1.0 DESCRIPTION
Figure 1-1. Model 509-1
1.1 DEFINITION/APPLICATION
Model
509 is a signal powered, two-wire current-loop indicator that
accepts a 4-20 mA process signal. It computes the square root
of the input, normalized to full scale and digitally displays
(2000 active counts) the process variable in either percent or
in engineering units for such parameters as pressure or flow.
1.2 FEATURES
In-field
Programmability
Three decimal points and a dummy right-hand zero are selected
by push-on jumpers. Zero and span may be fine tuned with precision,
25-turn potentiometers.
Signal Powered
Model 509 obtains operating power directly from the current loop,
requiring a drop of less than 2.5 V.
Electrical Isolation/Overrange Protection
The 509 is electrically isolated from its case and is immune to
most sources of electrical noise encountered in process-control
environments. In the event of input overrange currents, the 509
can tolerate 250 mA in the forward direction and 1000 mA reverse.
Vibration/Shock/Water Resistance
Low mass and multi-point circuit board support give excellent
vibration and shock resistance. Sturdy, die-cast construction,
polyurethane paint, and full fluorosilicone gasketing ensure a
virtually waterproof case. Circuit boards are conformally coated
for added humidity protection.
Mounting Versatility
The 509-1 may be mounted in a control room on either American
or European relay tracks with snaptrack adaptors. The unit can
be wall mounted using an available bulkhead adaptor or mounted
in an explosion-proof enclosure for wiring compatability with
other equipment in hazardous environments. Both the 509-2 and
the 509-3 may be connected directly to a conduit with a "T" junction
box.
2.0 SPECIFICATIONS
2.1 INPUT
Current:
4-20 mA
Voltage drop: 2.6 V max forward; up to 20 mA
Protection: 250 mA forward at 3 V or 6 V with
IS option; 1000 mA reverse at 2.5 V
Zero range: 3.9 to 4.2 mA
Span range: 0 to 2000 counts, continuously adjustable
with 25-turn potentiometer
Common mode voltage: 700 V peak from dc to 60 Hz (meter
to case)
2.2 ACCURACY
Accuracy:
Within ±0.1% Span ±1 Count at +25°C
Zero Tempco: ±0.1 Count/K typ., ±0.2 Count/K max.
Span Tempco: ±0.01% Span/K typ., ±0.02% Span/K max.
2.3 DISPLAY
Type:
7-segment LCD, 8.9 mm (0.350 in) high
Color: Black digits on white background
Symbols: -1.8.8.80
Underrange: Minus sign
Extra digit: Dummy right-hand zero is jumper selectable
Decimal points: Three positions, jumper selectable
Lifetime: More than 30,000 hours to 2:1 contrast ratio
2.4 CONVERSION
Technique:
Analog square root function generator followed by dual-slope
analog to digital converter with autozero correction
Signal integration period: 100 msec typ.
Reading rate: 2.0/sec
2.5 ENVIRONMENTAL
Temperature:
-20 TO +65°C
Humidity: To 95% at 40°C
Vibration: 1.52 mm (.06 in) double amplitude, 10-80
Hz cycled
Shock: 55 g, half-sine, 9-13 msec duration
Water resistance: Watertight to a proof pressure of
35 kPa (5 psi)
Mounting position: Any
2.6 MECHANICAL
Weight:
400 g (14 oz)
Diameter: 74 mm (2.9 in)
Height: 48 mm (1.9 in) including barrier
Electrical connections: Standard: 3-position barrier
strip with #6 screw wire clamps Optional: Two #18 stranded wires,
33 mm (12 in) long
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