Model mt 3810 – Brooks Instrument MT3810 User Manual
Page 37
2-11
Installation and Operation Manual
X-VA-MT3810-eng
Part Number: 541B050AHG
June, 2008
Model MT 3810
Section 2 Installation
To install the inductive alarms (1 or 2 switches):
1. The inductive alarms can be supplied as a stand alone option or
combined with the transmitter. When stand alone, connections to the
alarms are made inside the indicator housing. When supplied in
combination with the transmitter, connections are made inside the
auxiliary terminal box attached to the indicator housing.
Refer to Figures 1-8 and 1-9 for installation with the transmitter
combined with the inductive alarms.
2. Intrinsically safe installations require the use of relay isolators for the
alarms and a barrier for the transmitter, if equipped. Power supply limits
and cable parameters must be as shown in the installation diagram.
3. If the area classification is Division 2, the transmitter barrier and cable
parameters are not applicable. However for proper operation of the
inductive alarms, the relay isolators must be used. The electrical code
will require the use of conduit for wire protection.
4. If the installation is according to Division 1 explosion proof methods, the
optional explosion proof enclosure is required and explosion proof
installation methods must be followed. For proper operation of the
inductive switches, the relay isolators must be used.
5. It is highly recommended that shielded cable be used for hook up. The
shields should be connected to chassis ground at the transmitter/alarm
end and should be taped up and not connected at the receiver end. The
taping and insulation of the shields at the receiving end is especially
important for intrinsically safe installations.
6. For the transmitter output, if supplied, the maximum resistance of the
loop resistor, the associated cable and the barrier is determined by the
power supply voltage and is shown graphically in Figure 1-2.
7. The relay isolator has built in power handling contacts. Refer to the
specifications for these ratings.