Fairchild TT7800 Manual

1
FAIRCHILD T7800 EXTENDED RANGE
MINIATURE ELECTRO-PNEUMATIC TRANSDUCER
Installation, Operation and Maintenance Instructions
The Model T7800 Series of Electro-Pneumatic Trans-
ducer converts a DC input signal to a linearly proportional
pneumatic output pressure.
GENERAL INFORMATION
SPECIFICATIONS
Figure 1. Model T7800 Extended Range Transducer Identification Number System.

2
(TAEI7800, TDEI7800)
Specifications (continued)
HAZARDOUS AREA CLASSIFICATION
Class I, Division 1, Groups C and D;
Temperature Code T6.
Class I, Division2, Groups A, B, C and D;
Class II, Division 2, Groups E, F, and G;
Type 4 Enclosure;
Rated 4-20 mA, 30 VDC Maximum;
Temperature Code T6.
CSA (Canadian Standards Association) Approvals:
Class I, Division 2, Groups A, B, C and D;
Temperature Code T4.
(TTFI7800, TRFI7800, TTFN7800, TRFN7800)
Division 2 Approvals: (4-20 mA only)
(TDCI7800, TTCI7800, TRCI7800)
Class I, Division 2, Groups A, B, C and D;
Rated 4-20 mA, 30 VDC Maximum;
Temperature Code T6.
(TACI7800)
0.7 W
0
0
3 Wmax = Maximum Power
4 Ceq = Capacitance
5 Leq = Inductance
Transducer Parameters
Umax 1 (Ui)
Imax 2 (Ii)
=
=28 V
100 mA
Wmax 3 (Wi)
Ceq 4 (Ci)
Leq 5 (Li)
=
=
=
1 Umax = Maximum Voltage
2 Imax = Maximum Current
Class I, Division 1, Groups C and D;
Class II, Division 1, Groups E, F, and G;
Type 4 Enclosure;
Rated 4-20 mA, 30 VDC Maximum;
Temperature Code T6.
(TTCI7800, TRCI7800)
Approvals are valid when connected through a Shunt
Zener Diode Safety Barrier meeting the following para-
metric requirements:
System
Type 2:
FM Approval (continued):
Class I, Division 2, Groups A, B, C and D;
Class II, Division 2, Groups F, and G;
Class III, Division 2;
NEMA 4X Enclosure;
Temperature Code T4.
FM (Factory Mutual) Approvals:
(TTFI7800, TRFI7800)
Entity Parameters
Vmax 1
Imax 2
1 Vmax = Maximum Voltage
2 Imax = Maximum Current
30 VDC
200 mA
Ci 3
Li 4 0 F
0 mH
3 Ci = Capacitance
4 Li = Inductance
Class I, Division 1, Groups C and D;
Temperature Code T4.
Non-Incendive: (4-20 mA and voltage input units)
(TDFI7800, TAFI7800, TDFN7800, TAFN7800)
Intrinsically Safe: (4-20 mA only)
(TDFI7800, TAFI7800)
Dual Channel Polarized Rated: 28.5V Max. 300
Ohm Min. and 28V Diode return per channel.
Dual Channel Polarized Rated: 28.5V Max. 300
Ohm Min. and 10V Max. 50 Ohm Min.
System
Type 3:
Single Channel Polarized Rated: 28.5V Max.
300 Ohm Min.
System
Type 1:
ATEX Approvals:
Intrinsically Safe: (4-20 mA only)
(TAEI7800, TDEI7800, TTEI7800, TREI7800)
Class I, Division 1, Groups C and D;
Class II, Division 1, Groups E, F, and G;
Class III, Division 1,Fibers;
NEMA 4X Enclosure;
Temperature Code T4.
II 1G (T4)
EEx ia IIB, T4 (-200 C to +720C Ambient).
IP65 Enclosure.
=
=
=
=
Intrinsically Safe: (4-20 mA only)
(TDCI7800, TACI7800)

