Fairchild T7800 Installation, Operation And Maintenance Instructions

MINIATURE ELECTRO-PNEUMATIC TRANSDUCER
Installation, Operation and Maintenance Instructions
Figure 1. Model T7800 Extended Range Transducer Identification Number System.

GENERAL INFORMATION

The Model T7800 Series of Electro-Pneumatic Trans-ducer converts
a DC input signal to a linearly proportional pneumatic output pressure.

SPECIFICATIONS

FAIRCHILD T7800 EXTENDED RANGE
Functional Specifications
psig
[BAR]
(kPa)
0-30
Output
[0-2.0]
Range
(0-200)
Input
Range
35-150
1
Supply
[2.5-10]
Pressure
(250-1000)
12.5
Minimum
[0.85]
Span
(85)
1
Supply Pressure must be no less than 5 psig, [0.35 BAR],
(35 kPa) above maximum output.
0 psig
Air Con-
[0 BAR]
sumption
(0 kPa)
0- 30 psig 3.1
(.09 m /HR)
SCFH 3
0- 60 psig 1.6
(.04 m /HR)
3
SCFH
0.5
0-120 psig
(.01 m /HR)
3
SCFH
Flow Rate
11.0 (18.7m /HR) @150 psig, [10 BAR],
S C F M (1000 kPa) supply & midscale output.
Temper- Operating . . . . . . . . . . . . . . . . . . . . .
a t u r e
Range Storage . . . . . . . . . . . . . . . . . . . . .
Span/Zero
Adjustments
Required
Two Wire Current Input
Operating
Voltages
Supply
Three Wire Voltage Input
Voltage
S i g n a l
Three Wire Voltage Input
Impedance
1
psig
psig
[BAR]
[BAR]
(kPa)
(kPa)
0-60
0-120
[0-4.0]
[0-8.0]
(0-400) (0-800)
4-20 mA DC, 0-10 VDC,
1-9 VDC, 0-5 VDC, 1-5 VDC
65-150
125-150
[4.6-10]
[8.8-10]
(460-1000) (880-1000)
25 50
[1.5]
[3.0]
(150)
(300)
Set Point
15 psig 120 psig
30 psig 60 psig
[8.0 BAR]
[1.0 BAR] [2.0 BAR] [4.0 BAR]
(800 kPa)
(100 kPa) (400 kPa)
(200 kPa)
7.81 11.8
(.22 m /HR)
3 (.33 m /HR)
3
4.7 13.3
7.8
(.13 m /HR) 3 (.22 m /HR) (.37 m /HR) 15.1
3 3
3.8 7.6 (.42 m /HR)
(.11 m /HR) (.21 m /HR)
3 3
3
-40 F to +160 F (-40 C to +71.2 C)
-40 F to +180 F (-40 C to +82.2 C)
Screwdriver adjustments located
on front of unit.
7.2 VDC @ 20 mA (4-20 mA signal)
7-30 VDC, less than 3 mA
10 Kilohms
3