Cleveland Controls 6650 User manual

Instruction Manual DM-6650.02
1
CLEVELAND CONTROLS
MODEL 6650
DIGITAL MANOMETER
INSTRUCTION MANUAL DM-6650.02

Instruction Manual DM-6650.02 2
TABLE OF CONTENTS
I.0 INTRODUCTION 3
1.1 General Description.....................................................................3
1.2 Specications ..............................................................................3
1.3 Unpacking....................................................................................4
1.4 Operator Controls........................................................................5
1.5. Connections................................................................................5
1.6 Initial Checkout............................................................................6
2.0 OPERATION 7
2.1 Continuity Testing ........................................................................7
2.2 Pressure Measurement ...............................................................8
2.3. Analog Output Circuit..................................................................8
2.4 Nickel-cadmium Battery Pack......................................................8
2.5 Field Maintenance .......................................................................9
FIGURES
Figure 1: Model 6650 Digital Manometer.........................................10
Figure 2: Integrated Pressure Sensing System...............................10
Figure 3: Continuity Testing & Calibration of a Sensing Switch.......12

Instruction Manual DM-6650.02
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I.0 INTRODUCTION
1.1 GENERAL DESCRIPTION
The Cleveland Controls Model 6650 Digital Manometer provides
accurate measurement of differential pressure up to 10" wc. Pressure
readings are digitally displayed on the 3-½ digit LCD display, in two
common engineering units (Inches H2O and kPa). High and low
air sample ports located on the front of the instrument accept ¼"
ID exible tubing. Included with the manometer is a 10-foot (10')
length of exible vinyl tubing, to be cut following guidelines in this
manual. The manometer is compatible with air and other dry, clean,
non-corrosive gases that will not attack polyester, vinyl, silicone, or
silicone-based adhesives.
In addition, an electrical continuity test circuit is provided for
convenient testing and calibration of pressure sensing switches. NO,
NC, and COM continuity test connections, plus red and green LED
indicators, are located on the front panel. A 3-prong continuity test
cord, six-feet (6') long is included with the manometer.
An analog output signal (0-1 VDC) is provided to permit remote
pressure recording or monitoring. Analog output terminals are located
on the rear panel.
The manometer is powered by a internal rechargeable battery
pack. It can also be connected to an AC line via the power receptacle
located on the rear panel and the provided AC cord.
The Model 6650 Digital Manometer is factory calibrated and
requires no routine maintenance.
1.2 SPECIFICATIONS
Range: 0–10.00" wc
Units of Measurement: 0.0–10.00" wc; 0.0–2.49 kPa; 0.0–1.999" wc;
0.0–0.497 kPa.
Maximum Pressure Input: 5 psi.
Over Range Indication: Digit blanking.
Accuracy: ±1.5% full scale, ±1 digit, typical at 77 ºF (25 ºC).
Temperature Error: ±0–0.014%/ºF, typical; ±0–0.025%/ºC, typical.
Ambient Temperature Limits: 40–122 ºF (5–50 ºC).

Instruction Manual DM-6650.02 4
Analog Output: 0–1 VDC.
Operator Controls: Power On/Off, Zero Adjustment; Pressure-units
Selector; Display Hold.
Display: 3-½ digit LCD with low battery indication.
Settling Time: 5 seconds.
Pressure Input Connection: ¼" ID exible tubing.
Continuity Connection: ⅛" miniature banana jacks with test cable.
Analog Output Connection: 5-way miniature binding post (⅛").
Power Input Connection: IEC universal connector with cord.
Power Requirements: 120V, 50/60 Hz., 4W.
Battery Pack: Rechargeable nickel-cadmium.
Operating Time: 15 hours maximum from full charge.
Recharging Time: 16 hours maximum.
Media: Dry, clean gases that will not attack polyester, vinyl, silicone,
or silicone-based adhesives.
Case: Black, high-impact plastic with tilt handle.
1.3 UNPACKING
The shipping carton contains the following items:
• Model 6650 Digital Manometer
• AC cord set (P/N 27560)
• Transparent exible vinyl tubing, ¼" ID, ⅜" OD, 10' length
(P/N 25781)
• 3-prong continuity test cord, 6' long (P/N 27636)
• Aspiration probe,12" (P/N 31309)
• Impact probe, 12" (P/N 31310)
• Instruction Manual DM-6650.xx
Conrm that each of these items is in the carton. If any item is
missing or damaged, please call Customer Service at (216) 398-
0330.

