Metrix ST5484E Installation Manual

Doc# M9162• REV AB (April 2019) Page 3 of 12
Example:
Component Resistance
Signal wiring 10 W
DC Input Impedance of receiver 250 W
TOTAL LOOP RESISTANCE 260 W
Minimum supply voltage = 260 W (1 V/50 W) + 11 V = 16.2 VDC
The maximum loop power supply voltage that may be applied is 29.6 VDC (intrinsically safe)
or 30VDC (explosion proof and non-incendive). The maximum loop resistance (RL) is calcu-
lated by the equaon: RL = 50 (VS - 11) W
Example: RL = 50 (24 - 11) = 650 W for a 24 VDC loop supply.
3.2 Intrinsically Safe Installaon In Hazardous Locaons
Connect the eld wiring in accordance with Metrix drawing 9426 for CSA Class I, (A,B,C &
D) and Metrix drawing 9278 for IECEx / ATEX (Ex ia IIC T4 Ga) approvals. The leads must be
terminated inside an enclosure with a degree of protecon of at least IP20. A Metrix elbow
from the 8200 series may be used for these purposes. Refer to Metrix Datasheet 1004457
for addional details on accessories. The ambient temperature range is -40°C to 100°C.
The transmier requires a minimum of 11 VDC for proper operaon. The voltage drop
across the specied non-isolated barriers with a 20 mA loop current is 8.1 VDC. As such, The
minimum loop power supply voltage required is 19.1 VDC plus 1 volt for each 50 W of loop
resistance. The maximum loop power supply voltage that may be applied to the safety bar-
rier is 26 VDC. Therefore, the maximum loop resistance with a 26 VDC supply is 345 W.
Example:
Component Resistance
Signal wiring 5 W
DC Input Impedance of receiver 100 W
TOTAL LOOP RESISTANCE 105 W
Minimum supply voltage = 105 (1 V/50 W) + 19.1 V = 21.2 VDC
3.3 Explosion-Proof Installaon In Hazardous Locaons (CSA)
Some models of ST5484E transmiers are CSA cered explosion-proof, CSA US/C, Class I,
Div 1, Grps B-D and Class II, Div 1, Grps E-G (explosion proof). Connect the eld wiring in ac-
cordance with the appropriate poron of Figure 1. Refer to secon 3.1 for loop voltage and
resistance requirements. All conduit and juncon boxes used must be cered explosion-
proof for the class, division, and group required by the applicaon. Installaon of the trans-
mier must meet all of the explosion-proof installaon requirements of the local governing
agency and facility safety procedures.
3.4 Flame-Proof Installaon In Hazardous Locaons (ATEX, IECEX)
Some models of ST5484E transmiers are ATEX/IECEx cered ame-proof, Ex d IIC T4 Gb. Con-
nect the eld wiring in accordance with the appropriate poron of Figure 1. Refer to secon
3.1 for loop voltage and resistance requirements. All conduit and juncon boxes used must be
cered ame-proof for the area required by the applicaon. Installaon of the transmier
must meet all of the ame-proof requirements of the local governing agency and facility safety
procedures. The Metrix part 8200-001-IEC elbow is required to meet this approval.

Metrix ST5484E Specifications

General

Brand	Metrix
Model	ST5484E
Category	Transmitter
Language	English