Modus Manual
MPM-1✦ MPM-2
Pressure Indicator/Transmitter
with Alarms
Modus Instruments
a division of General Eastern Instruments
P/N 70-00020 Revision A
20FEB2001
Installation and Operation
Tel: 800-225-3208
Fax: 781-938-1071
P.O. Box 900, 55 Green Street, Clinton, MA 01510 USA
a division of General Eastern Instruments
Warranty
Modus Instruments, a Division of General Eastern Instruments
(the Seller), warrants equipment of its manufacture against
defective materials or workmanship for a period of 18 months
from date of shipment from Modus Instruments. Liability of the
Seller under this warranty is limited, at Seller’s option, to repair
or replacement of defective parts at no charge.
This warranty is subject to the following conditions:
• prompt notification to Seller upon discovery of defects or
missing items
• obtaining a Return Authorization Number from Seller to
return defective items to plant as directed
• return of equipment with freight charges prepaid, or as
otherwise agreed
Defects caused by negligence, misuse, improper installation,
accident or unauthorized repair or alteration by buyer or user,
or any modification, such as changing range resistors, may void
this warranty.
This warranty does not include mechanical parts failing from
normal usage nor does it cover limited-life electrical components which deteriorate with age.
This warranty is in lieu of all other warranties, expressed or
implied, including the implied warranty of fitness for a particular purpose to the original Purchaser or to any other person.
Seller shall not be liable for consequential damages of any kind.
Returning equipment without a Return Authorization number
and Purchase Order significantly delays turnaround time and
incurs additional costs. To expedite repairs and reduce costs,
please follow the above instructions.
Contents
Note: Modus Instruments guarantees NIST traceability and
operation within stated specifications. However, claims regarding accuracy or traceability will be covered under warranty
only when verified at Modus Instruments, or by a fully independent testing laboratory. Examples of independent labs are:
National Institute of Standards and Technology in the U.S., and
the National Physical Laboratory (NPL) in the U.K.
Installation - - - - - - - - - Mounting - - - - - - - - Connecting pressure lines - Electrical connections - - - -
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Operation - - - - - Power-up test - - Pressure display - Zero function - - -
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11
11
11
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The aforementioned provisions do not extend the original warranty of any article which has been either repaired or replaced
by the Seller.
Optional I/O programming (MPM-2 only)
General programming information - - About the Alarm Set Points - - - - - - Programming the Alarm Set Points - - About the Relay Deadband - - - - - - Programming the Relay Deadband - - About the Analog Outputs - - - - - - Programming the Analog Outputs - - - Returning to normal operation - - - - -
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12
12
13
14
15
18
18
19
19
Damaged Shipments
Factory default settings - - - - - - - - - - - - - - - 21
In case of shipping damage, it is the Buyer’s responsibility to file
a claim. The Buyer should inspect the shipping container upon
receipt and note any evidence of damage on the freight waybill.
If concealed damage is found after opening the container, the
customer should file a claim with the carrier at once. The customer must retain the shipping container and all materials during the lifetime of the warranty.
LED / DISPLAY conditions - - - - - - - - - - - - - - 22
Repaired Equipment
All repairs are warranted for 90 days. Only the repairs and components replaced as part of these repairs are covered by this
warranty. Other repairs or defective parts are covered by the
original warranty, if applicable.
26
Appendix B — Repairs and returns
Introduction - - - - - - - - - - - - - - - - - - - - - - 1
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3
3
5
6
Appendix A — Specifications - - - - - - - - - - - - - 23
Appendix B — Repairs and returns - - - - - - - - - - 25
Appendix B — Repairs and returns
Instrument Return Procedure
All Modus Instruments equipment is fully tested and calibrated
prior to shipment. Should a problem with the operation of the
equipment arise, follow the procedure below:
1. Contact the factory to discuss the problem. In countries
other than the U.S., the local agent can also be contacted.
Sometimes a problem can be resolved by a change in operating procedure or an adjustment to the equipment.
2. If the equipment must be returned to the factory, before
doing so, obtain a return authorization number from
Modus Instruments, and reference the number on the
return shipping papers. A written description of the problem should also be included with the instrument.
3. If equipment is covered by Modus Instruments’ Warranty
Policy, the unit will be repaired at no charge and returned
to the customer.
4. If equipment is not covered under the terms of the warranty, Modus personnel will contact the customer with a
repair estimate.