Instruction Manual DM-6650.02
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1.4 OPERATOR CONTROLS
All operator controls are located on the front panel.
• The Zero Control is a single-turn potentiometer used to set
the display to “000” when no differential pressure is present at
the inputs.
• The Power Control is a double-action pushbutton switch that
controls the AC line and battery power. Power is “ON” when
the switch is pushed in. Power is “OFF” when the switch is
depressed again and returns to the out position.
• The Hold Control is a double-action pushbutton switch. The
pressure reading freezes at the moment the switch is pushed
to the “in” position. Depressing the switch a second time
releases the hold.
• The Unit Selection Controls are four pushbutton switches
used to select the unit of measurement displayed. They are
interlocked so that only one can be in the “in” position at a time
ensuring that only one unit of measurement can be selected
for display.
1.5. CONNECTIONS
Connections are located on the front and back panels.
• Pressure Input Connections are made to the HI and LO
pressure ports located on the front panel. The ports are
designed to accommodate ¼" ID exible vinyl tubing (supplied
with the Digital Manometer).
• Electrical Continuity Test Circuit Connections are
the ⅛" miniature banana jacks located on the front panel.
Connections are made with the test cable included with the
Digital Manometer.
• Analog Output Terminals are the ⅛" binding posts located
on the back panel. They accept ⅛" miniature banana plugs, tip
jacks, or wire leads to provide output for a remote recording or
monitoring device (not included).
• AC Power Receptacle is located on the rear panel and
accepts the AC cord included with the Digital Manometer.

Instruction Manual DM-6650.02 6
1.6 INITIAL CHECKOUT
1.6.1 Connect the power cord.
1.6.2 Press the ON-OFF switch to the “ON” position and push
the desired unit of measurement switch.
1.6.3 When the display appears, adjust the Zero Control until it
reads “0.00”.
1.6.4 Apply a known pressure to the HI port and conrm that
a pressure reading appears. An alternative method is to
press a nger tightly over the HI port. The air in the port
will be compressed sufciently to produce a reading.
1.6.5 Plug the continuity test cable into the three test jacks.
Connect each color-coded wire to the matching, labeled
jack.
1.6.6 Touch the Normally Open (NO) wire to the Common (C)
wire, and conrm that the NO LED (red) lights up.
1.6.7 Touch the Normally Closed (NC) wire to the Common (C)
wire, and conrm that the NC LED (green) lights up.

Instruction Manual DM-6650.02
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2.0 OPERATION
2.1 CONTINUITY TESTING
2.1.1 Prove circuit integrity, check and calibrate sensing switches
using the continuity testing capability of the Digital
Manometer. Note: When testing an installed switch,
rst disconnect the power source from the switch
to avoid shock hazard and damage to the continuity
tester.
2.1.2 The continuity circuit consists of two LED’s and a series
resistor in open circuit condition. Continuity between
COMMON (C) and either Normally Open (NO) or Normally
Closed (NC) illuminates the red (NO) or green (NC) LED.
2.1.3 A non-resistive ⅛ amp fuse is located in the power supply
connection to protect the battery and manometer circuits
if the continuity circuit is inadvertently connected to AC
power or any other high potential source.
2.1.4 To determine the pressure at which a sensing switch opens
or closes, connect the continuity test cable to the three
continuity jacks on the front panel of the manometer (see
Section 1.6, above).
2.1.5 Connect the color-coded wires of the test cable to the
sensing switch contacts. Be sure to connect the common
wire (C) to the common contact, the normally open (NO)
wire to the normally open contact, and the normally closed
(NC) wire to the normally closed contact.
2.1.6 Connect the manometer’s pressure inputs in parallel
with the switch. Press the manometer’s ON/OFF switch
to the ON position, and push the 0-10 In. H2O unit of
measurement switch. When the display appears, adjust
the ZERO control until it reads “0.00.”
2.1.7 At pressures below the sensing switch set point, the green
LED (NC) will be on, indicating that this circuit is closed.
The red LED (NO) will remain off.
2.1.8 At the switch’s set point, as indicated on the manometer,
the green NC LED will go out and the red NO LED will
come on.

