop resistance 0 Ohms to 400 Ohms) Temperature coefficient (zero) ±0.002% F.S. /°F (typical)
Voltage free relay contacts 2 Temperature coefficient (span) ±0.002% F.S. /°F (typical)
Amplifier gain range 1 to 35 Approximate zero adjustment range ±4V
Signal input range 300mV to 10V Operating temperature range 14°F to 131°F
Linearity error ±0.02% F.S. typical Total weight 1.2lb
Electrical output bandwidth (0 to 600Hz) to (0 to 60Hz) depending on gain Cable gland cable size 0.12'' to 0.26''

All dimensions and specifications are nominal.www.rdpe.com/us/s7.htm20060906
Due to our policy of on-going development, specifications may change without notice. Any modification may affect some or all of the specifications for our equipment.
 

RDP Electrosense
2216 Pottstown Pike
Pottstown, PA 19465
USA
Tel: 610-469-0850
Tel: 800-334-5838
Fax: 610-469-0852
Email: info@rdpe.com
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