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L O W P R E S S U R E M O N I T O R E C H O L I N E
P R E C I S I O N
S E N S O R S
L O W P R E S S U R E
M O N I T O R
ECHOLINE
P r e v e n t s U n w a n t e d S h u t d o w n
T i m e a n d S p a c e S a v i n g
U L R e c o g n i z e d LED display of process and alarm state
Alarm status indicator
Independently
adjusted
front panel zero
adjustment
Independently-
set low and
high set points
E C H O L I N E
2
U N I T E D
E L E C T R I C
C O N T R O L S
Applications
STATIC PRESSURE APPLICATION
ECHOLINE FULL SCALE RANGES
Gas Cylinder Cabinets
1 to 5 WC
Gas Isolation Box (GIB)
1 to 5 WC
Mini Environments
0.2 WC
Wet Bench & Wet Station
0.5 to 1 WC
Chemical Dispensing
0.5 to 1 WC
Diffusion Furnace Scavenger
0.5 to 1 WC
Cleaning Hoods
0.5 to 1 WC
Glove Boxes
1 to 5 WC
Pump & Equipment Exhaust
1 to 5 WC
Supplemental Exhaust
0.5 to 1 WC
overview
features
Conformance to S2-0200 and
CE, complies with the
requirements of UL 991
Latching relay output with
adjustable time delay
Maintenance Mode to
prevent false trips during
ventilation system balancing
LED status indication
Self-diagnostics
Optional 4-20 mA output
Terminal block wiring
12 to 24 VDC power
Adjustable time delay to
eliminate false trips and
unwanted system shut down
Front cover cleanroom image courtesy of
Pentagon Technologies.
ECHOLINE was designed in cooperation with a leading semiconductor
manufacturer to prevent costly system shutdowns and reduce
maintenance costs associated with low pressure monitoring of gas
cabinet exhaust systems. ECHOLINEs Maintenance Mode feature
prevents false alarms during system maintenance and balancing. A
customer dened time delay prevents false trips which can cause system
shutdowns. ECHO (Electronic Circuit Health Output) diagnostics alert
the user to loss of external power or internal
electronics failure. Four ECHOLINE units t
into the space of one old-fashioned
gauge/switch.
ECHOLINE
Four LDP switches will t
in the same space as one
older gauge/switch E C H O L I N E
U N I T E D
E L E C T R I C
C O N T R O L S
3
SEMI S2-0200 SAFETY CONSIDERATIONS
ECHOLINE
was created using widely accepted best practices in an ISO 9001/AS 9000 quality environment. Components used in
the design and production of ECHOLINE have been selected for their time proven performance, availability and reliability. ECHOLINE
contains no moving parts that can wear out, or microprocessors that are susceptible to hidden software problems.
Operation
High and low limit alarms are independently set from the front panel. In normal operation, the LED display will indicate the sensed
pressure and the High Limit/Low Limit LED status indicators will be green. When a preset limit is exceeded, the LED signals an alarm
condition by turning red. After a customer selected time delay, the electromechanical relay contacts will be latched open and the LED
display will ash the process pressure once every second. Manually depressing the reset button will cause the relay contacts to close if
and when the process pressure is within set limits.
Maintenance Mode
The "Maintenance Mode" option is a unique and convenient safety feature which allows the user to widen the alarm set points during
system maintenance. By closing terminal circuits 3 and 4, using a key switch or password protected computer, the user can expand the
limits to 5% and 90% of the range to continue monitoring and prevent false trips. Opening terminal circuits 3 and 4 immediately
returns the set points to the previous settings.
Time Delay
ECHOLINE includes an adjustable "stand alone" time delay to prevent intermittent tripping due to brief transient upsets. When the
unit senses a pressure outside the limits, the status LED will immediately turn red, but the relay will not open for a pre-selected time
delay. The time delay will reset to zero if the process pressure returns to within the limits during the transient conditions. This feature
provides a degree of "fault tolerance" for exhaust ow interlock uses. The time delay is eld settable through a jumper located on the
rear of the enclosure for 1, 10, 20 or 30 seconds.
ECHO Diagnostics
The ECHO function is an internal electronic check of certain circuit parameters. In the event of an internal failure, the ECHO output
relay immediately opens to communicate the fault condition and the unit display goes blank. The electromechanical output relay has
isolated contacts that monitor the circuit in real time.
When Used To Provide Safety Interlock, Monitor Ventilation
Or Optimize Exhaust, ECHOLINE Features:
Discrete all analog electronic components - no microprocessor
Self-monitoring "ECHO" diagnostics
Complies with the requirements of UL 991
Fault tolerant design
Maintenance mode
User selected time delay
Convenient interfacing with facility alarm system
When Used To Monitor Non- Critical Ventilation, ECHOLINE
Features:
Maintenance mode to prevent false trips during ventilation
system balancing
Optional non-latching relay
Bright LED display of process pressure 4
U N I T E D
E L E C T R I C
C O N T R O L S
specications
INDICATING PRESSURE RANGES
0.2 to 10 WC (see model chart)
DISPLAY
3 digit, 0.30 high red LED
ALARM SET POINT RANGE
Independently set high and low limits, 5 to 90% of
indicating range
RESET
Alarm condition will remain until front panel reset button
is pressed, and pressure is within limits
CALIBRATION
Field adjustable zero via front panel screw adjustment
ACCURACY
1% of range @ 20° C
SWITCH AND ECHO OUTPUTS
Electro-mechanical relay, SPDT, Form A Dry Contacts
RELAY RATING
1.0A @ 30 VDC, resistive
STATUS LEDS
Green in normal state, red in alarm state
TIME DELAY
1, 10, 20, 30 seconds. Factory set at 10 seconds. Changeable
via rear panel jumper.
