DL2
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3 GENERAL PRODUCT OVERVIEW
3.1 Purpose
DL2 is a multi-channel microprocessor-based measuring device with electronically
recorded measurement results. The device is intended to measure process signals in
industrial applications and may be used to measure temperature and other physical values
processed into a standard current loop signal 0/4-20mA, e.g. humidity, pressure, flow,
level and chemical composition, etc. The device is perfectly suited for slow rate variable
runs with changes at a few seconds intervals. Process values recording and flexible I/O
configuration, makes the DL2 data logger suitable for monitoring parameters in warehouse
settings or in process lines, where multipoint measurements are required, especially in: the
glass making industry, food processing, refineries, as well as chemical and pharmaceutical
industries. The device has math channels that enable selected mathematical operations
on the measured values, according to the formulas entered by the user. The user
configurable display and browse functions makes the device suitable for use as a paper-
less electronic logger. The device may be connected to a PC or plant control system via
Ethernet or RS-485 communication ports.
Each device is provided with a basic module and can be extended with additional I/O
modules. Details are provided in section
The device is supplied with 24 VDC source. Detailed information concerning the power
supply is given in consecutive parts of the document, in section
3.2 Basic functions
Measurement of the process values
Depending on the needs, the device may be provided with 3 to 12 measurement
inputs/outputs. The product enables setting up to 30 freely programmable channels. For
each of them the current, the maximum and the minimum values of the measurements are
displayed.
Flow measurement
Each measurement input (incl. binary inputs) and each calculated value have two
independent totalizers assigned. Totalizers can measure slow variable flows, etc.
Totalizers for pulse inputs can provide precise pulses count.
Alarms and control
Two alarm thresholds may be set for every channel. Binary outputs can be assigned to
alarm thresholds. Two modes are available for alarms: latched and non-latched. 4 alarm
relays are available as a standard. Next 6 relays may be installed as an I/O module.
Analog output
One 4-20 mA output is available as a standard. Next 3 outputs may be installed as an
I/O module.
Math channels
Within the math channels, selected mathematical operations are available: addition,
subtraction, division, multiplication, raising to the power of 2 and 3, and square root. The
formula entered in the math channel can contain up to 200 characters.
Summary of Contents for DL2
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