3
Figure 3. Mounting Kit EA-16799-1. (Included with Unit)
Figure 2. TA7800 Outline Dimensions.
INSTALLATION
The TR7800 Transducer is designed for use
with the TR Rack Kit. Physically, it is the same
as the TT7800 (Terminal Block) Unit except
that the terminal block has been rotated to the
rear. For more information, see Figure 6.
“TR7800 Outline Dimensions” on page 4.
NOTE:
The Model T7800 can be mounted directly onto a flat
surface using two 10-32 Screws. For more information,
see Figure 2. “TA7800 Outline Dimensions”.
The Model T7800 is supplied with a Mounting Kit EA-
16799-1 for Panel or Wall Mounting and a Mounting Bracket
Kit EA-16893-1 for Din Rail Mounting. For more informa-
tion, see Figure 3. on page 3 and Figure 7. on page 5.
An Optional Mounting Kit EA-19254-1 is available when
installing the unit on a 2" pipe. For more information, see
Figure 8. on page 5.
ATEX Directive - Special Conditions for Safe Use:
The enclosure is manufactured from aluminum alloy. In rare cases, ignition sources due to impact and friction sparks could occur.
This shall be considered when the equipment is installed in locations that specifically require Group II, category 1G equipment.

4
OUT
OUT
IN
IN
OUT
OUT
IN
IN
OUT
OUT
IN
IN
Z
S
Z
S
Vent
111/16
42.9
15/16
33.3
27/32
21.5
27/32
21.5
21/4
57.1
21/4
57.1
1 33/64
38.7
1 33/64
38.7
421/32
118.1
127/64
36.2
515/64
133.0
515/64
133.0
457/64
124.3
457/64
124.3
++_
VV
S
++_
VVS
90 Alternating
Positions
1/4 NPT
Outlet
Port (2)
(typical)
1/4 NPT
Inlet
Port (2)
(typical)
1/4 NPT
Outlet
Port (2)
(typical)
1/4 NPT
Inlet
Port (2)
(typical)
1/4 NPT
Outlet
Port (2)
(typical)
1/4 NPT
Inlet
Port (2)
(typical)
Figure 6. TR7800 Outline Dimensions.
Figure 5. TD7800 Outline Dimensions.
Figure 4. TT7800 Outline Dimensions.
Installation (continued)

5
Figure 8. Optional Mounting Kit EA-19254-1. (Sold Separately)
Installation (continued)
Figure 7. Din Rail Mounting Kit EA-16893. (Included with Unit)

6
Figure 9. Electrical Connections.
Wiring in Hazardous Areas
Electric Connections
Make connections to the Terminal Block, Conduit Connec-
tor or the DIN Connector as shown below in Figure 9.
“Electrical Connections”.
Intrinsically Safe Connections
Pneumatic Connections
Clean all pipelines to remove dirt and scale before instal-
lation.
Apply a minimum amount of pipe compound to the male
threads of the fitting only. Do Not use teflon tape as a
sealant. Start with the third thread back and work away
from the end of the fitting to avoid the possibility of
contaminating the transducer. Install the transducer in
the air line.
The inlet and outlet ports, in the lower valve body, are
labeled on the ends of the transducer. Tighten connec-
tions securely. Avoid undersized fittings that will limit the
flow through the transducer and cause a pressure drop
downstream. For more information, see Figure 2.
“Outline Drawing” on page 3.
NOTE:
Wiring in hazardous areas should be performed in accor-
dance with the table 1. and any local codes that apply.
Instrument quality air, per ISA Standards S7.3-
1981, is required. Use a filter to remove dirt
and liquid in the air line ahead of the trans-
ducer for correct performance. If an air line
lubricator is used, it MUST be located down-
stream, beyond the transducer.
The user is responsible for insuring that the
environment in which the unit will be in-
stalled, and the operating gas, are compatible
with the materials in the transducer.
Table 2. Intrinsically Safe Connections.
FM (Factory Mutual)
CSA (Canadian Standards)
ATEX
EC-18970
EC-18971
EC-18972
Underwriting Group Drawing Number
Refer to the latest revision of the indicated drawing.
Code
Table 1. Hazardous Location Wiring Practices.
Country Agency
U.S.
Canada
Europe
FM
CSA
ATEX
ANSI/ISA RP 12.6
ANSI/NFPA 70
CED Part 1
EN 50 039

