Description
The EMMA is a strain gauge amplifier with IO-Link for one strain gauge full bridge. It is meant for force and pressure measurement wherever the reading should reach the controller over IO-Link instead of an analogue chain.
The bridge is supplied with 3 V DC and must have at least 350 Ω; two full bridges of 700 Ω each can be run in parallel. The measuring range is freely adjustable within −32000 … +32000, the resolution is 16 bit, the accuracy 0.05 % of range plus sensor error, and the response time 20 ms. Range, switch-off threshold, smoothing (0 … 60 s), pre-filter and auto-zero are set over IO-Link. You choose the force direction (tension, compression or tension/compression) as a variant; we set it before shipping.
Together with the reading, the EMMA reports its head temperature and five status bits: threshold reached, signal below −0.5, sensor loaded above 100 %, head temperature above 85 °C and service recommended. The switch-off threshold only sets the status bit; the amplifier itself never switches off. In the device it records a load spectrum, the operating hours per load band from below 0 % to above 100 % of the observation range, and in addition the operating hours per head temperature. Over IO-Link it can be read at any time how long the measuring point has worked in which load band; a service interval of 5 to 87,600 operating hours can be set.
The PBT GF30 housing measures 72 × 28 × 35 mm (about 95 mm with the M12 connectors), weighs 60 g and is fixed with four Ø 4.6 mm holes in any orientation. The boards are fully potted and the protection rating is at least IP65. A 2 m cable with a 5-pin M12 socket leads to the sensor, and a 4-pin M12 plug connects to the IO-Link master over up to 20 m of cable. The EMMA runs on 24 V DC at less than 30 mA, and the operating temperature ranges from −20 °C to +80 °C. EMC is tested to EN 61000-6-2 and EN 61000-6-4.
Benefits at a glance
- IO-Link amplifier for 1 strain gauge full bridge, min. 350 Ω
- Measuring range freely adjustable −32000 … +32000, 16 bit
- Accuracy 0.05 % of range, response time 20 ms
- Head temperature and 5 status bits in the process data
- Load spectrum and temperature spectrum stored in the device
- Smoothing, pre-filter and auto-zero set over IO-Link
- PBT GF30 housing, 72 × 28 × 35 mm, potted, at least IP65
- M12 on both sides, 24 V DC, −20 … +80 °C
All technical data, dimensions and the wiring diagram are in the datasheet, and the parameter setting is described in the manual, both available for download.