Fairchild T7800 Series General instructions

1
FAIRCHILD T7800 STANDARD RANGE
MINIATURE ELECTRO-PNEUMATIC TRANSDUCER
Installation, Operation and Maintenance Instructions
Figure 1. Model T7800 Standard Range Transducer Identification Number System
Identification Number
1
2
Non-incendive (Division 2) approval on FM voltage
input units only.
Intrinsically Safe approval, including non-incendive
(Division 2), on 4-20 mA units only.
Electrical Connections
Underwriting Group
Approval Class
Input
Output
1/2 NPT Conduit
Fitting with Pigtail
Terminal Block
DIN 43650 Connection
Rack Mount
Factory Mutual
Canadian Standard
ATEX
Intrinsically Safe
Non-Incendive (Division 2)
4-20mA
1-5 VDC
0-5 VDC
1-9 VDC
0-10 VDC
3-15 psig
3-27 psig
6-30 psig
[0.2-1.0 BAR]
[0.2-1.8 BAR]
[0.4-2.0 BAR]
(20-100 kPa)
(20-180 kPa)
(40-200 kPa)
(A)
(T)
(D)
(R)
()
(N)
I
(4)
(5)
(7)
(9)
(0)
(F)
(C)
(E)
(01)
(02)
(03)
(11)
(12)
(13)
(21)
(22)
(23)
Select appropriate psig, [BAR] or (kPa).
7800 -
T
1 2
GENERAL INFORMATION
The Model T7800 Series of Electro-Pneumatic Trans-
ducer converts a DC input signal to a linearly proportional
pneumatic output pressure.
SPECIFICATIONS
Minimum
Span
3-15
[0.2-1.0]
(20-100)
4-20 mA DC, 0-10 VDC,
1-9 VDC, 0-5 VDC, 1-5 VDC
20-120
[1.5-8.0]
(150-800)
5
[0.35]
(35)
3-27
[0.2-1.8]
(20-180)
10
[0.7]
(70)
32-120
[2.2-8.0]
(220-800)
6-30
[0.4-2.0]
(40-200)
35-120
[2.4-8.0]
(240-800)
10
[0.7]
(70)
psig
[BAR]
(kPa)
psig
[BAR]
(kPa)
psig
[BAR]
(kPa)
Functional Specifications
Output
Range
Supply
Pressure
Input
Range
Air Con-
sumption
Set Point
3 psig
[0.2 BAR]
(20 kPa)
9 psig
[0.6 BAR]
(60 kPa)
15 psig
[1.0 BAR]
(100 kPa)
30 psig
[2.0 BAR]
(200 kPa)
All Ranges
(SCFH)
3.5
(.10 m /HR)
3
7.0
(.20 m /HR)
3
9.5
(.27 m /HR)
3
13.5
(.38 m /HR)
3
Flow Rate
(SCFM)
2.5 (4.25m /HR) @
25 psig, [1.7 BAR],
(170 kPa) supply &
9 psig, [0.6 BAR],
(60 kPa) output.
3 9.0 (15.3m /HR) @
120 psig, [8.0 BAR],
(800 kPa) supply &
9 psig, [0.6 BAR],
(60 kPa) output.
3
or
Temperature
Range
Operating.....................
Storage .....................
-40 F to +180 F
(-40 C to +82.2 C)
-40 F to +160 F
(-40 C to +71.2 C)
Span/Zero
Adjustments
Screwdriver adjustments located on front
of unit
Required
Operating
Voltages
Two Wire Current Input
7.2 VDC @ 20 mA (4-20 mA signal)
Supply
Voltage
Three Wire Voltage Input
7-30 VDC, less than 3 mA
Signal
Impedance
Three Wire Voltage Input
10 Kilohms

