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gle/SG-IsoCond01


• Isolated signal conditioner for strain-gage bridges, like

  load cells and pressure transducers (full-bridge).
• High stable 10V strain gage excitation.
• 0-5V or 4-20mA analog output.

• Full-scale sensitivities of 1mV/V, 2mV/V, 3mV/V and 4mV/V.

 

• 1500Vrms input/output isolation.
• Analog output isolated from power supply (350Vrms).
• >100dB CMRR.
• IP65 housing.

gle/SG-IsoCond-01 is a highly accurate and cost-effective signal conditioner for single-channel strain gages and Wheatstone bridges in general like load cells and pressure transducers. The module accepts 350 Ohm (or greater) full-bridge gages providing the appropriate bridge excitation, signal filtering and conversion to a high level voltage output. Moreover gle/SG-IsoCond-01 has been designed to perform reliable internal isolation: voltages up to 2100 VDC (equivalent to 1500 Vrms) can drop between the input and the output stages of the conditioner (see the block diagram reported below).

Special protection circuits are also present on the signal input in order to prevent against pulsed over-voltages, undesired spikes and RF interferences. The same section also permits, via a trim pot, the zero fine adjustment and hence to offset eventual bridge imbalances.

An extremely stable 10 V source provides the needed voltage excitation for the transducers. This section comprises a series-type voltage regulator that outputs a high-stability voltage reference. Besides a screwdriver adjustable trim pot enables fine tuning around 10 V.

The amplification stage includes a precision monolithic differential amplifier. By means of dip-switches it is possible to select one of four pre-configured gain values (standard sensitivities corresponds to 1, 2, 3 and 4 mV/V). Isolation between the input and the output stage is provided by an isolation module downstream the amplifier (Isolation barrier in the block diagram) and by a high isolation DC/DC converter.

Eventual spurious signals can be filtered out thorough a 4th order low-pass active filter (standard cut-off frequency is equal to 10Hz), while module output is either voltage (0¸5 V) or current (4¸20 mA). For both these output options zero and gain fine adjustments are available using on-board potentiometers. Isolation is guaranteed also between the output stage and the primary voltage supply, assuring protection up 500 VDC (350 Vrms).

Output signals and power lines are connected to the unit by a 7-pins rugged bayonet connector, while input signals and transducer excitation enter in the module via gland and they are secured by means of a removable screw connector. gle/SG-IsoCond-01 housing is made of a rugged IP65 metallic case enabling usage even in extreme environmental operating conditions.

 

Block Diagram



Technical Specifications- gle/SG-IsoCond01

Input channels

1

Transducer type

Full bridge sensor

Bridge load resistance

³ 350 W

Input impedance

> 10 MW 

Common mode rejection ratio CMMR

> 100 dB

Input over-voltage

± 40 V (not destructive)

Gain selectable values

500, 250, 166.7 and 125 (corresponded to 1mV/V, 2mV/V, 3mV/V and 4mV/V)*

Gain selection

Through dip-switches

Stability

± 50 ppm/°C rto; ±1 ppm/°C rti

Bridge balance

Via screwdriver adjustable trim pot

Transducer excitation

10 Vcc; high stability (8.5 ppm/°C); 2 wires with fine tuning

Output signal

        1. Voltage: 0¸5V

        2. Current: 4¸20 mA

Output type selection

Through dip-switches

Output filter

4th order active low-pass; cut-off frequency = 10 Hz

Maximum loop load resistance (4¸20 mA output)

450 W (without auxiliary power source)

Adjustability

±5% Zero and span

Accuracy (@ 25°C)

0.05% (linearity, hysteresis, repeatability and sensor excitation included)

Input/Output isolation

1500 Vrms

Output/Power supply isolation

350 Vrms

Isolation Mode Rejection IMR

> 100 dB @ 50Hz

Power supply

18 ¸ 36 VDC (Current absorption @ 100 mA @ 24 VDC)

Transducer connector

Removable screw terminals (cable enter in the case via gland).

Primary voltage supply and output connector

7-pins bayonet

Operative temperature

-40 ¸ +80 °C

Housing

Metallic IP65 case

Dimensions

80 x 125 x 57 [mm] (glands excluded)

* Other gain options are available on request

Due to continuous developments, specifications are subject to change without prior notice. This product is not intended for applications whose its failure to perform can be expected to cause damages to properties and/or persons and/or injury to human life.

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PDF

gle/SG-IsoCond01 datasheet