5. After receiving a Return Authorization Number, the equipment must be returned freight prepaid.
6. Modus Instruments reserves the right to apply a minimum
service charge in cases where an instrument is returned for
repairs or recalibration, but does not require service.
Appendix B — Repairs and returns
25
Display: 3-½ digit LCD display
User Adjustments:
Three push-buttons: Zero, Mode Selection, Up-Arrow
Power Requirements
Voltage:
5–36 VDC for models with no analog output and no relays
11–32 VDC for models with analog output option and/or
relay option
Power Consumption:
30 mA for models without options
70 mA for models with relays or Analog Output
110 mA for models with relays and Analog Output
The Modus MPM family of instruments provides low-cost monitoring of differential pressure for air and other clean inert
gases. These instruments have large, digital displays and are
packaged in compact ⅛ DIN cases.
The model MPM-1 is the basic instrument, with a numeric display. The MPM-2 adds LED alarm indicators with adjustable set
points, optional relay outputs, and optional analog outputs.
Optional outputs can be added at a later time by returning the
unit to the factory. Either model may be ordered with English
display units (inches H2O) or metric units (kPa).
Available ranges and units:
English units (In. H20)
Connections
Electrical:
Power: screw terminal, 14–26 AWG
Optional outputs: screw terminal, 16–28 AWG
Analog output (0/4–20 mA and 0–5 VDC) isolated
Dual Relay Contacts, 2 Amp, SPDT
(7 amp optional)
Pressure Lines: ⅛ NPT (Female)
24
Introduction
Metric units (kPa)
Nominal
range
Maximum
displayed
value
Nominal
range
Maximum
displayed
value
± 2" H2O
± 1.999
± 2 kPa
± 1.999
± 5" H2O
± 5.00
± 5 kPa
± 5.00
± 10" H2O
± 10.00
± 20" H2O
± 19.99
The remainder of this manual uses the 2" H 2O model for examples.
Appendix A — Specifications
Introduction
1
Appendix A — Specifications
3.75
Front
View
Physical
Configuration: Panel Mount (up to ¼" thick)
⅛ DIN, 1.9" deep (at base of pressure fittings)
Dimensions:
Panel Cutout Dimensions: 3.62" wide x 1.77" high
Enclosure:
NEMA 4 (Front Panel Only) with gasket
accessory
Housing Material:
ABS Plastic
Panel Retention Clip Material:
Polycarbonate
Operating Temperature Range:
0 to 55°C
Storage Temperature Range:
–20 to 70°C
Relative Humidity:
10% to 90%
1.90
3.60
Measurement capability
Top
View
1.40
.16
Optional Measurement Ranges:
.07
Side
View
Proof Pressure:
Relative Accuracy:
Span Tempco:
Zero Tempco:
Pressure Line Polarity:
Warm-up Time:
1.75
± 2" H2O
± 5" H2O
± 10" H2O
± 20" H2O
± 2 kPa
± 5 kPa
3 × Range
± 0.5% of range
± 0.02% FS/°C
± 0.05% FS/°C
Bi-directional
3 minutes to rated accuracy
Figure 1 – Front, Top and Side Views
2
Introduction
Appendix A — Specifications
23
LED / DISPLAY conditions
Normal operation states:
LEDs not flashing
Installation
Mounting
OFF
OFF
ON
OFF
OFF
ON
ON
No Alarms
HI Alarm
LO Alarm
The MPM family of products is designed to mount into a standard ⅛ DIN panel cutout. Panel thickness can be up to ¼"
thick. An accurate panel cutout is important because the ⅛
DIN standard specifies a narrow flange. The flange secures the
unit to the panel and also provides the bearing surface for the
optional NEMA 4 gasket.
3.62 +.03
–.00
Both Alarms
(92 +0.8
–0.0 )
ON
Programming states:
LEDs flashing (except 4th
state—all off)
FLASH
OFF
OFF
FLASH
FLASH
FLASH
OFF
Enter HI Set Point
Enter LO Set Point
(45 +0.6
–0.0 )
DIN standard
Panel Cutout
Inches (mm)
Enter Deadband
Figure 2 – Panel Cutout
Enter Analog Offset
OFF
Be sure to leave enough space behind the unit for the pressure
tubing to bend without kinking.
