2.38
Maximum ratings of the relay contacts on the flow alarm unit are:
8A at up to 250 V ac
1A at up to 250 V dc
The unit will alarm when the flow is less than approximately 40ml/min. The alarm is self
cancelling when the flow increases.
WARNING
The flow alarm unit is not suitable for use in hazardous areas or with
potentially explosive sample gases.
2.13 TRANSDUCER UNIT DILUTION PURGE
If corrosive sample gases are being measured it is recommended that the Transducer unit is
fitted with the optional dilution purge (01100996). This reduces the possibility of damage
should the sample leak.
This is not available with 1100H systems using the 1132 Transducer.
The dilution purge should be specified at the time of ordering. It cannot be fitted in the field.
Gas purge connections are made to the marked 1/8 in o.d. tubes on the base of the
Transducer unit.
Clean dry air or inert gas should be used for purging at a flow rate of 100 to 200 ml/min.
2.14 EFFECT OF ELECTRICAL INTERFERENCE
Good installation procedures should minimise the electrical interference to which the 1100A
may be subjected. The analyser will work within specification with supply voltage reduced by
10% and has been tested not to malfunction at -15%. If the supply voltage drops by 20% to
30% of the nominal, this will be detected and the microprocessor will perform a restart. Such
short term reductions can be due to the starting of large electric motors or supply faults.
If high levels of interference are present it is recommended that filters are fitted to the incoming
electrical supply. A suitable filter is available from Servomex, part no. 01100981 (BASEEFA
and FM approved) or 01100959 (CSA approved). Connections to the relay board for alarms or
auto-calibration should be suppressed as necessary or spark suppressors or diodes fitted.
To Next Page
Loading...
Need help?
General