Specifications (continued)
Performance Specifications
Accuracy
(ISA S51.1)
+
+
0.25% Full Scale Guaranteed
0.15% Full Scale Typical
Hysteresis
(ISA S51.1) 0.1% Full Scale
Deadband 0.02% Full Scale
(ISA S51.1)
Repeatability
0.1% Full Scale
Position
Effect No measurable effect
Vibration
Effect
Less than 1% of Span under the following
conditions: 5-15 Hz @ 0.8 inches constant
displacement 15-500 Hz @ 10 g's.
+
Reverse
Polarity
Protection
No damage occurs from reversal of normal
supply current (4-20 mA) or from mis-
application of up to 60 mA.
RFI/EMI
Effect
Less than 0.5% of span @ 30 /m class 3 Band
ABC (20 to 1000 mHz) per SAMA PMC 33.1
1978 and less than 0.5% of span @ 10 /m level.
2 Ghz band per EN 61000-4-3:1998+A1 EMC
Directive 89/336/EEC European Norms EN
61326.
v
v
Supply
Pressure
Effect
No measurable effect
Effect
Temperature
[0.5% +0.04% / F Temperature Change] of
Span guaranteed
+
-
psig
[BAR]
(kPa)
psig
[BAR]
(kPa)
psig
[BAR]
(kPa)
Frequency
Response
3-15
[0.2-1.0]
(20-100)
3-27
[0.2-1.8]
(20-180)
6-30
[0.4-2.0]
(40-200)
-3db@5HzperISAS26.4.3.1
load configuration A.
Materials of
Construction
Chromate Treated
Aluminum
Nickel Plated Brass
& Sapphire
Stainless Steel
Brass & Zinc Plated Steel
Nitrile
Epoxy Powder Coating
Elastomers......................
Finish.............
Body and Housing.......
Orifice...............
Trim.....................
HAZARDOUS AREA CLASSIFICATION
Factory Mutual (FM) Approvals:
Intrinsically Safe: (4-20 mA only)
(TDFI7800, TAFI7800)
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.
(TTFI7800, TRFI7800)
Class I, Division 1, Groups C and D;
Temperature Code T4.
Non-Incendive: (4-20 mA and voltage input units)
(TDFI7800, TAFI7800, TDFN7800, TAFN7800)
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.
(TTFI7800, TRFI7800, TTFN7800, TRFN7800)
Class I, Division 2, Groups A, B, C and D;
Temperature Code T4.
Canadian Standards Association (CSA) Approvals:
Intrinsically Safe: (4-20 mA only)
(TDCI7800, TACI780)
Class I, Division 1, Groups C and D;
Class 11, Division 1, Groups E, F, and G;
Type 4 Enclosure;
Rated 4-20 mA, 30 VDC maximum;
Temperature CodeT6.
(TTCI7800, TRCI7800)
Class 1, Division 1, Groups C and D;
Temperature Code T6.
Approvals are valid when connected through a Shunt Zener
Diode Safety Barrier that meets the parametric require-
ments shown in the following table.
Parametric Requirements
System
Type 2:
System
Type 3:
System
Type 1:
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.
Single Channel Polarized Rated: 28.5V Max.
300 Ohm Min.
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)
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.
ATEXApprovals:
Intrinsically Safe: (4-20 mA only)
(TAEI7800, TDEI7800, TTEI7800, TREI7800)
EEx ia IIB, T4 (-200C to +720C) ambient
II 1G (T4)
(TAEI7800, TDEI7800)
IP65 Enclosure
Transducer Parameters
Umax 1
Imax 2
=
= 28 V
100 mA
0.7 W
0
0
Wmax 3
Ceq 4
Leq 5
=
=
=
1 Umax = Maximum Voltage
2 Imax = Maximum Current
3 Wmax = Maximum Power
4 Ceq = Capacitance
5 Leq = Inductance
Entity Parameters
Vmax 1 30 VDC
= Ci 3 0 F
Imax 2 200 mA
= Li 4 0 mH
1 Vmax = Maximum Voltage
2 Imax = Maximum Current
3 Ci = Capacitance
4 Li = Inductance
2