After the panel has been cut, slide the unit through the panel
cutout. While holding the unit firmly against the panel, slide
the panel retention clip over the rear of the panel meter with
the tension arms facing the rear of the panel. Push the reten-
If all numeric digits flash, the
input pressure exceeds the
measurement range of the
unit.
22
1.77 +.02
–.00
LED / DISPLAY conditions
Installation
3
tion clip firmly against the rear of the panel. The clip will automatically lock into position.
1/8 NPT
Pressure
Ports
2 PLCS
1.66
tension arms
panel
Factory default settings
The factory default settings for MPM-2 programming parameters are listed below:
High Set Point: + Full Scale (1.999" for 2" H20 models)
Low Set Point: – Full Scale (–1.999 for 2" H2O models)
Deadband: .100
retention clip
Analog output offset setting: ½ Offset
To restore the factory defaults, remove the unit’s power, press
and hold MODE, reapply power, and release MODE.
Leave sufficient room
for tubing bend radius
Figure 3 – Side View with retention clip
To remove the panel meter, unlock the retention clip by spreading the clip ears on both the left and right sides. While the ears
are spread, slide the retention clip away from the panel. The
same retention clip may be used again to re-install the panel
meter.
Modus Div. of General Eastern Instruments
MPM-2 with
optional
I/O connector
shown
+
S/N
HI
POWER
RANGE
MODEL
PROOF PRESSURE
LO
1 2 3 4 5 6 7 8 9 10
EXT. I/O
1/8 NPT
Figure 4 – Rear View
4
Installation
Factory default settings
21
Connecting pressure lines
Pressure
for a
2" H20
Unit
+1.999"
(+ Full Scale
input)
ANALOG OFFSET SETTINGS
SETTING SETTING SETTING SETTING SETTING SETTING
0
1
2
3
4
5
5V
20 mA
5V
20 mA
5V
20 mA
20 mA
20 mA
20 mA
The pressure ports accommodate any standard ⅛" NPT male
fittings. Two fittings suitable for most applications are provided
with the unit. The fittings support tubing with ⅛" internal
diameter. If your application requires a different tubing size,
unscrew the supplied fittings and install a fitting to adapt your
tubing size to the unit’s ⅛" NPT female threads.
+0.666"
0.000"
The pressure ports, located at the rear of the unit, are labelled
HI and LO. If the HI port has a positive pressure relative to the
LO port, the front panel display will read positive (+). If the HI
port pressure is lower than the LO port pressure, the display
will read negative (–).
2.5 V
10 mA
0V
0 mA
1.25 V
5 mA
12 mA
4 mA
0V
0 mA
–0.666"
8 mA
4 mA
Plastic fittings usually do not require thread sealing compounds or tapes, provided they are properly tightened. While
not recommended, metal fittings can also be used, with the following precautions:
• Thread sealing compounds or tapes may be required,
depending on the amount of leakage your application
can tolerate.
• Be careful not to strip the plastic threads.
–1.999"
(– Full Scale
input)
0V
0 mA
0V
0 mA
0V
0 mA
4 mA
4 mA
4 mA
Figure 16 – Analog output offset settings
20
Optional I/O programming (MPM-2 only)
Do not allow material of any kind to fall into either pressure
port—contamination could lead to inaccurate readings or damage to the internal sensor.
For accurate measurements made with respect to ambient
pressure, run a return line to the measurement point rather
than simply leaving the second port open to the atmosphere.
Installation
5
Electrical connections
Note that Setting “0” (½ offset) is the factory default setting.
Power connections
Refer to the rear label of the unit for the power supply range
that your particular model supports. All models require D.C.
power, and therefore polarity must be observed. The polarity is
indicated on the rear label as well as on the screw-terminal
power connector provided with the unit.
Figure 16 on page 20 illustrates the available settings.
The power connector’s two screw terminals accommodate wire
sizes between 14 and 26 AWG. Either stranded or solid conductor wire can be used. The power connector can be unplugged
from the rear of the unit to ease the installation of the wires.
The connector is keyed to prevent incorrect insertion. Models
with no optional outputs draw a maximum of 30 mA of current.
See Appendix A for current draw of other models.
Press MODE once after the previous
step to display the analog output offset setting. The digit “1” on the left
indicates the unit is in “Analog Setting” mode. The digit on the right
indicates the selected setting (0–5).
Press the ARROW key to change the
setting.
