EXPO D760-ET MiniPurge, Manual

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ML548 | v11
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Section 1: System Specification
Conditions of Safe Operation
The D760 design permits system operation in external ambient temperatures down to -60°C. Installation &
safe use requires the internal heater to be connected to maintain both the internal ambient temperature and
the temperature of the logic air supply above -20°C. Temperature sensors are provided for user connection, and
it is the users responsibility to not initiate purge unless these temperature conditions are met.
Temperature sensors (PT100 RTDs) are provided for user monitoring of internal ambient temperature and logic
air supply temperature. The individual sensors are each 4-wire devices with all 4 wires brought to terminals in
the system junction box. The RTDs are to be treated as 'simple apparatus' intrinsically safe components - see
EXPO 20MDOC1403X as attached. Users may decide to connect RTD monitoring circuits as 2-, 3- or 4-wire
circuits as preferred. The temperature monitoring circuits themselves are provided by others.
If the logic air supply temperature falls below -10°C, this should be investigated and rectified. If the logic air
supply falls below -20°C, the purge system will be operating outside of its certification parameters and should
be stopped. The purge system can only be re-initiated when the logic air supply is above -20°C.
If the internal ambient temperature falls below -20°C, this should be investigated and rectified.
5 X LC / ss / ET / OV / PA / PC / LT
Size
5 = MiniPurge
®
Purge flow rate:
2000 - 6000 NI/min
Approval / Certification
Sira 01ATEX1295X
2813 II 2(2) G
Ex [pxb] db e ia IIC T4 Gb
T
amb
-60ºC to +55ºC
IECEx SIR07.0027X
Ex [pxb] db e ia IIC T4 Gb
T
amb
-60ºC to +55ºC
PC
= Pressurized Control. Automatic
leakage compensation (CLAPS)
OV = Purge Outlet Valve is pneumatically
operated
Timing Method
ET
= Electronic Timer
MiniPurge
®
Housing
ss = Stainless Steel 316L
Pressurization Method
LC
= Leakage Compensation
ATEX Certificate:
IECEx Certificate:
PA = Power and Alarm Switches.
Integral /PA Terminal Box
LT = Low Temperature
2020312304000830
Ex [px] d e ia IIC T4 Gb
T
amb
-60ºC to +55ºC
CCC Certificate:
EAC Certificate:
ЕАЭС RU С-GB.АЖ58.В.00906/20
1Ex [px] d e mb ia IIC T4 Gb
(-60°C ≤ T
amb
≤ +55°C)
CSAE 21UKEX1067X
2813 II 2(2) G
Ex [pxb] db e ia IIC T4 Gb
T
amb
-60ºC to +55ºC
UKEX Certificate: