Document 9162
Manual - ST5484E 2-Wire Seismic Vibration Transmitter
Page 3 of 7
Rev. T (Oct 2013)
3.2 Intrinsically Safe Installation In Hazardous Locations
Connect the field 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. These drawings are available for download from www.metrixvibration.com. The
leads must be terminated inside an enclosure that affords a degree of protection of at least IP20. Metrix elbow 8200-001
may be used for these purposes. Refer to datasheet 1004457 for additional details on accessories. The ambient temperature
range is -40° to 100°C. The transmitter requires a minimum of 11 VDC for proper operation. The voltage drop across the
specified non-isolated barriers with a 20 mA loop current is 8.1 VDC.
The minimum loop power supply voltage required is 19.1 VDC plus 1 volt for each 50 ohms of loop resistance. The maximum
loop power supply voltage that may be applied to the safety barrier is 26 VDC. Therefore, the maximum loop resistance with
a 26 VDC supply is 345 ohms.
Example:
Component
Resistance
Signal wiring
5 ohms
DC Input Impedance of receiver
100 ohms
TOTAL LOOP RESISTANCE
105 ohms
Minimum supply voltage =
105 (1V/50 ohms) + 19.1 V = 21.2 VDC
3.3 Explosion-Proof Installation In Hazardous Locations (CSA)
ST5484E transmitters are CSA certified explosion-proof, Class I (B, C & D); Class II (E, F & G,). Connect the field wiring in
accordance with the appropriate portion of Figure 1. Refer to paragraph 3.1 for loop voltage and resistance requirements.
All conduit and junction boxes used must be certified explosion-proof for the class, division, and group required by the
application. Installation of the transmitter must meet all of the explosion-proof installation requirements of the local
governing agency and facility safety procedures.
3.4 Flame-Proof Installation In Hazardous Locations (ATEX, IECEX)
ST5484E transmitters are ATEX/IECEx certified flame-proof, Ex d IIC T4 Gb. Connect the field wiring in accordance with the
appropriate portion of Figure 1. Refer to paragraph 3.1 for loop voltage and resistance requirements. All conduit and
junction boxes used must be certified flame-proof for the area required by the application. Installation of the transmitter
must meet all of the flame-proof requirements of the local governing agency and facility safety procedures. The 8200-001-IEC
elbow is required to meet this approval.
ATEX Conditions for Safe Use:
In order to ensure temperature classification and safety, the power supply should adhere to the following:
Uo ≤ 30V, Io ≤ 100mA, and Po ≤ 0.75W
Ambient Operating Temperature: -40°C to +100°C