Note: Even though the Analog Output may be programmed to clip at its
minimum value when the input pressure goes negative, the MPM will still
display readings over the full input range that is valid for the unit.
Programming the Analog Outputs
Figure 15 – Analog
output offset setting
The digit being entered rolls over from 5 to 0, so that if you pass the
desired setting, continue pressing until the desired number is displayed.
5–36 VDC
+
–
V
Returning to normal operation
Press MODE a final time to end programming and return to the
normal pressure display.
– +
Figure 5 – Wiring with
no options
6
Installation
Optional I/O programming (MPM-2 only)
19
Note: The remainder of this Installation Section refers to model
MPM-2, with options installed, only.
Programming the Relay Deadband
To display the deadband, press
MODE once after setting the LO set
point polarity in the previous step.
Both alarm LEDs flash. The three
digits displayed are the deadband
width, in the same units used for
data display. The factory default
deadband value is .100.
Optional relay output connections
The optional relay board has two relays, one controlled by the
HI alarm LED and the other by the LO alarm LED.
Figure 14 – Deadband
Press the ARROW and MODE keys as described earlier to step
the deadband to a value from .000 to .999.
About the Analog Outputs
The optional analog outputs can be programmed to any of six
offset settings. Settings 0, 1 and 2 provide the full range of analog output values (0–5VDC and 0–20mA), with a choice of offsets. Settings 3, 4 and 5 provide an output current range of
4–20mA, with the same offset choices. Available analog output
offset settings and output ranges are shown below.
Setting
number
Setting
name
Input range
for linear
output
0
1/2 offset
–F.S. to +F.S.
1
no offset
0 to +F.S.
2
1/4 offset
< 0 to +F.S.
0–5V
3
1/2 offset
–F.S. to +F.S.
4
no offset
0 to +F.S.
5
1/4 offset
< 0 to +F.S.
N/A
18
Voltage
output
range
Current
output
range
Analog output
at zero
pressure
0–5V
0–20mA
2.5V / 10mA
0–5V
0–20mA
0V / 0mA
0–20mA
1.25V / 5mA
N/A
4–20mA
12mA
N/A
4–20mA
4mA
4–20mA
8mA
Optional I/O programming (MPM-2 only)
Relay outputs are wired to the 10-pin connector supplied with
the unit (see Figure 7). The 10-pin connector can be removed
from the unit to facilitate connecting the wires.
Each relay has a common connection with normally-open and
normally-closed contacts. Relay contacts are rated at 2 amps at
30 VDC (derated to 1.0 amp at 120 VAC).
11-32 VDC
–
V
AC/DC power
+
LOAD
– +
6 5 4 3 2 1
pin 1: HI Alarm Common
pin 2: HI Alarm N.C.*
pin 3: HI Alarm N.O.
pin 4: LO Alarm Common
pin 5: LO Alarm N.C.*
pin 6: LO Alarm N.O.
* N.C contacts closed
when in “no alarm”condition.
LO
Alarm
HI
Alarm
Shown in "No Alarm" condition
Installation
Figure 6 – Wiring
with Relays
7
High-current contacts are
available as an option. They
are rated at 7 amps at 30 VDC
or 120/250VAC, but they
should not be used for
low-current control use (currents below 100 mA).
Relays are designed to be
failsafe: they will switch to
the alarmed position if the
relay coil current fails. This
means a power loss will
force both relays into the
alarm state.
1
2
3
4
5
6
7
8
9
10
HI Alarm Common
HI Alarm N.C.
HI Alarm N.O.
LO Alarm Common
LO Alarm N.C.
LO Alarm N.O.
Voltage Out (0–5 VDC)
Analog Ground (isolated)
Current Out
+ Analog Power (isolated)
Figure 7 – External I/O
output wiring
1.999
1.898
1.000
1.999
HI S.P.
1.101
LO S.P.
WARNING: Latchup
will occur. Power
must be removed,
or deadband or
setpoint must be
reprogrammed to
release relay
1.000
LO S.P.
relay release points
HI S.P.
.899
WARNING: Latchup
may occur–a negative
pressure must be
applied to release relay
WARNING: Latchup
may occur–a positive
pressure must be
applied to release relay
.050
0.000
–.051
HI S.P.
–1.000
HI S.P.
