6
Section 1
Model 764 Differential Pressure Transmitter
Specifications
Performance
Input Range
....................................
0-60 inches (water column) to 0-320 psid
Output ............................................. 4-20 mA or 10-50 mA, direct and reverse acting
Reference Accuracy* ......................
±0.5% of factory-calibrated span, including effects of
conformance (non-linearity), deadband, hysteresis,
and repeatability
Adjustability
....................................
±5% field adjustability of factory-calibrated span,
without affecting normal or accident condition perfor
-
mance. Span is field adjustable from 20% to 100%
of factory-calibrated span. Zero is field adjustable for
up to 30% suppression. Zero or Span adjustments
beyond ±5% affect normal and accident condition
performance.Calibration is by the end-point method
with zero and full scale outputs held to ±0.05% of
true.
Sensitivity* ...................................... ±0.01% of factory-calibrated span
Power Requirements ...................... 15 VDC plus 2 VDC per 100 Ohm load to 53 VDC
maximum (4-20 mA)
15 VDC plus 5 VDC per 100 Ohm load to 52 ±1 VDC
(53 VDC maximum) for 10-50 mA
Load Range
(includes line and receiver)
.............
50 Ohms per volt above 15 VDC (4-20 mA)
20 Ohms per volt above 15 VDC (10-50 mA)
Load Effect*
.................................... < ±0.05% of factory-calibrated span per 100 Ohm
change (4-20 mA)
< ±0.1% of factory-calibrated span per 100 Ohm
change (10-50 mA)
Power Supply Effect*
...................... < ±0.025% of factory-calibrated span per 1 Volt
change (4-20 mA)
< ±0.05% of factory-calibrated span per 1 Volt
change (10-50 mA)
Suppression....................................
100% of calibrated span (factory adjustment), 30%
with potentiometer
Span Control...................................
20% to 100% of maximum span (±5% only without
degradation of specifications); potentiometer range
is greater than 2:1 at maximum span and greater
than 1.5:1 at minimum span
Noise* ............................................. < 0.5% peak-to-peak of factory-calibrated span
Thermal Effect* (combined
effect on zero and span)
.................
±1.0% of factory-calibrated span per 100°F change
from +40°F to +150°F
±1.5% of factory-calibrated span per 100°F change
from +150°F to +320°F
Radiation* ....................................... ±10.0%@2 x 10
8
Rads TID Gamma; pressure
boundaries tested to 9 x 10
8
TID Beta
Seismic:
During Event* ............................. < ±5.0% error
After Event* ................................ < ±0.5% error
