Hazardous Area Classification - Fairchild T7800 Serie Instrucciones De Instalación, Uso Y Mantenimiento

MAINTENANCE
To clean the Orifice, use the following procedure:
1. Shut off the valve that is supplying 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 detailed information see Figure 11. "Exploded
Drawing" on page 6.
3. Clean with alcohol and dry with compressed air.
NOTES:
Parts must be completely dry before reassembling.
If the standard maintenance procedure does not
correct the trouble, install Service Kit.

HAZARDOUS AREA CLASSIFICATION

FM (Factory Mutual) Approvals:
Intrinsically Safe:
Catalog Versions: TAFI7800, TDFI7800
Class I,II,III Div 1 Groups CDEFG T4
ED-18970; Entity
I/O AEx ia IIB T4
-40°C to +80°C
Non-Incendive:
Class I,II,III Div 2 Groups ABCDEFG T6
ED-18970; NIFW
-40°C to +80°C
Enclosure Type 4X
Intrinsically Safe:
Catalog Versions: TTFI7800, TRFI7800
Class I,II,III Div 1 Groups CD T4
ED-18970; Entity
I/O AEx ia IIB T4
-40°C to +80°C
Non-Incendive:
Class I,II,III Div 2 Groups ABCD T6
ED-18970; NIFW
-40°C to +80°C
Entity Parameters
1
Vmax = 28VDC
2
Imax = 100mA
3
Pmax = 0.7W
1
Vmax = Maximum Voltage
2
Imax = Maximum Current
3
Pmax = Maximum Power
Nonincendive Field Wire Parameters (NIFW)
1
Vmax = 30VDC
2
Imax = 120mA
1
Vmax = Maximum Voltage
2
Imax = Maximum Current
4
Ci = 12nF
5
Li = 0mH
4
Ci = Capacitance
5
Li = Inductance
3
Ci = 0uF
4
Li = 0mH
3
Ci = Capacitance
4
Li = Inductance
TROUBLE-SHOOTING
Table 6. Trouble-Shooting.
Problem
No Output
Leakage
Low or Improper
Span Adjust
Erratic Operation
WARNING: Failure of Transducer could result in output
pressure increasing to supply pressure
possibly causing personal injury or damage
to equipment.
CSA (Canadian Standards Association) Approvals:
Intrinsically Safe: (4-20 mA only)
(TDCI7800, TACI7800)
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)
Class I, Division 1, Groups C and D;
Temperature Code T6.
Approvals are valid when connected through a Shunt
Zener Diode Safety Barrier meeting the following
parametric requirements:
System
Single Channel Polarized Rated: 28.5V
Type 1:
Max. 300 Ohm Min.
Dual Channel Polarized Rated: 28.5V Max.
System
300 Ohm Min. and 10V Max. 50 Ohm Min.
Type 2:
System
Dual Channel Polarized Rated: 28.5V Max. 300
Type 3:
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.
HAZARDOUS AREA CLASSIFICATION
CONTINUED ON THE NEXT PAGE
7
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