Badger Meter SRD/SRI Valve Positioners - Manual (Page 8)

HART COMMUNICATION SUMMARY
Mounting to the Actuator (Valve)
The SRD960 can be mounted to stroke or rotary actuators
Connection and Startup
Connect the pneumatic tubing Upon connection of supply air and a voltage source of, for example, 12V DC to the input
terminals (pay attention to polarity), an initial startup can be carried out without any further equipment
Use the local push-buttons to change basic parameters such as type of actuator, side of installation, valve opens/closes with
increasing setpoint value, and characteristics curve of the valve (values set ex-factory: stroke actuator, mounting side: left,
valve opens with increasing setpoint value, linear characteristics curve)
Thereafter, an AUTOSTART can be performed during which the SRD960 determines independently the geometric data of the
actuator as well as control parameter, to ensure an optimized operation with the attached valve
HART Version
The positioner can be operated either locally or via a handheld terminal or PC (via modem)
System Configuration
HART Version
When using Communication (an AC signal which modulates on the 4…20 mA signal), make sure that the connected outputs,
buffer amplifier and barriers are compatible with the frequency ranges used In addition to the load, the AC impedances
requirements must be met Use only the specified amplifier, barrier and configuration device
To prevent crosstalk between lines and reduce disturbances through electromagnetic influences, use twisted-pair shielded
lines with a diameter of AWG 22…14 (0 3…2 5 mm 2 ) and a maximum capacity of 100 pF/m
The line capacities and connected devices may not exceed the maximum values listed for a particular HART protocol
All components connected to the SRD in an explosion-hazard area require an Ex-Approval The applicable limit values must
not be exceeded These limit values also must be adhered to when connecting additional capacitances, inductances, voltage
or current sources
Figure 2: HART communication
Page 8
Hart Communication Summary
August 2014 POS-UM-00009-EN-02