Hach 48685, Руководство пользователя

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3. Finger tighten the nut. Use a 9/16" wrench to hold the adapter fitting and a second 9/16" wrench
to tighten the nut 1¼ turns.
Note: Never tighten the tubing nut without holding the hex portion of the tubing adapter.
Test the sample connections
Make sure that all the tubing connections are correct. Switch the sample on and gradually increase
flow through the instrument. Make sure that no leaks exist. If leaks exist, tighten the connections in
small increments. If a leak continues, loosen the fitting. Make sure that the ferrule is correctly
installed and the fitting contains no foreign material. Tighten the fitting again.
Connect to AC power
D A N G E R
Potential Electrocution Hazard. Only qualified personnel should conduct the tasks described in this
section of the manual.
D A N G E R
To meet UL, CSA and other applicable instrument safety standards, an external power disconnect switch must be
installed. Install the device in a location and position that gives easy access to the disconnect device and its
operation.
D A N G E R
Connect equipment in accordance with local, state, and national electrical codes.
Table 1 Power configuration and approved use by model number
Sample heater model number Power connections Approved use
48685-00 (48685-60 on reference serial
number label) 115 VAC, 50/60 Hz line power
Note: The 115 VAC model cannot be
modified for 230 VAC operation.
United States, Canada
48685-02 (48685-62 on reference serial
number label) 230 VAC, 50/60 Hz line power for
single phase (with grounded neutral)
only United States, Canada,
European Community and
other countries with 230 V
single phase
Wire the instrument
The instrument is designed to be hard-wired. A ½" NPT conduit opening (
7
/
8
" diameter) is provided
for electrical connection. Use the correct sealing hardware to keep the NEMA 4 rating.
Note: Do not apply power to the heater until sample flow has been established and sample is in the heater tubing.
Sample must be flowing through the heater at all times when the heater is on.
Requirements for the power cord installation
To use a power cord for the connection to AC mains, make sure that the:
• Cord is less than 3 m (9 ft) in length
• Cord wire gauge is less than 16 AWG
• Outer power cord insulation is suitable for end use location
• Cord has a 3-circuit cord plug that has a ground connection that is necessary for a supply
connection
• Cord wires have the correct size of spade tongue terminals on the connection end. The terminals
must have insulated barrels.
• Cord has a cord cable gland that has the correct rating for the installation location. The cable gland
must attach the cord and seal to the enclosure to keep environmental ratings within specifications.
• Cord plug serves as the power supply disconnect. Make sure that it is close to the instrument and
easily accessible by the operator.
English 11