Fairchild T7800 Installation, Operation And Maintanance Manual

FAIRCHILD T7800 STANDARD RANGE

MINIATURE ELECTRO-PNEUMATIC TRANSDUCER

Installation, Operation and Maintenance Instructions

Identification Number

Electrical Connections

1/2 NPT Conduit

Fitting with Pigtail
Terminal Block
DIN 43650 Connection
Rack Mount

Underwriting Group

Factory Mutual
Canadian Standard
ATEX

Approval Class

Intrinsically Safe
Non-Incendive (Division 2)

Input

4-20mA
1-5 VDC
0-5 VDC
1-9 VDC
0-10 VDC

Output

Select appropriate psig, [BAR] or (kPa).

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)

1

Intrinsically Safe approval, including non-incendive

(Division 2), on 4-20 mA units only.

2

Non-incendive (Division 2) approval on FM voltage

input units only.

T

(A)

(T)
(D)
(R)

(F)
(C)
(E)

1

2

I

()

(N)

7800 -

(4)
(5)
(7)
(9)
(0)

(01)
(02)
(03)

(11)
(12)
(13)

(21)
(22)
(23)

Figure 1. Model T7800 Standard Range Transducer Identification Number System

GENERAL INFORMATION

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

SPECIFICATIONS

Functional Specifications

Output
Range

Input
Range

Supply
Pressure

Minimum
Span

psig

[BAR]

(kPa)

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)

psig

[BAR]

(kPa)

3-27
[0.2-1.8]
(20-180)

32-120

[2.2-8.0]

(220-800)

10

[0.7]

(70)

psig

[BAR]

(kPa)

6-30
[0.4-2.0]
(40-200)

35-120

[2.4-8.0]

(240-800)

10

[0.7]

(70)

Air Con­sumption

All Ranges
(SCFH)

Flow Rate
(SCFM)

Temperature
Range

S pan/Zero
Adjustments

Required
Operating
Voltages

Supply
Voltage

Signal
Impedance

1

Set Point

3 psig

[0.2 BAR]

(20 kPa)

3.5

3

(.10 m /HR)

2.5 (4.25m /HR) @
25 psig, [1.7 BAR],
(170 kPa) supply &

9 psig, [0.6 BAR],

(60 kPa) output.

Operating.....................

Storage .....................

Screwdriver adjustments located on front

of unit

Two Wire Current Input

7.2 VDC @ 20 mA (4-20 mA signal)

Three Wire Voltage Input

7-30 VDC, less than 3 mA

Three Wire Voltage Input

10 Kilohms

9 psig

[0.6 BAR]

(60 kPa)

7.0

3

(.20 m /HR)

3

15 psig

[1.0 BAR]

(100 kPa)

9.5

3

(.27 m /HR)

9.0 (15.3m /HR) @

120 psig, [8.0 BAR],

(800 kPa) supply &

or

9 psig, [0.6 BAR],

(60 kPa) output.

-40 F to +160 F
(-40 C to +71.2 C)

-40 F to +180 F
(-40 C to +82.2 C)

(.38 m /HR)

30 psig
[2.0 BAR]
(200 kPa)

13.5

3

3

Specifications (continued)

Performance Specifications

Accuracy
(ISA S51.1)

Hysteresis
(ISA S51.1)

Deadband

Repeatability

(ISA S51.1)

Position
Effect

Vibration
Effect

Reverse
Polarity
Protection

RFI/EMI
Effect

Supply
Pressure

Effect

Temperature
Effect

Frequency
Response

Materials of
Construction

+ + 0.25% Full Scale Guaranteed

0.15% Full Scale Typical

0.1% Full Scale

0.02% Full Scale

0.1% Full Scale

No measurable effect

Less than 1% of Span under the following

+
conditions: 5-15 Hz @ 0.8 inches constant
displacement 15-500 Hz @ 10 g's.

No damage occurs from reversal of normal
supply current (4-20 mA) or from mis­application of up to 60 mA.

Less than 0.5% of span @ 30 /m class 3 Band

v

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.

No measurable effect

[0.5% +0.04% / F Temperature Change] of

+

-

Span guaranteed

psig

[BAR]

(kPa)

3-15
[0.2-1.0]
(20-100)

-3 db@5Hzper ISA S26.4.3.1

Body and Housing.......

Orifice...............

Trim.....................

Elastomers......................

Finish.............

psig

[BAR]

(kPa)

3-27
[0.2-1.8]
(20-180)

load configuration A.

Chromate Treated

Nickel Plated Brass

Stainless Steel

Brass & Zinc Plated Steel

Epoxy Powder Coating

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.

Entity Parameters

1

Vmax

2

Imax

1

Vmax = Maximum Voltage

2

Imax = Maximum Current

=
=

30 VDC
200 mA

3

Ci

4

Li

3

Ci = Capacitance

4

Li = Inductance

v

psig

[BAR]

(kPa)

6-30
[0.4-2.0]
(40-200)

Aluminum

& Sapphire

Nitrile

0 F
0 mH

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 Code T6.

(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 require­ments shown in the following table.

Parametric Requirements

System

Type 1:

System

Type 2:

System

Type 3:

Single Channel Polarized Rated: 28.5V Max.
300 Ohm Min.

Dual Channel Polarized Rated: 28.5V Max. 300
Ohm Min. and 10V Max. 50 Ohm Min.

Dual Channel Polarized Rated: 28.5V Max. 300
Ohm Min. and 28V Diode return per channel.

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.

