<2. Notes on Handling>
2-10
IM 01C50B01-01E
2.7.3 FM Certification
a) FM Intrinsically Safe Type
Caution for FM Intrinsically safe type.
Note 1. Model YTA /FU1 temperature transmitter is
applicable for use in hazardous locations.
• Applicable Standard: FM 3600, FM 3610,
FM 3611, FM 3810, NEMA-250
• Intrinsically Safe for Class I, Division 1, Groups
A, B, C & D.
Class II, Division 1, Groups E, F & G and Class
III, Division 1 Hazardous Locations.
• Outdoor hazardous locations, NEMA 4X.
• Temperature Class: T4
• Ambient temperature: –40 to 60°C
Note 2. Entity Parameters of the temperature
transmitter:
• Supply Circuit (+ and –) • Sensor Circuit (1 to 5)
Vmax : 30 V
Voc/Vt : 9 V
Imax : 165 mA
Isc/It : 40 mA
Pmax : 0.9 W
Po : 0.09 W
Ci : 18 nF
Ca : 1 μF
Li : 730 μH
La : 10 mH
• For the sensor input circuitry, these entity
parameters must be taken into account when
installed.
• Installation Requirements between temperature
transmitter and safety barrier:
Voc ≤ Vmax, Isc ≤ Imax, Ca ≥ Ci + Ccable, La ≥
Li + Lcable
Voc, Isc, Ca and La are parameters of the
safety barrier.
Note 3. Installation
• The safety barrier must be FM approved.
• Input voltage of the safety barrier must be less
than 250 Vrms/Vdc.
• Installation should be in accordance with ANSI/
ISA RP12.6 “Installation of Intrinsically Safe
Systems for Hazardous (Classified) Locations”
and the National Electric Code (ANSI/NFPA
70).
• Intrinsically safe sensor must be FMRC
Approved or be simple apparatus (a device
which will neither generate nor store more than
1.2 V, 0.1 A, 25 mW or 20 μJ, ex. switches,
thermocouples, LED’s or RTD’s).
• Dust-tight conduit seal must be used when
installed in a Class II and III environments.
Note 4. Maintenance and Repair
• The instrument modification or parts
replacement by other than authorized
representative of Yokogawa Electric
Corporation is prohibited and will void Factory
Mutual Intrinsically safe and Nonincendive
Approval.
F0209.ai
Class I, II, III, Division 1,
Groups A, B, C, D, E, F and G
Temperature
Transmitter
Safety Barrier
Hazardous
Location
Nonhazardous
Location
General
Purpose
Equipment
+
–
+ –
+
–
C
+
–
[Intrinsically Safe]
Supply
1
2
3
4
5
Sensor
Intrinsically
Safe Sensor
or Simple
Apparatus
b) FM Non-incendive Type
Caution for FM Non-incendive type.
Note 1. Model YTA /FU1 temperature transmitter is
applicable for use in hazardous locations.
• Applicable Standard: FM 3600, FM 3610,
FM 3611, FM 3810, NEMA-250
• Non-incendive for Class I, Division 2, Groups A,
B, C & D.
Class II, Division 2, Groups F & G and Class III,
Division 1 Hazardous Locations.
• Outdoor hazardous locations, NEMA 4X.
• Temperature Class: T4
• Ambient temperature: –40 to 60°C
Note 2. Non-incendive field wiring Parameters of
the temperature transmitter:
• Supply Circuit (+ and -) • Sensor Circuit (1 to 5)
Vmax : 30 V
Voc/Vt : 9 V
Imax : 165 mA
Isc/It : 40 mA
Pmax : 0.9 W
Po : 0.09 W
Ci : 18 nF
Ca : 1 μF
Li : 730 μH
La : 10 mH
