Adjustable Bridge Excitation 1 to 10V with up to       120mA drive

Eleven Field Configurable Input Ranges from       10mV to ±200mV (0.5mV/V to >50mV/V)

Five Field Configurable Output Ranges: 0-5V, 0-       10V, 0-1mA, 0-20-mA and 4-20mA

TouchCAL Technology for Easy Non-Interactive       Zero and Span Adjustments and TARE

Universal AC Power 85 to 265 VAC

The ActionI/Q Q446 is a DIN rail mount, bridge or strain-gage input signal conditioner with 1800VDC isolation between input, output and power. The field configurable input and output offers flexible, wide ranging capability for bridge or strain-gage input applications from 0.5mV/V to over 50mV/V.

Low-cost microprocessor technology has enabled replacement of zero and span adjustment potentiometers with push-button, “TouchCALTM” technology. In essence, the thermal drift and mechanical variability of the potentiometers have been removed and replaced with a digitally stable circuit. Additionally, the inherent zero and span interactivity of potentiometer based analog amplifier circuitry is removed, providing 100% non-interactive adjustment.

The field configurable input of the Q446 can be set via DIP switches for any one of 11 voltage ranges from 10mV to ±200mV (see Table 1). The field configurable output is linear to the input and can be set for either 0-5V, 0-10V, 0-1mA or 4-20mA, direct or reverse acting.

TouchCAL technology enables precise calibration and provides more than 90% offset of the zero value and adjustment down to 10% of the full scale input span for most of the 11 switch selectable input ranges. For example, the DIP switch configured 0-100mV input range could be calibrated via push button for 0-40mV (i.e. 60% span reduction) or offset to a range of 60-100mV (i.e. 60% offset and 60% span reduction). If the output was configured for 0-10V, then 60- 100mV input would correspond to the 0-10V full scale output. Thus, an input range such as 90-100mV is possible using the 0-100mV range. A TARE function is also provided to allow batch offsets.

Advanced digital technology combined with Action’s exclusive ASIC technology allows the Q446 to be field configured for virtually any Bridge input to DC output within the limits specified. Calibration Protecting the Integrity of Industrial Process Signals An Invensys Company utilizes “TouchCAL” technology where the user simply configures the desired input excitation and millivolt range via switches, then applies the minimum and maximum input signals, touching a recessed button to store range values.(i.e. 60% offset and 60% span reduction).

Touchcal Technology
The Q446 utilizes Action Instruments’ TouchCAL technology which greatly simplifies calibration. Once the unit is configured via DIP switches, the push-button is used to precisely calibrate the minimum and maximum levels.

To calibrate the input within the DIP switch configured range, the user simply applies the high input signal and pushes the CAL button. The low input signal is then applied and pushing the CAL button again stores the low input signal. Note, these steps are reversed for reverse mode operation.

The high and low input levels are stored in nonvolatile memory and correspond to the high and low output levels. These output levels are precisely adjusted using the input signal.