–1.000
–1.101
WARNING: Latchup
will occur. Power
must be removed,
or deadband or
setpoint must be
reprogrammed to
release relay
–1.898
–1.999
HI S.P.
–1.999
.051
0.000
–.050
LO S.P.
See page 14 for programming the relay set points.
A deadband provides hysteresis to keep the relay contacts from
chattering when the pressure value fluctuates about the setpoint. See page 15 for setting the width of the deadband.
.899
Optional analog output connections
Analog output pins provide voltage (0–5VDC) and current
(4–20mA or 0–20mA) outputs.
Voltage and current outputs are supplied on separate connector
pins, and are available simultaneously.
The analog output is isolated from the unit’s input power, and a
source of DC power must be connected to pin 10 (+) and pin 8
(–) of the I/O connector. This voltage can range from +11 to
+32 volts DC. If power supply isolation is not a concern, then
Five examples of HI setpoints
with deadband of .100
showing relay release points
and possible latchup conditions
8
Optional I/O programming (MPM-2 only)
Installation
LO S.P.
relay release points
LO S.P.
Five examples of LO setpoints
with deadband of .100
showing relay release points
and possible latchup conditions
Figure 13 – Examples of Deadband settings
17
through the deadband threshold are shown. It is necessary to
assure that set point and deadband settings will not be subject
to these conditions.
power for the analog output circuitry can be tapped from the
MPM’s main power connection.
Pressure
MPM's
main power
11–32 VDC
HI Setpoint = 0.500
LO Setpoint = –0.500
Deadband = .100
0.500
–
+
V
pin 7 Voltage out
pin 8 Analog ground
pin 10 + Analog power
LOAD (> 3KΩ)
HI
} Deadband
0.399
V
Analog output
isolated power
11–32V
+
–
– +
0
10
8 7
Pin 7: Vout (0-5V)
–0.399
LO
} Deadband
–0.500
OFF
ON
OFF
OFF
ON
Time
HI Relay
OFF LO Relay
Figure 12 – The Deadbands
Isolated Analog Voltage Output
For non-isolated analog output,
analog power and ground (pins 10 & 8)
may be tapped from main power.
Figure 8 – Wiring with
voltage output
Analog outputs are wired to pin 7 (voltage) and/or pin 9 (current) of the 10-pin connector supplied with the unit (see Figure
7). The 10-pin connector can be removed from the unit to facilitate connecting the wires.
The analog output is proportional to pressure. Any one of six
offset settings may be selected. See page 18 for programing
these outputs. The factory default is Analog Offset Setting 0 (at
16
Optional I/O programming (MPM-2 only)
Installation
9
zero pressure, analog voltage out = 2.50V and analog current
out = 10.0 mA).
The voltage output should be connected to a load of 3,000
ohms or greater.
MPM's
main power
11–32 VDC
–
V
– +
+
Analog output
isolated power
11-32V
+
–
V
10
9
pin 8 Analog ground
pin 9 Current out
pin 10 +Analog power
After the HI set point has been programmed, press MODE to
enter the LO set point. The LO alarm LED flashes, and you can
repeat the above process to program the LO set point.
Note: To set the LO set point without changing the HI set point, you must
step through all the HI set point digits by pressing MODE until you get to
the LO set point digits.
About the Relay Deadband
8
The optional relay board contains two relays—one controlled by
the HI set point and one by the LO set point. Programming the
set points for the LEDs and relays is described in the previous
section.
0/4 – 20mA
Isolated Analog Current Output
For non-isolated analog output,
analog power and ground (pins 10 & 8)
may be tapped from main power.
Warning: The left-most digit is a “half digit” (excluding the 5" and 5 kPa
models). This means it can only display values of a blank (“0”) or “1.” You
will always see a flashing “1” when you move to this digit, to identify this
as the active digit. Press the arrow key to stop the flashing and display
either a blank (“0”) or “1,” and then press it again if necessary to select the
desired value.
Figure 9 – Wiring with
3-wire current output
The deadband selection is provided to keep the relays from
chattering when the pressure varies near the set point. (See Figure 12). For 2” models, the deadband can be programmed to
values from .000" to .999" H20 with a factory default of .100"
H20.
Warning: It is possible to program a deadband of zero width. If relays are
connected to the MPM-2, the deadband should be chosen to keep the
relays from chattering when the pressure fluctuates near the set points.