INSTALLATION
You can mount the Model T7800 on a flat surface using two
10-32 Screws. For more information, see Figure 2.
The Model T7800 ships from the factory with Mounting Kit
16799-1 for Panel or Wall Mounting and Mounting Bracket
Kit 16893-1 for Din Rail Mounting. For more information, see
Figure 3 and Figure 7.
An optional mounting kit, 19254-1, is available to install the
unit on a 2" pipe. For more information, see Figure 8.
ATEX Directive- Special Conditions for Safe Use
Theenclosure is manufactured fromaluminumalloy. Inrare
cases, igntion 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.
NOTE: 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
back. For more information, see Figure 6.
1/2-14
NPT
OUT
Z
IN
S
3 23/32
94.5
3 5/32
80.3
1/2
12.7
25/32
19.7
25/64
9.8
1
25.4
OUT IN
2 3/64
51.8
Use two
10-32
Screws for
mounting
3 3/64
77.5
2 1/4
57.1
1 33/64
38.7
Orifice
Inlet
Outlet
Vent
Figure 3. Mounting Kit 16799-1 (included with unit)
Figure 2. TA7800 Outline Dimensions
3

Installation (continued)
Figure 6. TR7800 Outline Dimensions
Figure 5. TD7800 Outline Dimensions
Figure 4. TT7800 Outline Dimensions
4

Figure 8. Optional Mounting Kit 19254-1 (sold separately)
Figure 7. Din Rail Mounting Kit 16893-1 (included with unit)
5

Pneumatic Connections
Clean all pipelines to remove dirt and scale before installa-
tion.
Apply a minimum amount of pipe compound to the male
threads of the air line 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 contaminating the
transducer.
The inlet and outlet ports are labeled on the ends of the
transducer. Tighten all connections securely. Avoid
undersized fittings that will limit the flow through the
transducer. For more information, see Figure 2.
NOTE: 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. If an air line lubricator is used, it MUST
be located downstream to avoid interference
with transducer performance.
The user is responsible for ensuring that the
environment in which the unit is installed and
the operating gas are compatible with the
materials in the transducer.
Electrical Connections
Make connections to the Terminal Block, Conduit Connec-
tor or the DIN Connector as shown in Figure 9.
Wiring in Hazardous Areas
Wiring in hazardous areas should comply with the codes
in Table 1 and with any local codes that apply.
Table 1. Hazardous Location Wiring Practices
Country Agency Code
U.S. FM ANSI/ISA RP 12.6
ANSI/NFPA70
Canada CSA CED Part 1
Europe ATEX EN 50 039, EN 60079-14,
IEC60079-14
Intrinsically Safe Connections
For more information, see the latest revisions of the draw-
ings listed in Table 2.
Table 2. Intrinsically Safe Connections
Underwriting Group Drawing Number
FM (Factory Mutual) EC-18970
CSA(Canadian Standards) EC-18971
ATEX EC-18972
Figure 9. Electrical Connections
6