ANALOG OUTPUT (OPTIONAL)
4-20 mA, non-isolated, current sinking. Maintenance Mode
feature disabled.
OVERPRESSURE
± 14.5 psi (1 WC and above), ± 80 WC (under 1 WC)
PRESSURE CONNECTION
Push-to-connect tting(s) for 0.25 O.D. tubing or dual
barbed tting for 0.170" I.D. hose
MEDIA
Dry air, or inert non-conductive gas
OPERATING AMBIENT TEMPERATURE
0 to 40°C
ENCLOSURE
1/16
th
DIN 43700, panel mounted polycarbonate, plastic
WIRING
Plugable terminal block, 18-26 AWG
WEIGHT
7 oz (200 g) maximum
POWER
12-24 VDC, 1.4 Watts
E C H O L I N E
ECHOLINE approvals
Conformance to S2-0200 SEMI standards
EN61326-1:1997 Electromagnetic compatibility
UL Recognized Component, Complies with the requirements of UL 991
Model
Range / Units*
Minimum Set Pressure
Proof Pressure
Burst Pressure
LDP0.2
WC
0.2 x 0.001" WC
.002 WC
±
80 WC
7 psig
LDP0.5
WC
0-0.5 x 0.001" WC
0.03 WC
±
80 WC
7 psig
LDP1
WC
0-1" x 0.01 WC
0.05 WC
±
14.5 psig
20 psig
LDP2
WC
0-2" x 0.01 WC
0.10 WC
±
14.5 psig
20 psig
LDP5
WC
0-5" x 0.01 WC
0.3 WC
±
14.5 psig
20 psig
LDP10
WC
0-10 x 0.1 WC
0.5 WC
±
14.5 psig
20 psig
LDP20
WC
0-20 x 0.1 WC
1.0 WC
±
14.5 psig
20 psig
LDP50
P
0-50 Pascal x 0.1 Pascal
3 Pa
±
80 WC
7 psig
LDP100
P
0-100 Pascal x 1 Pascal
5 Pa
±
14.5 psig
20 psig
LDP500
P
0-500 Pascal x 1 Pascal
25 Pa
±
14.5 psig
20 psig
LDP1000
P
0-1000 Pascal x 1 Pascal
50 Pa
±
14.5 psig
20 psig
LDP2000
P
0-1999 Pascal x 1 Pascal
100 Pa
±
14.5 psig
20 psig
* For user selectable scale (WC to Pa) consult factory
E C H O L I N E CODE
DESCRIPTION
TYPE
LDP
Low Differential Pressure
SETTING RANGE
Inches of Water Column
0.2WC
0 - 0.2" WC
0.5WC
0 - 0.5" WC
1WC
0 - 1" WC
2WC
0 - 2" WC
5WC
0 - 5" WC
10WC
0 - 10" WC
20WC
0 - 20" WC
Pascal
50P
0 - 50 Pascal
100P
0 - 100 Pascal
500P
0 - 500 Pascal
1000P
0 - 1000 Pascal
2000P
0 - 1999 Pascal
PRESSURE CONNECTION
N
Single push-to-connect for Negative Pressure
P
Single push-to-connect for Positive Pressure
D
Dual barbed tube for Differential Pressure
STANDARD FEATURES (only one can be selected)
M
Maintenance Mode
A
4 - 20 mA Analog Output
ACCESSORY
C
Clear watertight cover (when ordering separately, specify p/n 9728)
P
Retrot mounting plate (when ordering separately, specify p/n 9729)
OPTIONS
M01
Non-latching arm
M02
6mm Metric push-to-connect tting
M05
D Sub connector (9 pin)
The specied example denotes a 0 to 1" WC ECHOLINE with a single negative pressure port, maintenance mode option,
watertight cover and D Sub connector.
E C H O L I N E
ECHOLINE
6
U N I T E D
E L E C T R I C
C O N T R O L S
how to order
LDP
1WC N
M C
M05
Type
Setting
Pressure
Standard
Accessory
Options
Range
Connection
Feature
LDP
1WC
N
M
C
M05
Create a part number by using the system below. The part number will follow this form: U N I T E D
E L E C T R I C
C O N T R O L S
7
E C H O L I N E
dimensional drawings 50 Seemans Lane
Milford, CT 06460 USA
Telephone: 203 877 2795 Fax: 203 877 8752
Email: sales@precisionsensors.com
www.precisionsensors.com
RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration
of the following factors when specifying and installing UE pressure and
temperature units. Before installing a unit, the Installation and
Maintenance instructions provided with unit must be read and
understood.
To avoid damaging unit, proof pressure and maximum temperature
limits stated in literature and on nameplates must never be
exceeded, even by surges in the system. Operation of the unit up to
maximum temperature is acceptable on a limited basis (i.e., start-up,
testing) but continuous operation must be restricted to the
designated adjustable range. Excessive cycling at maximum
temperature limits coul