Model 8712C/U/H Magnetic Flowemter Transmitters
6-2
Storage
–22 to 176 °F (–30 to 80 °C)
Humidity Limits
0–100% RH at 120 °F (49 °C), decreases linearly to 10% RH at
130 °F (54 °C)
Enclosure Ratings
NEMA 4X, CSA Enclosure Type 4X
Output Signals
Analog Output Adjustment
4–20 mA, jumper-selectable as internally or externally powered 5 to
24 V dc; 0 to 1000 Ω load
Engineering units – lower and upper range values
are user-selectable
Output automatically scaled to provide 4 mA at lower range value
and 20 mA at upper range value; full scale continuously adjustable
between -30 and 30 ft/s (-10 to 10 m/sec), 1 ft/s (0.3 m/s)
minimum span
HART communications, digital flow signal, superimposed on 4–20
mA signal, available for control system interface; 250 Ω required for
HART communications
Scalable Frequency Adjustment
0-1000 Hz, externally powered at 5 to 24 V dc, translator switch
closure up to 5.75 w; pulse value can be set to equal desired volume
in selected engineering units; pulse width adjustable from 0.5 to 100
m/s.
Local operator interface automatically calculates and displays
maximum allowable output frequency.
Auxiliary Output Function
Externally powered at 5 to 24 V dc, transistor switch closure up to 3
W to indicate either:
Reverse Flow: Activates switch closure output when reverse flow is
detected; reverse flow rate is displayed
Zero Flow: Activates switch closure output when flow goes to 0 ft/s
Positive Zero Return
Forces outputs of the transmitter to the zero flow rate signal level;
activated by applying a contact closure
Software Lockout
Security lockout jumper on the electronics board can be set to
deactivate all LOI and HART-based communicator functions to protect
configuration variables from unwanted or accidental change
Output Testing
Analog Output Test
Transmitter may be commanded to supply a specified current
between 3.75 and 23.25 mA
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