Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
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<strong>E2M28</strong> <strong>and</strong> <strong>E2M30</strong> <strong>Rotary</strong> <strong>Vacuum</strong> <strong>Pumps</strong><br />
4.5 To pump cond<strong>en</strong>sable vapours<br />
PAGE<br />
26<br />
Use gas-ballast (op<strong>en</strong> the gas-ballast control) wh<strong>en</strong> there is a high proportion of cond<strong>en</strong>sable vapours in<br />
the process gases:<br />
OPERATION<br />
1. Close the vacuum system isolation-valve.<br />
2. Turn the gas-ballast control anti-clockwise to fully op<strong>en</strong> <strong>and</strong> operate the pump for 30 minutes to<br />
warm the oil; this will help to prev<strong>en</strong>t vapour cond<strong>en</strong>sation in the pump.<br />
3. Op<strong>en</strong> the vacuum system isolation-valve <strong>and</strong> continue to operate the pump with the gas-ballast<br />
control op<strong>en</strong>.<br />
After you have pumped cond<strong>en</strong>sable vapours, you can (if necessary) decontaminate the oil; use the<br />
procedure in Section 4.6.<br />
4.6 To decontaminate the oil<br />
The oil in the pump should be clear, if the oil is cloudy or discoloured, it is contaminated with process<br />
vapours.<br />
1. Look at the condition of the oil in the oil sight-glass (Figure 1, item 12). If the oil is cloudy or<br />
discoloured, continue with the procedure at Step 2 below.<br />
2. Close the vacuum system isolation-valve.<br />
3. Turn the gas-ballast control fully anti-clockwise.<br />
4. Operate the pump until the oil is clear.<br />
4.7 Unatt<strong>en</strong>ded operation<br />
The pump is designed for unatt<strong>en</strong>ded operation under the normal operating conditions specified in<br />
Section 2.1. However, we recomm<strong>en</strong>d that you check the pump at a regular interval of not more than<br />
14 days; check the pump more frequ<strong>en</strong>tly if you pump high volumes of gas or if you operate the pump<br />
with the gas-ballast control op<strong>en</strong>.<br />
Single-phase motors are cooled by internal fans. These motors have a thermal overload device. Wh<strong>en</strong><br />
the motor is too hot, the thermal overload device switches off the pump. The thermal overload device<br />
has an automatic reset; wh<strong>en</strong> the motor cools down, the device resets <strong>and</strong> the motor will restart.<br />
Wh<strong>en</strong> you check the pump, make sure that the pump is not going through a repetitive cycle of thermal<br />
overload failures <strong>and</strong> automatic resets. If necessary reduce the thermal load from the pumped gases, to<br />
prev<strong>en</strong>t overheating of the pump.<br />
Issue K 26 Jul 05
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