Figure 13 illustrates specific examples of the switching points of
relays with a deadband in place. In particular, the possibilities
of system latchup when the pressure cannot be made to pass
10
Installation
Optional I/O programming (MPM-2 only)
15
The factory default setting for the HI set point is the positive
full-scale value (+1.999 for 2" H20 models). The factory default
setting for the LO set point is the negative full-scale value
(–1.999 for 2" H20 models). The user can program the HI and LO
set points independently to any value within the available
range.
If either or both set points will not be used, it is suggested that they be kept
at the factory settings at the outer boundaries of the usable range.
When the measured pressure equals or exceeds the HI set point
value, the HI LED alarm indicator illuminates. The LED remains
illuminated until the pressure falls below the programmed HI
set point value, less any deadband that has been programmed.
When the measured pressure equals or is more negative than
the LO set point value, the LO LED alarm indicator illuminates.
The LED remains illuminated until the measured pressure rises
above the programmed LO set point value, plus any deadband
that has been programmed.
Note that the LO set point can be programmed higher than the
HI setpoint, for applications where it is desired to illuminate
both LEDs when the pressure is within a desired range.
Programming the Alarm Set Points
Operation
Power-up test
When power is applied, the unit
begins a 20-second diagnostic test
which activates all LCD segments
(and the LEDs on the MPM-2),
cycling each character through all
Figure 10 – LCD Readout
digits. The user should visually verify that all indicators function properly.
Pressure display
After the power-up test is complete, the panel meter displays
pressure readings. If the input pressure is greater than the unit’s
maximum (see the table on page 1), the display indicates overranging by flashing the full-scale value (e.g., 1.999" for 2" models).
Zero function
The unit should be zeroed after installation in its final position,
and whenever its orientation is changed. The unit may be used
in any position, but the internal sensor is position sensitive.
After the first press of MODE, the HI LED flashes, indicating the
HI set point is being entered. Press the ARROW key repeatedly
to display the desired digit. Next, press MODE to move towards
the most significant digit, and repeatedly press the ARROW key
to advance the digit’s value. Continue for the remaining digits.
The sign of the set point (+ or –) is selected last.
To zero the panel meter, disconnect the tubing from
ZERO
both fittings so that the differential pressure is known
to be zero. With both pressure ports exposed to the
same environment, press and hold the ZERO button for at least
three seconds, until the display reads .000. The unit does not
need to be re-zeroed each time power is reapplied, because all
calibration and user settings are saved in non-volatile memory.
14
Operation
Optional I/O programming (MPM-2 only)
11
Optional I/O programming (MPM-2 only)
General programming information
To enter the MPM-2’s programming mode, press the MODE
button. Repeatedly pressing
MODE steps through all programming modes in sequence.
It is necessary to step through
all entries to leave programming mode and return to normal operation.
MODE
1. Enter the HI Set Point for alarm LED and relay.
Press to enter programming mode
and move through
the steps.
Press to advance
the digit to its next
value.
All the values programmed into
the unit are stored in non-volatile memory. They do not need
to be reentered whenever
power is reapplied.
In general, values are entered as follows while in programming
mode: A single digit of the value flashes, indicating that that
digit can be changed. Press the ARROW button repeatedly to
advance the flashing digit. If you pass the desired value, continue pressing the ARROW button. The digit will roll over to 0
after reaching the number 9.
After each digit has been set, press MODE to move to the next
digit.
When entering the Analog Output Offset Setting (0-5), the entry is made
as a single entity, not digit-by-digit, and the entry does not flash.
12
The unit passes through all programming modes regardless of
whether each option is installed.
Optional I/O programming (MPM-2 only)
2. Enter the LO Set Point for alarm LED and relay.
3. Enter the Relay Deadband.
4. Choose the Analog Output Offset Setting.
About the Alarm Set Points
The MPM-2 is equipped with two front-panel LED alarm indicators with a user-programmable set point for each. These set
points control the optional alarms relays as well as the LEDs.
+F.S.
SET
POINTS
ALARM
LEDS
SET
POINTS
ALARM
LEDS
"HI"
ON
"HI"
ON
HI
LO
0
HI
LO
"LO"
ON
–F.S.
Conventional Setting —
HI above LO
"LO"
ON
Alternate Setting —
LO above HI
Figure 11 – Setpoints
Optional I/O programming (MPM-2 only)
13
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