CALIBRATIONS / ADJUSTMENTS
Equipment Required for Calibration
• Pneumatic supply capable of delivering up to 120 psig
• Current supply capable of delivering up to 30 mA
• Pressure gauge capable of a digital readout up to 50 psig
with an accuracy of 0.1%
• Digital volt meter capable of a readout up to 30 mA with
an accuracy of .02%.
The following adjustments are provided:
• Full Range Operation
• Lo/Hi Span
• Forward/ReverseMode
• Calibration - Zero and Span
• Split Range Operation
• DampingAdjustments.
FULL-RANGEOPERATION
Lo/Hi Span Adjustment
1. Set the Lo/Hi Span Jumper to the Lo position for 3-15
psig output range. Set the Lo/Hi Span Jumper to the
Hi position for 3-27 or 6-30 psig output range. For
more information, see Table 3.
Forward Acting Mode Adjustment
2. Set Fwd/Rev Mode Jumper to Forward position.
• Forward Acting Calibration - Zero
3. Apply the minimum input signal and adjust the Zero
Adjustment for minimum output pressure.
• Forward Acting Calibration - Span
4. Apply the maximum input signal and adjust the Span
Adjustment for maximum output pressure.
5. Repeat steps 3 and 4 until the desired output range is
obtained.
Reverse Acting Mode Adjustment
NOTE: Do NOT reverse the input leads.
6. Set Fwd/Rev Mode Jumper to the Reverse position.
• Reverse Acting Calibration - Zero
7. Apply the maximum input signal and adjust the Zero
Adjustment for minimum output pressure.
• Reverse Acting Calibration - Span
8. Apply the minimum input signal and adjust the Span
Adjustment for maximum output pressure.
9. Repeat steps 7and 8 until the desired output range is
obtained.
SPLIT-RANGE OPERATION
Lo/Hi Span Adjustment
1. Set the Lo/Hi Span switch to the Lo position for 3-9
psig or 9-15 psig output range and for 4-20 mA input
range. Set the Lo/Hi Span Switch to the Hi position
for 3-15 psig output range for 4-12 mA or 12-20 mA
input range. For more information, see Table 4.
Forward Acting Mode Adjustment
2. Set Fwd/Rev Mode Jumper to the Forward position.
• Forward Acting Calibration - Zero
3. Apply the minimum input signal and adjust the Zero
Adjustment for minimum output pressure.
• Forward Acting Calibration - Span
4. Apply the maximum input signal and adjust the Span
Adjustment for maximum output pressure.
5. Repeat steps 3 and 4 until the desired output range is
obtained.
Reverse Acting Mode Adjustment
NOTE: Do NOT reverse the input leads.
6. Set Fwd/Rev Mode Jumper to the Reverse position.
• Reverse Acting Calibration - Zero
7. Apply the maximum input signal and adjust the Zero
Adjustment for minimum output pressure.
• Reverse Acting Calibration - Span
8. Apply the minimum input signal and adjust the Span
Adjustment for maximum output pressure.
9. Repeat steps 7 and 8 until the desired output range is
obtained.
Additional Adjustments
• Damping Adjustment
The DampingAdjustment lets you tune the transducer for
optimum response and stability in a particular application.
For best performance, start the Damping Adjustment at
maximum adjustment, fully clockwise. Gradually turn
counterclockwise until slight oscillation occurs. Turn
back clockwise until oscillation is minimized. For more
information, see Figure 10.
1. Turn Damping Adjustment clockwise to increase
damping function.
2. Turn Damping Adjustment counterclockwise to
decrease damping function.
7

Calibrations / Adjustments (continued)
Figure 10. T7800 Calibration Configuration
8

COMPONENTS
Figure 11. Exploded Drawing
1
2
2
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
2
Table 5. T7800 Transducer Components
Description
1
2
3
4 1
5
6 1
7
8 1
9 1
10
11 1
12 1
13
14
15
16
17 1
18
19
Qty.
Cover, Machining
Screw
Screw
Gasket
Nozzle Body Assembly
Orifice Assembly
Spring
Disk
Diaphragm
Spacer Ring
Diaphragm Assembly
Foam Block
Valve Body Assembly
Screw
Pintle
Spring, PIntle
O-Ring
Plug
Screw
119267-1 Service Kit Components.
3-15, 3-27, 6-30 psig
[0.2-1.0, 0.2-1.8, 0.4-2.0 BAR]
(20-100, 20-180, 40-200 kPa)
Item
9

MAINTENANCE TROUBLESHOOTING
Table 6. Troubleshooting
Problem Solution (check)
No output • Supply pressure
• Clogged orifice
Leakage • Connections
Low or improper
Span adjust • Zero and Span adjust
• Low supply pressure
• Output leakage
Erratic operation • DC signal
• Loose wires or connections
• Liquid in air supply
To clean the Orifice, use the following procedure:
1. Shut off the valve that supplies air to transducer. It is
not necessary to remove the Transducer from the
air line.
2. Remove the Orifice Assembly (6) from the unit. For
more information, see Figure 11.
3. Clean with alcohol and dry with compressed air.
NOTES: 1. Parts must be completely dry before
reassembling.
2. If the standard maintenance procedure
does not correct the problem, install the
appropriate service kit.
WARNING: Transducer failure could result in output
pressure increasing to supply pressure
and 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.
IS-50T7800S
Litho in USA
Rev. H 09/05