
Transmitter M300 11
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
The following is a list of general safety instructions and warnings. Failure to adhere to these in-
structions can result in damage to the equipment and/or personal injury to the operator.
– The M300 Transmitter should be installed and operated only by personnel familiar with
the transmitter and who are qualified for such work.
– The M300 Transmitter must only be operated under the specified operating conditions
(see section 16).
– Repair of the M300 Transmitter must be performed by authorized, trained personnel only.
– With the exception of routine maintenance, cleaning procedures or fuse replacement, as de-
scribed in this manual, the M300 Transmitter must not be tampered with or altered in
any manner.
– Mettler-Toledo accepts no responsibility for damage caused by unauthorized modifications
to the transmitter.
– Follow all warnings, cautions, and instructions indicated on and supplied with this product.
– Install equipment as specified in this instruction manual. Follow appropriate local and na-
tional codes.
– Protective covers must be in place at all times during normal operation.
– If this equipment is used in a manner not specified by the manufacturer, the protection pro-
vided by it against hazards may be impaired.
WARNINGS:
Installation of cable connections and servicing of this product require access to shock hazard
voltage levels.
Main power and relay contacts wired to separate power source must be disconnected before
servicing.
Switch or circuit breaker shall be in close proximity to the equipment and within easy reach of
the OPERATOR; it shall be marked as the disconnecting device for the equipment.
Main power must employ a switch or circuit breaker as the disconnecting device for the equip-
ment.
Electrical installation must be in accordance with the National Electrical Code and/or any other
applicable national or local codes.
h
NOTE!RELAYCONTROLACTION: the M300 transmitter relays will always de-energize on loss of
power, equivalent to normal state, regardless of relay state setting for powered operation. Config-
ure any control system using these relays with fail-safe logic accordingly.
h
NOTE!PROCESSUPSETS: Because process and safety conditions may depend on consistent
operation of this transmitter, provide appropriate means to maintain operation during sensor
cleaning, replacement or sensor or instrument calibration.
h
NOTE:This is a 4-wire-product with an active 4–20 mA analog output.
Please do not supply to Pin1–Pin6 of TB2.
2.2 Correctdisposaloftheunit
When the transmitter is finally removed from service, observe all local environmental regulations
for proper disposal.
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