7
SPLIT RANGE OPERATION
Lo/Hi Span Adjustment
1.
Forward Acting Mode Adjustment
2.
• Forward Acting Calibration - Zero
3.
• Forward Acting Calibration - Span
4.
5.
Reverse Acting Mode Adjustment
NOTE:
6.
• Reverse Acting Calibration - Zero
7.
• Reverse Acting Calibration - Span
8.
9.
Set the Lo/Hi Span switch to the Lo position for 0-15
psig, 15-30 psig, 0-30 psig, 30-60 psig, 0-60 psig, or
60-120 psig, output range. For more information,
see Table 4. “Split Range Operation” on page 8.
Set Fwd/Rev Mode Jumper to the Forward position.
Apply the minimum input signal and adjust the Zero
screw for minimum output pressure.
Apply the maximum input signal and adjust the Span
screw for maximum output pressure.
Repeat steps 3-4 until the desired output range is
obtained.
Set Fwd/Rev Mode Jumper to the Reverse position.
Apply the maximum input signal and adjust the Zero
screw for minimum output pressure.
Apply the minimum input signal and adjust the Span
screw for maximum output pressure.
Repeat steps 7-8 until the desired output range is
obtained.
FULL RANGE OPERATION
Lo/Hi Span Adjustment
1.
Forward Acting Mode Adjustment
2.
• Forward Acting Calibration - Zero
3.
• Forward Acting Calibration - Span
4.
5.
Reverse Acting Mode Adjustment
NOTE:
6.
• Reverse Acting Calibration - Zero
7.
• Reverse Acting Calibration - Span
8.
9.
CALIBRATIONS / ADJUSTMENTS
Equipment Required for Calibration:
•Pneumatic Supply capable of delivering up to 150 psig.
•Current Supply capable of delivering up to 60 mA.
•Pressure Gage capable of a digital readout up to 150
psig with an accuracy of .1%.
• Digital Volt Meter capable of a readout up to 60 mA with
an accuracy of .02%.
The following adjustments are provided:
Full Range Operation
Lo/Hi Span
Forward/Reverse Mode
Calibration - Zero and Span
Split Range Operation
Damping Adjustments
Set the Lo/Hi Span Jumper to the Hi position for 0-30
psig, 0-60 or 0-120 psig output range. For more
information, see Table 3. “Full Range Operation” on
page 8.
Set Fwd/Rev Mode Jumper to Forward position.
Apply the minimum input signal and adjust the Zero
screw for minimum output pressure.
Apply the maximum input signal and adjust the Span
screw for maximum output pressure.
Repeat steps 3-4 until the desired output range is
obtained.
Set Fwd/Rev Mode Jumper to the Reverse position
Apply the maximum input signal and adjust the Zero
screw for minimum output pressure.
Apply the minimum input signal and adjust the Span
screw for maximum output pressure.
Repeat steps 7-8 until the desired output range is
obtained.
Additional Adjustments
• Damping Adjustment
The Damping Adjustment is used so that the transducer
can be tuned for optimum response and stability in a
particular application.
For best performance start Damping Adjustment at
maximum adjustment (fully clockwise). Gradually turn
counterclockwise until slight oscillation occurs and then
turn back clockwise until oscillation is minimized. For
more information, see Figure 10. “T7800 Calibration
Configuration”
Turn Damping Adjustment clockwise to increase
damping function.
Turn Damping Adjustment counterclockwise to
decrease damping function.
DO NOT reverse the input leads.
DO NOT reverse the input leads.
1.
2.

