Instruction Manual
D200108X012
546 Transducer
March 2015
2
Table 1. Specifications
Available Configurations
Electro‐pneumatic signal transducer with
explosion‐proof case and cover
The 546 can be ordered with or without a Fisher 67
filter regulator. A 51 mm (2 inch) circular supply
pressure gauge may be mounted on the regulator.
Input Signals
J 4 to 20 mA DC, J 10 to 50 mA DC, J 1 to 9 VDC,
or J two‐way split range using any half of one of the
standard input signal spans
Internal Resistance of Torque Motor
4 to 20 mA DC Input Signal: 176 ±10 ohms
10 to 50 mA DC Input Signal: 90 ±10 ohms
1 to 9 VDC Input Signal: 1300 ±50 ohms
(temperature‐compensated circuit)
Output Signals
Ranges:
0.2 to 1.0 bar (3 to 15 psig), 0.4 to 2.0 bar (6 to 30
psig), 0 to 1.2 bar (0 to 18 psig), or 0 to 2.3 bar (0 to
33 psig)
Action: The 546 is field‐reversible between direct and
reverse action.
Supply Pressure
(1)
Recommended: 0.3 bar (5 psig) higher than upper
range limit of output signal
Maximum: 3.5 bar (50 psig)
Maximum Steady‐State Air Consumption
(2)
At 1.4 bar (20 psig) Supply Pressure: 0.6 normal
m
3
/hr (21 scfh)
At 2.4 bar (35 psig) Supply Pressure: 0.8 normal
m
3
/hr (30 scfh)
Maximum Output Air Capacity
(2)
At 1.4 bar (20 psig) Supply Pressure: 12.9 normal
m
3
/hr (480 scfh)
At 2.4 bar (35 psig) Supply Pressure: 18.5 normal
m
3
/hr (690 scfh)
Performance
(3)
Actuator Loading Time: See figure 7
Reference Accuracy: ±0.75% of output signal span
Independent Linearity: ±0.50% of output signal span
Open Loop Gain: 26
Frequency Response: Gain is attenuated 3 dB at 20 Hz
with transducer output signal piped to a typical
instrument bellows with 305 mm (12 inches) of 1/4
inch tubing
Electromagnetic Interference (EMI): Tested per IEC
61326‐1 (Edition 1.1). Meets emission levels for Class
A equipment (industrial locations) and Class B
equipment (domestic locations). Meets immunity
requirements for industrial locations (Table A.1 in the
IEC specification document). Immunity performance
shown in table 2.
Operative Ambient Temperature Limits
(1)
-40 to 66_C (-40 to +150_F)
Electrical Classification
Hazardous Area:
CSA—Explosion-proof, Dust Ignition‐proof, Div 2
FM—Explosion‐proof, Non‐incendive
Refer to tables 3 and 4, and figure 2 for specific
approval information.
NEMA 3R, CSA enclosure 3
NEMA 3R mounting orientation requires vent location
to be below horizontal. Vent is shown in figure 10,
key 69.
Adjustments
Zero and Span Adjustments: Screwdriver adjustments
located inside case (see figure 5)
Connections
Supply Pressure: 1/4 NPT internal located on side of
case, (or located on the 67CFR filter‐regulator if
mounted)
Output Pressure: 1/4 NPT internal located on side of
case
Vent: 1/4 NPT internal with screen located on relay
Electrical: 1/2 NPT internal located on bottom of case
-continued-
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