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546NS Transducer
June 2021
Table 1. Specifications
Available Configuration
Electro‐pneumatic signal transducer with
explosion‐proof case and cover, with EPDM
elastomers for use in elevated temperature and
radiation environments
The 546NS can be ordered with or without a Fisher 67
series 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)
Action: 546NS is field‐reversible between direct and
reverse action.
(1)
Supply Pressure
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
At 1.4 bar (20 psig) Supply Pressure:
3
0.6 normal m
/hr (21 scfh)
At 2.4 bar (35 psig) Supply Pressure:
3
0.8 normal m
/hr (30 scfh)
Maximum Output Air Capacity
At 1.4 bar (20 psig) Supply Pressure:
3
12.9 normal m
/hr (480 scfh)
At 2.4 bar (35 psig) Supply Pressure:
3
18.5 normal m
/hr (690 scfh)
4
(2)
(2)
-continued-
(3)
Performance
Actuator Loading Time: See figure 6
(4)
: ±0.75% of the output span
Reference Accuracy
Independent Linearity: ±0.50% of the output 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
-40 to 66_C (-40 to +150_F)
Humidity Rating
80% for temperatures up to 31_C (88_F), decreasing
linearly to 50% RH at 40_C (104_F)
Altitude Rating
Up to 2000 meters (6562 feet)
Application for Use
This product is intended for indoor use only
Electrical Classification
Hazardous Area:
CSA— Explosion-proof, Dust Ignition‐proof, Div 2
FM— Explosion-proof, Dust Ignition‐proof,
Non‐incendive
Refer to table 3 and 4 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 9, key
69.
Pollution Degree: 2
Overvoltage Category: II
Instruction Manual
D103425X012
(1)
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