8
Figure 10. T7800 Calibration Configuration.
Calibrations / Adjustments (continued)
Jumper
Jumper
0-15 0-1 0-100 LO
15-30 1-2 100-200 LO
0-30 0-2 0-200 LO
30-60 2-4 200-400 LO
0-60 0-4 0-400 LO
60-120 4-8 400-800 LO
Input Output
4-20 mA, 0-5, 1-5,
0-10 & 1-9 VDC
Split Range Output.
psig BAR (kPa)
1
111
1
11
11
1
111
1
11
11
1
Span
Position
Table 4. Split Range Operation.
0-30 0-2 0-200 HI
0-60 0-4 0-400 HI
0-120 0-8 0-800 HI
Input Output
psig BAR (kPa)
4-20 mA, 0-5, 1-5,
0-10 & 1-9 VDC
Span
Position
Table 3. Full Range Operation.
J1 Jumper
J1
J1
J1
J1
A
A
A
A
B
B
B
B
C
C
C
C
D
D
D
D
H
J7
J7
L
FORWARD ACTING
OPERATION
(Current Unit)
FORWARD ACTING
OPERATION
(Voltage Unit)
REVERSE ACTING
OPERATION
(Current Unit)
REVERSE ACTING
OPERATION
(Voltage Unit)
J7 Jumper
Zero
Adjustment
Span
Adjustment
DAMPING
ADJUSTMENT
Decrease
Damping
Function
Increase
Damping
Function
LO SPAN SETTING
(Current & Voltage)
HI SPAN SETTING
(Current & Voltage)

9
1
2
3
4 1
5
6 2
6 3
6 4
7
8 1
9 1
10
11 1
12 1
13
14
15
16
17 1
18
19
20 1
21
22 2
22 5
23
24 1
25
26
27
28
29 1
30
31
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
2
1
1
1
1
1
1
1
3
1
1
1
1
2
Figure 11. Exploded Drawing.
Qty. Description
Cover, Machining
Screw
Screw
Gasket
Nozzle Body Assembly
Orifice Assembly
Orifice Assembly
Orifice Assembly
Spring
Disk
Diaphragm
Spacer Ring
Diaphragm Assembly
Foam Block
Valve Body Assembly
Screw
Pintle
Spring, PIntle
O-Ring
Plug
Screw
Diaphragm
Spacer Ring
Diaphragm Assembly
Diaphragm Assembly
Spring
Foam Block
Valve Body Assembly
Screw
Pintle
Spring, Pintle
O-Ring
Plug
Screw
5EA-19267-5 & EA-19267-6 Service Kit
3EA-19267-5 Service Kit Components Only.
0-60 psig, [0-4.0 BAR], (0-400 kPa)
2EA-19267-4 Service Kit Components Only.
0-30 psig, [0-2.0 BAR], (0-200 kPa)
4 EA-19267-6 Service Kit Components Only.
0-120 psig, [0-8.0 BAR], (0-800 kPa)
1 For All Service Kits.
Table 5. T7800 Transducer Components.
Item

IS-50T7800E
Litho in USA
Rev. H 04/05
1.
2.
3.
Shut off the valve that is supplying air to transducer.
It is not necessary to remove the Transducer
from the air line.
Remove the Orifice Assembly (6) from the unit. For
more detailed information see Figure 11. “Exploded
Drawing” on page 9.
Clean with alcohol and dry with compressed air.
To clean the Orifice, use the following procedure:
MAINTENANCE
Parts must be completely dry before reassem-
bling.
If the standard maintenance procedure does
not correct the trouble, install Service Kit.
NOTES:
TROUBLE-SHOOTING
Table 6. Trouble-Shooting.
Problem Solution (check)
Supply Pressure
Clogged Orifice
Connections
Zero and Span Adjust
Supply Pressure Low
Output Leakage
DC Signal
Loose Wires or Connections
Liquid in Air Supply
No Output
Leakage
Low or Improper
Span Adjust
Erratic Operation
WARNING: Failure of Transducer could result in out-
put pressure increasing to supply pres-
sure possibly causing personal injury or
damage to equipment.
LEGAL NOTICE:
The information set forth in the foregoing Installation, Operation and Maintenance Instructions shall not be
modified or amended in any respect without prior written consent of Fairchild Industrial Products Company.
In addition, the information set forth herein shall be furnished with each product sold incorporating Fairchild's
unit as a component thereof.