Adtech RBT 372L Instruction Manual

1.0 INTRODUCTION
These instructions refer to the above models. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, see page 4 or refer to the Data
Bulletin. All ADTE CH instruments are factory calibrated and
supplied with a label detailing the calibration. Adjustments
are normally not necessary. A simple check must be
performed to verify calibration before installation to ensure
that it matches the field requirement.
2.0 GENERAL DESCRIPTION
The ADTECH Model RBT 372L and RBT 374L Low Power
Three-Wire RTD Transmitters provide high accuracy
conversion of resistance bulb sensor input signals to a
standard de process signal such as 0-5
This model consumes very low power, typically 3.5 mA de
and is specially designed for remote battery or solar-panel­
powered applications.
The RBT 372L provides 600 volts ac or 1000 volts de
isolation from the input to output/power supply, whereas the
RBT 374 is non- isolated.
The primary features of the RBT 374L and RBT 372L are:
• Low operating power, 3.5 mA typical.
• Wide range-Covers the entire range of 100 ohm
Platinum or 120 ohm Nickel RTD's- j umper selectable.
• Provide linearization of Platinum and Nickel Rtd's.
• Zero elevation or suppression up to 100% of the major
range with a 16 position switch.
• Field adjustable via plug in jumpers and potentio-
meters.
• High accuracy, repeatability, and ambient effect stability.
• RFI resistant.
• NO INTERACTION of ZERO and SPAN.
• Small size-DIN mounting package provides. Only
1"w x 3.1"h x 3.6"d.
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
DIN rail mount enclosure as standard. NEMA 4 and 7
enclosures are optionally available. Installation area/location
must agree with the supplied instruments including operating
temperature and ambient conditions. For detailed mounting
and installation refer to page 4 inside.
Electrical Connections
The wire used to connect the instrument to the control
system Input / Output should be twisted pair ( s ) and sized
according to normal practice. Shielded cable is not normally
necessary ( if used, the shield must be grounded at terminal
1 of the ADTECH instrument and left floating at the sensor ) .
A six position compression terminal block is provided for the
RBT 372L Three-Wire ISOLATED Resistance Bulb Transmitter
RBT 374L Three-Wire NON-ISOLATED Resistance Bulb Transmitter
Instruction Manual
1/0 and power connections. A housing ground terminal is not
required due to non-metallic housing.
Controls
Instrument controls consist of the following:
Multiturn controls are accessible from the front of the unit.
voe voe.
or 1-5
4.0
These instruments are electronic and require no maintenance
except periodic cleaning and calibration.
If the unit appears to be mis-operating, field wiring and/or
associated circuits should be checked. MOST problems are
traced to these areas.
If the problem appears to be the instrument, it may be
checked as installed or removed for a bench check as
detailed in sections 6.0 and 7.0.
5.0
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary
sheets.
NOTE 1: RBT 372L & RBT 37 4L Connections are identical.
NOTE 2: See 2-Wire and 4-Wire RTD connection on
page 2.
-1-
• Two 16 position rotary switches for COARSE ZERO
and COARSE SPAN control.
• One 4 position jumper for selection of major range.
• One 2-position jumper for input ZERO control.
• Multiturn ZERO and SPAN controls.
• One 4 position Jumper for RTD type.
MAINTENANCE
CONNECTIONS
ADTECH
C _ O. M
190-A-000085