SENSORAY Model 2612

Features

Interfaces 4 load cells / RTDs to Ethernet
Simultaneous measurement of four sensors
6- or 4-wire connections for high precision
200 nV resolution at 6 samples/s
Directly connects to field wiring
Connects to Ethernet through 2601
DIN-3 rail mountable

Model 2612 is a modular, four-channel resistive sensor interface that connects to Ethernet through a model 2601 communication module. It has four sensor input channels that can measure any combination of strain/pressure gauges, RTDs, and other passive resistive sensors with 24-bit accuracy. The module is a member of the 2600 series of smart I/O modules.

Analog Inputs
All measurements are made differentially to reduce common mode noise. Each channel has bridge excitation outputs with remote voltage sensing, enabling 6-wire measurements for the highest possible accuracy. RTD temperature sensors with alphas of 385 or 392 are supported, as well as other resistive devices, by integrating them into full bridge circuits. External bridge completion resistors can be easily added to the module's terminal block. Field wiring is connected directly to the 2612 via removable terminal blocks — no external termination systems are needed.

2612 block diagram, with strain gauge shown connected to one channel

Sensoray Model 2612 2612 block diagram, with strain gauge shown connected to one channel

Calibration
The 2612 maintains high accuracy by periodically sampling on-board references and using the acquired samples to correct subsequent sensor measurements. Factory calibration constants are stored in non-volatile memory so that 2612 modules can be easily installed and replaced.

Modular System
The 2612 can be connected to any of the sixteen IOM (I/O module) ports on the 2601 with a low-cost category-5 patch cable, which conveys all required operating power and communication signals. All inter-module communication circuits are optically isolated to prevent potentially disruptive ground loops.

Model 2601	Communication module
Model 2608-0	16 analog and TC inputs (16 bit)
Model 2608-4	16 analog and TC inputs (16 bit), 4 analog outputs (16 bit)
Model 2608-8	16 analog and TC inputs (16 bit), 4 analog outputs (16 bit)
Model 2610	48 digital I/O, 5VDC to 24VDC
Model 2612
Model 2620	4 encoder/counter/frequency interfaces (32 bit)
Model 2652	SSR I/O Module (Supports 8 SSRs)
Model 2653	SSR I/O Module (Supports 16 SSRs)
Model 204	Power supply, 24 VDC @ 5A

Specifications

Analog Inputs
Resolution	24 bits
Input channels	4
Conversion rate	6.875 to 3500 samples/second for each channel
Input range	±1/2 of reference
Input impedance	110 kΩ
Power Outputs
Output channels	4
Output power	1.25 V, 2 V, 3 V or 5 V, ±10% at 1 to 25 mA for each channel.
Mating Connectors
IOM port (qty 1)	RJ-45 plug, AMP 554169 or equivalent
Analog inputs (qty 4)	RJ-45 plug, AMP 554169 or equivalent Pluggable TB, 8-pin, RIA 31166108 or equivalent (included with module)
Temperature
Operating range	0 to 70 °C
Power
Input power	±24 V, ±5% at 60 mA.
Mechanical
Outer dimensions	5.0H x 5.0W x 1.8D inches, including DIN mounting frame. Depth is specified with respect to surface of DIN rail support panel. Additional clearance required for field wiring.