ATEX Approvals:

Intrinsically Safe: (4-20 mA only)

(TAEI7800, TDEI7800, TTEI7800, TREI7800)

EEx ia IIB, T4 (-200 C to +720 C) ambient

II 1G (T4)

(TAEI7800, TDEI7800)

IP65 Enclosure

Transducer Parameters

1

Umax
Imax

1

Umax = Maximum Voltage

2

Imax = Maximum Current

=
=

28 V
100 mA

2

3

4

5

3

Wmax

4

Ceq

5

Leq

Wmax = Maximum Power
Ceq = Capacitance
Leq = Inductance

=
=
=

0.7 W
0
0

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

The enclosure is manufactured from aluminum alloy. In rare
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.

3 23/32

94.5

Outlet

1 33/64

38.7

Z

OUT

IN

S

Orifice

Inlet

1/2-14

NPT

3 5/32

80.3

3 3/64

77.5

2 1/4

57.1

Figure 2. TA7800 Outline Dimensions

Vent

25/32

19.7

1

25.4

1/2

12.7
Use two
10-32
Screws for
mounting

2 3/64

51.8

OUT IN

25/64

9.8

Figure 3. Mounting Kit 16799-1 (included with unit)

3

Installation (continued)

Figure 4. TT7800 Outline Dimensions

Figure 5. TD7800 Outline Dimensions

Figure 6. TR7800 Outline Dimensions

4

Figure 7. Din Rail Mounting Kit 16893-1 (included with unit)

Figure 8. Optional Mounting Kit 19254-1 (sold separately)

5

Pneumatic Connections

Electrical Connections

Clean all pipelines to remove dirt and scale before installa­tion.

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 trans­ducer. 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.

Make connections to the Terminal Block, Conduit Connec­tor 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

U.S. FM

ANSI/ISA RP 12.6

Code

ANSI/NFPA 70
Canada
Europe

CSA
ATEX

CED Part 1

EN 50 039, EN 60079-14,

IEC 60079-14

Intrinsically Safe Connections

For more information, see the latest revisions of the draw­ings listed in Table 2.

Table 2. Intrinsically Safe Connections

Underwriting Group Drawing Number

FM (Factory Mutual)
CSA (Canadian Standards)
ATEX

EC-18970
EC-18971
EC-18972

Figure 9. Electrical Connections

6

CALIBRATIONS / ADJUSTMENTS

SPLIT-RANGE OPERATION

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/Reverse Mode

• Calibration - Zero and Span

• Split Range Operation

• Damping Adjustments.

FULL-RANGE OPERATION

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.

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

Apply the minimum input signal and adjust the Zero

3.

Adjustment for minimum output pressure.

• Forward Acting Calibration - Span

Apply the maximum input signal and adjust the Span

4.

Adjustment for maximum output pressure.

Repeat steps 3 and 4 until the desired output range is

5.

obtained.

Reverse Acting Mode Adjustment

NOTE:

Do NOT reverse the input leads.

Forward Acting Mode Adjustment

Set Fwd/Rev Mode Jumper to Forward position.

2.

• Forward Acting Calibration - Zero

Apply the minimum input signal and adjust the Zero

3.

Adjustment for minimum output pressure.

• Forward Acting Calibration - Span

Apply the maximum input signal and adjust the Span

4.

Adjustment for maximum output pressure.

Repeat steps 3 and 4 until the desired output range is

5.

obtained.

Reverse Acting Mode Adjustment

NOTE:

6.

Do NOT reverse the input leads.

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

Apply the minimum input signal and adjust the Span

8.

Adjustment for maximum output pressure.

Set Fwd/Rev Mode Jumper to the Reverse position.

6.

• Reverse Acting Calibration - Zero

7. Apply the maximum input signal and adjust the Zero

Adjustment for minimum output pressure.

• Reverse Acting Calibration - Span

Apply the minimum input signal and adjust the Span

8.

Adjustment for maximum output pressure.

Repeat steps 7 and 8 until the desired output range is

9.

obtained.

Additional Adjustments

• Damping Adjustment

The Damping Adjustment 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.

Repeat steps 7and 8 until the desired output range is

9.

obtained.

7

2.

Turn Damping Adjustment counterclockwise to
decrease damping function.

Calibrations / Adjustments (continued)

Figure 10. T7800 Calibration Configuration

8

COMPONENTS

Table 5. T7800 Transducer Components

Item

Qty.

Description

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

1

19267-1 Service Kit Components.

[0.2-1.0, 0.2-1.8, 0.4-2.0 BAR]

(20-100, 20-180, 40-200 kPa)

1

Cover, Machining

2

Screw

2

1

1

1
1

1
1

1

3-15, 3-27, 6-30 psig

Screw

1

Gasket

1

Nozzle Body Assembly

1

Orifice Assembly

1

Spring

1

Disk

1

Diaphragm

1

Spacer Ring

1

Diaphragm Assembly

1

Foam Block

1

Valve Body Assembly

3

Screw

1

Pintle

1

Spring, PIntle

1

O-Ring

1

Plug

2

Screw

Figure 11. Exploded Drawing

9

MAINTENANCE

TROUBLESHOOTING

To clean the Orifice, use the following procedure:

Shut off the valve that supplies air to transducer. It is

1.
not necessary to remove the Transducer from the
air line.

Remove the Orifice Assembly (6) from the unit. For

2.

more information, see Figure 11.

Clean with alcohol and dry with compressed air.

3.

Parts must be completely dry before

NOTES:

1.
reassembling.

If the standard maintenance procedure

2.
does not correct the problem, install the
appropriate service kit.

Table 6. Troubleshooting

Problem

No output

Leakage

Low or improper
Span adjust

Erratic operation

WARNING:

Transducer failure could result in output
pressure increasing to supply pressure
and possibly causing personal injury or
damage to equipment.

Solution (check)

• Supply pressure

• Clogged orifice

• Connections

• Zero and Span adjust

• Low supply pressure

• Output leakage

• DC signal

• Loose wires or connections

• Liquid in air supply

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