Dwyer Instruments PMT2 Serie Installation Und Betriebsanleitung Seite 3

• Always install or service this device with the power off and where
required install a disconnect lockout
• Use 16 to 20 AWG copper wire only for line and load connections. Installation must
be made in accordance with local codes and regulations such as the National Electric
Code
• Degree of protection TYPE 4 (IP66) is maintained when suitable glands/plugs are
used in conjunction with UL Listed models
• De-energize supply circuit before opening device covers
• Replace device covers before energizing the electrical circuits
is needed
• 4-20 mA signal and remote zero must be treated as separate circuits
• Enclosure parts are constructed of aluminum. Enclosure must be protected from
ignition hazard due to impact or friction
• All openings to enclosure must be sealed using suitable glands and/or plug main-
compliant models
• Substitution of parts may impair Intrinsic Safety.
UL Listed Intrinsically Safe for use in Class I Div. 1 Groups C and D; Class II Div. 1
ia IIB T4 Ga; T4@63°C when installed in accordance with Control Drawing 001744-48
on page 6 of this document.
accordance with Control Drawing 001744-81 on page 7 of this document.
with Control Drawing 001744-81 on page 7 of this document.
4
4-20 mA
3
2
REMOTE ZERO
1
Process
Process
Process
Process
POWER
SUPPLY
RECEIVER
REMOTE ZERO SWITCH
(IF USED)
is based upon the following:
1. Minimum DC voltage requirement of the Model PMT2.
2. Total load resistance.
3. Total leadwire resistance.
4. Zener barrier voltage drop (Model PMT2-XX-X-X2 only).
The formula for calculating the DC Power Supply is:
Live maintenance of Zero, Averaging Time, Range and Test
present.
Press and hold the switch for 3 seconds and the PMT2 will digitally re-zero. It is
The PMT2 will average the output for the selected amount of time. This will dampen
There are 6 sensitivity ranges that can be selected based on the material the PMT2
will be sensing (see Table 1). There is also an option to output a 4 mA or 20 mA signal,
these options can assist in the installation of the transmitter or trouble shooting.
time
test