77 and 771 Current-to-Pneumatic Transducers

Transducers
Models 77 and 771 Current-to-Pneumatic Transducers
Technical data
Surface Mounting
Specifications – Series 771
Two 1/4 x 20 x 5/16" deep blind tapped holes
Functional Specifications
Enclosure
Supply Pressure
NEMA 3R
NEMA 4 via conduit vent
20 psig (35 psig for 771-8_ _ _)
Input/Output Data
Electrical Classification
FM Approved
Model 77
Non-incendive for Class I, Div. 2, Groups A, B, C, D.
Dust-ignition proof for Class II, Div. 1, Groups E, F, G.
Suitable for Class III, Div. 1 hazardous locations and
NEMA 4.
Model 77XXF
Intrinsically safe for Class I/II/III, Div. 1, Groups A, B, C,
D, E, F, G and NEMA 4 when used with approved
barriers and converters listed on Siemens drawing
#15032-7704/7705.
See Model Selection
Zero Offset Adjustment
+40% and –20% of span
3
Output Capacity
Standard: 0.16 scfm
Boosted: 2.0 scfm
Supply Pressure Effect
Less than 2% of span (change of output for supply
change from 18 to 22 psig)
Temperature Range
Performance Specifications
-40 to 180°F (-40 to 82°C)
Calibration Accuracy
Electrical Connections
±0.25% of span
Enclosed terminal block, 1/2" threaded
Reproducibility
Enclosed
0.2% of span
NEMA 3R
NEMA 4 via conduit vent
Response Level
Electrical Classification
0.025% of span
6
Model Number
Current-to-Pneumatic
Transducer
Exhaust
• Atmospheric
• Tapped Exhaust
Input/Output
Input
Output
Input
Range
Impedence
Range1
(mA dc)
(psig)
(Ohms)
1 to 5
3 to 15
2450
0 to 4
3 to 15
2450
4 to 20
3 to 27
610
4 to 20
3 to 15
185
10 to 50
3 to 15
30
Intrinsically-Safe Designation
• Intrinsically Safe (omit for other
classifications)
Accessories
• Reverse Acting Output
FM Approved
Series 771_ _ _ F1: Intrinsically safe for Class I/II/III, Div. I,
Groups A, B, C, D, E, F, G when used with approved barriers
and converters listed on Siemens drawing #15032-7704/7705.
Order No.
77■■■■ - ■
▲▲▲▲
▲
E
Series 771_ _ _ F2: Non-incendive for Class I, Div. 2,
Groups, A, B, C, D. Dust-ignition proof for Class II, Div. 1,
Groups E, F and G. Suitable for Class III, Div. 1 hazardous
locations.
Performance Specifications
Calibration Accuracy
±1/2% of span standard unit
±1% of span boosted unit
3
3A
8
16
40
Reproducibility
0.2% of span
Response Level
F
0.025% of span
R
1) Other input ranges available; 0 - 3 mA to 0-60 mA, consult factory.
3.13
Transducers
Models 77 and 771 Current-to-Pneumatic Transducers
Ordering data
Order No.
Model Number
Current-to-Pneumatic
Transducer
3
Input/Output
Input
Output
Range1
Range
(mA dc)
(psig)
1 to 5
3 to 15
4 to 20
3 to 27
4 to 20
3 to 15
10 to 50
3 to 15
Output Capacity
• Boosted
• Standard
Terminal Strip
P/N 12330-100 - Wall Mount Bracket
771■■■■
▲▲▲▲
Input
Impedence
(Ohms)
2450
610
185
30
3
8
16
40
B
S
T
Electrical Approval
• None Required
• Intrinsically Safe
• Non-incendive
Mounting Dimensions – Model 77
3.14
Accessories
N
F1
F2
P/N 12334-130 - Pipe Mounting Bracket
Reverse Acting (not available on the Model 771-8)
Increase input; decrease output. Add “R” to model number.
Transducers
Models 77 and 771 Current-to-Pneumatic Transducers
Dimensional drawings
Mounting Dimensions – Model 771 S/B
3
3.15
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