›Universal input›22V excitation›Optional 0.4" display›2 x relay outputs›Optional isolated analog
output (0[4]–20mA or
0–10V, software select)
›Smart, simple, USB
powered setup
›Designed for harsh EMC
environments
›Flexible 32 point
linearization table
General Description
The Sentry Trip Amplier accepts analog inputs from a
range of industrial sensors, including: process, temperature, ow, frequency, and voltage from 200mV to 300V.
It features a wide range power supply that suits both AC
mains and 24V DC applications, and supplies the excitation required for common sensors and transmitters.
The Sentry comes standard with two relays, which can
be set up for a variety of alarm and control functions.
An optional isolated analog output provides both 0(4)–
20mA and 0–10V signals to interface to PLC's and SCADA systems.
The Sentry is a tough and reliable instrument that has been
designed for demanding industrial environments. Advanced
techniques have been used to meet or exceed CE noise immunity requirements. Optional is a
4 digit display for your convenience during commissioning, and to simplify fault-nding in the
event of a system malfunction.
The unit boasts a 1 minute USB setup using the Dene ToolBox conguration soware. All
functions are explained expertly in the dynamic sidebar help - perfect for the novice learning
about industrial applications, or the expert who wants to save commissioning time.
2 x relay outputs (default conguration)
2 x relay outputs, 1 x analog output (0[4]–20mA/0–10V)
SAFETY NOTICES
For your safety and the prevention of damage to the Sentry unit and other equipment connected to it, please read complete instructions prior to installation and
operation of the Sentry, and carefully observe all safety regulations and instructions. Consult this manual carefully in all cases where hazard symbols are marked
on your Sentry unit.
Use of this instrument in a manner not specied by the manufacturer may compromise the protection provided by the instrument. This instrument should not be used
to directly drive valves, motors, or other actuators, unless equipped with appropriate safeguards.
It is the responsibility of the user to identify potential hazards that may arise in
the event of a fault to unit, and implement safeguards for the prevention of harm
to persons or equipment. The safety of any system incorporating this unit is the
responsibility of the assembler of the system.
Symbol denitions
3
CAUTION
Risk of electric shock
Please refer to user manual.
CAUTION
Risk of danger
Please refer to user manual.
1
SPECIFICATIONS
Power
Power supply 24–250V AC / 19.5–250V DC,
47–63Hz, 6VA max
Isolation 2,300Vrms for 1min to all inputs
and outputs
Both direct and alternating current.
Equipment protected throughout by
DOUBLE INSULATION or REINFORCED
INSULATION.
Analog input
Input Universal (see section 7 for full input
specications and wiring)
Slow blink indicates normal operation, faster ashes indicates error.
See 8.2 for troubleshooting
2.2 - Transparent cover
The transparent plastic cover over the front
panel provides protection (mainly from dust
accumulation over time) to the Sentry's display and programming port.
The transparent cover must be opened to
access the PC Setup Port (see 2.1C) for conguration of the Sentry using Dene ToolBox
(see sections 4–5).
To open the cover, slide your ngernail into
the crack between the plastic cover and the
unit case in the bottom right or bottom le
corner, and then ick the cover upwards.
Note that levering from the right or le side,
rather than the centre, is the easiest way to
disengage the cover's clip.
The Sentry should be installed in a location
that do not exceed the maximum operating
temperature, and at a safe distance from
other devices that generate excessive heat.
The installation environment should provide
good air circulation to the unit.
The plastic casing and product label may be
cleaned, if required, using a so, damp cloth
and neutral soap product.
Caution should be exercised when cleaning
the unit to avoid water to dripping inside, as
this will damage the internal circuits.
3.3 - Installation instructions
A - Mount in an Enclosure (Fig 1)
The Sentry is rated IP20, and should be
mounted in an enclosure (not supplied) to
protect it from weather conditions and dust.
Prepare the enclosure as illustrated by
mounting a 35mm DIN rail, and cable glands
or other required components.
B - Mount on DIN Rail (Fig 2)
To clip the unit onto the DIN rail:
(1) Hook the upper part of the unit onto
the rail, and then
(2) Press down towards the rail until the
red hook clicks into place
Leave at least 2cm (.79") clear on either
side of the unit, and at least 5cm (1.97")
clear above and below the unit, to allow
room for airow and wiring.
7
Fig 1
Fig 2
C - Wiring
Refer to sections 6 & 7 in this manual.
D - Removal from DIN Rail (Fig 3)
The unit may be unclipped from the DIN rail
if required by inserting a small screwdriver
into the slot on the red hook (just visible
when the unit is mounted), and levering the
red hook down.
This will release the hook, allowing the unit
to be detached from the DIN rail.
The Sentry has been designed to cope
with large EMC disturbances. This has been
achieved by continual testing and improvement of ltering and layout techniques over
many years.
The Sentry not only meets CE noise requirements, but surpasses them in many tests.
(For full details and test results, please see
Appendix A.)
However in some applications with less
than optimum installations and large power
switching, the EMC performance of the
Sentry can be further improved, by:
A Reducing noise from large power
switching devices, like contactors,
using one or several of the following
methods:
Install the Sentry in an earthed metal
enclosure.
If the Sentry is mounted close to large
power switching devices like contactors, then every switching cycle there
is a possibility of generating a large
amount of near eld radiated noise.
The metal enclosure acting as a faraday cage will shunt this radiation to
ground and away from the Sentry.
Increase the physical distance of the
Sentry from power devices.
Further improvements can be made
with this type of noise by increasing
the physical distance from the power
devices. For example, increasing the
control box distance from 6” to 12”
from the noise source will reduce the
noise seen by the control box by a
factor of 4.
Add RC snubbers to the contactors or
power switches.
This oers an inexpensive and eective solution.
B Using shielded cable on sensitive input
and control signal lines.
Good results can be obtained by grounding the shields to the metal enclosure
close to the entry point. All cables act
as aerials and pick up unwanted R.F.
radiated signals and noise; the earthed
shield acts as a faraday cage around the
cables, shunting the unwanted energy
to ground.
Shields can also help with capacitively
coupled noise, typically found in circumstances when signal cable is laid on
top of noisy switching power cables. Of
course, in this case, you are better o to
keep separate signal and power lines.
C Laying cable on earthed cable trays.
This can also help reduce noise seen by
the Sentry, and is particularly useful if
there are long cable runs, or the unit is
close to radiating sources such as two
way radios.
D Adding snubbers for AC signals or a
yback diode for DC coils.
The relay outputs of the Sentry have
built in MOVs to help reduce EMI when
switching inductive loads, however
adding snubbers (for AC signals) or a
yback diode (for DC coils) can further
reduce EMI at the load.
ToolBox oers a smart, no-fuss setup experience for your Sentry Trip Amplier. It features USB
powered programming (no power supply required!) and has been designed to simplify and
speed up conguration.
You must install ToolBox before connecting the Sentry to your computer. If you have
already connected the Sentry using the Bridge Key, please disconnect it before continuing.
A Download the latest version of ToolBox from
www.deneinstruments.com/toolbox
For ease of access, we recommend saving the install le on your desktop. If you
can't nd the install le, check whether your browser has saved it in your 'Downloads' folder.
B Extract the install le from the zip folder (Fig 1). Right-click on the zip folder and choose
'Extract All', (or extract the le using another extraction utility of your choice).
SOFTWARE INSTALLATION
Fig 1
A Double-click on the extracted .msi install
le. This will launch the ToolBox installer.
Depending on your security settings, a
'Security Warning' dialogue may appear
(Fig 2).