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ML548_ES | v3
Expo Technologies UK
T: +44 (0) 20 8398 8011
Expo Technologies US
T: +1 (440) 247 5314
Expo Technologies China
T: +86 532 8906 9858
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 / ES / 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
PA
= Power and Alarm Switches.
Integral /PA Terminal Box
OV
= Purge Outlet Valve is pneumatically
operated
Timing Method
ES
= Electronic Timer powered by an EPPS
(Electo-Pneumatic Power Supply)
MiniPurge
®
Housing
ss
= Stainless Steel 316L
Pressurization Method
LC
= Leakage Compensation
ATEX Certificate:
IECEx Certificate:
PC
= Pressurized Control. Automatic
leakage compensation (CLAPS)
LT
= Low Temperature
