Fisher C1B, Instruction Manual

Page: 3 / 40

C1 Controllers and Transmitters
Instruction Manual
September 2009
3
Table 1. Specifications
Available Configurations
See table 2
Input Signal
Type:
J
Gauge pressure,
J
vacuum,
J
compound pressure, or
J
differential pressure
of a liquid or gas
Limits: See table 3 or 4
Output Signal
Proportional
−
Only or Proportional
−
Plus
−
Reset
Controllers and Transmitters:
J
0.2 to 1.0 bar (3 to 15 psig) or
J
0.4 to 2.0 bar (6 to 30 psig) pneumatic
pressure signal
Differential Gap Controllers:
J
0 and 1.4 bar (0 and 20 psig) or
J
0 and 2.4 bar (0 and 35 psig) pneumatic
pressure signal
Action: Control action is field reversible between
J
direct (increasing sensed pressure produces
increasing output signal) and
J
reverse
(increasing sensed pressure produces decreasing
output signal).
Supply Pressure Requirements
(1)
See table 5
Supply Pressure Medium
Air or natural gas
Air Quality: Supply pressure must be clean, dry air
that meets the requirements of ISA Standard
7.0.01. A maximum 40 micrometer particle size in
the air system is acceptable. Further filtration
down to 5 micrometer particle size is
recommended. Lubricant content is not to exceed
1 ppm weight (w/w) or volume (v/v) basis.
Condensation in the air supply should be
minimized
Natural Gas: Natural gas must be clean, dry,
oil
−
free, and noncorrosive. H
2
S content should
not exceed 20 ppm.
Steady
−
State Air Consumption
(2,3)
0.2 to 1.0 bar (3 to 15 psig): 0.08 normal m
3
/hour
(3 scfh)
0.4 to 2.0 bar (6 to 30 psig): 0.12 normal m
3
/hour
(4.5 scfh)
Supply and Output Connections
1/4 NPT internal
Common Signal Pressure Conversions
See table 6
Proportional Band Adjustment
For Proportional
−
Only Controllers: Full output
pressure change adjustable from
J
2% to 100%
of the sensing element range for 0.2 to 1.0 bar (3
to 15 psig) or
J
4% to 100% of the sensing
element range for 0.4 to 2.0 bar (6 to 30 psig)
For Proportional
−
Plus
−
Reset Controllers: Full
output pressure change adjustable from
J
3% to
100% of the sensing element range for 0.2 to 1.0
bar (3 to 15 psig), or
J
6% to 100% of the
sensing element range for 0.4 to 2.0 bar (6 to 30
psig)
Differential Gap Adjustment
For Differential Gap Controllers:
Full output pressure change adjustable from
15% to 100% of sensing element range
Reset Adjustment
For Proportional
−
Plus
−
Reset Controllers:
Adjustable from 0.01 to 74 minutes per repeat
(100 to 0.01 repeats per minute)
Zero Adjustment (Transmitters Only)
Continuously adjustable to position span of less
than 100% anywhere within the sensing element
range
Span Adjustment (Transmitters Only)
Full output pressure change adjustable from 6 to
100% of sensing element range
Performance
Repeatability: 0.5% of sensing element range
Deadband (Except Differential Gap
Controllers)
(4)
: 0.1% of process sensing element
span
Typical Frequency Response at 100%
Proportional Band
Output to Actuator: 0.7 Hz and 110 degree phase
shift with 1850 cm
3
(113 inches
3
) volume,
actuator at mid
−
stroke
Output to Positioner Bellows: 9 Hz and 130
degree phase shift with 0.2 to 1.0 bar (3 to 15
psig) output to 33 cm
3
(2 inches
3
) bellows
−
continued
−