Instruction Manual DM-6650.02 8
2.2 PRESSURE MEASUREMENT
2.2.1 The measuring element in the Model 6650 Digital
Manometer is a piezoresistive pressure transducer. The
transducer has a full scale input range of 0-10” wc and a
linear output of 1-6 VDC.The Digital Manometer can be
used to measure gauge or differential pressures or
vacuums.
2.2.2 To measure gauge pressure, connect the pressure source
to the HI input. Leave the LOW input open to atmosphere.
2.2.3 To measure differential pressure, connect the higher
pressure source to the HI input and the lower pressure
source to the LOW input. If a negative reading is displayed,
reverse the high and low pressure sources.
2.2.4 To measure gauge vacuum, connect the vacuum source
to the LO input. Leave the HI input open to atmosphere.
2.2.5 To measure differential vacuum, connect the lower
vacuum source to the LOW input and the higher vacuum
source to the HI input.If a positive reading is displayed,
reverse the high and low pressure sources.
2.3. ANALOG OUTPUT CIRCUIT
2.3.1 The analog output circuit is a differential amplier with a
gain of x 1n.
2.3.2 The differential 0-5 volt signal on the main PC assembly
is connected to an adjustable attenuator, which is set to
provide a 0-1 volt signal to the differential amplier.
2.3.3 This provides a buffered 0-1 volt signal for remote
monitoring or recording.
2.4 NICKEL-CADMIUM BATTERY PACK
2.4.1 The internal rechargeable battery pack provides for
cordless operation. When fully charged, it will operate for
15 hours before recharging is required.
2.4.2 To charge the battery, connect the manometer to the AC
line with the manometer turned OFF. Charging time is 16
hours from fully discharged to fully charged. Additional
charging is not harmful.

Instruction Manual DM-6650.02
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2.4.3 For maximum battery life, the battery should be fully
discharged and recharged every 3 months.
2.4.4 When the battery voltage drops below 10V, the “LO
BAT” symbol lights up on in the display.
2.5 FIELD MAINTENANCE
2.5.1 The Model 6650 Digital Manometer is a solid state
device with no moving parts and no scheduled
maintenance requirements other than the battery
charging procedure described in Section 2.4.
2.5.2 The manometer is factory calibrated and does not
require additional eld calibration.
2.5.3 Do not exceed the maximum pressure rating (5 psi).
2.5.4 Use only with compatible media: dry, clean gases that
will not attack polyester, vinyl, silicone, or silicone-
based adhesives.

Instruction Manual DM-6650.02 10
A. Digital Readout: 3-½ digit liquid crystal display.
B. Field calibration to null readout.
C. Continuity tester to verify circuit integrity.
D. Air sample ports accept ¼" ID exible tubing.
E. Operation selector allows various conversion factor readings.
HOLD freezes the readout for value comparison.
F. Analog output terminals for remote recording or monitoring.
G. 110 V AC power line receptacle.
H. Rechargeable nickel cadmium battery pack.
Figure 1: Model 6650 Digital Manometer
Figure 2 (facing page): Digital Manometer/Integrated Pressure-Sensing
System Connect the NO, NC & COM terminals on the air switch to the NO, NC &
COM terminals on the manometer.
2. Tubing: Connect the HI side of the air switch to the HI side of the manometer.
Connect the LOW side of the air switch to the LOW side of the manometer.
3. Tubing from manometer to “T” tting and tubing from air switch to “T” tting must
be the same length. Also, keep these pieces as short as possible.
4. The tubing connecting the probe(s) to the tee(s) can be a different length. The
manometer ships with a 10 ft. piece of tubing to be cut as needed. Illustration is not
to scale!

Instruction Manual DM-6650.02
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A. Duct
B. Fan/blower.
C. Filter/damper.
D. Pressure Impact Probe (+).
E. Pressure Aspiration Probe (-).
F. Air sensing switch.
Note: use probes (D + E) together for differential pressure measurement.
Important! This illustration is not drawn to scale. It is intended to show the electrical
and pressure connections as clearly as possible.Note that the pieces of tubing
between the manometer and the tees must be the same length as the pieces
running from the air switch connectors to the tees. Also, keep them as short as
possible.The tubing connecting the probe(s) to the tee(s)can be a different length.
The manometer ships with a 10’ piece of tubing to be cut as needed.

Instruction Manual DM-6650.02 12
Cleveland Controls
DIVISION OF UNICONTROL INC.
1111 Brookpark Rd
Cleveland OH 44109
Tel: [phone]
Fax: [phone]
Email:[email protected]
Web page: http://www.clevelandcontrols.com
Figure 3: Typical application of Series 6650 Digital Manometer for continuity testing
and calibration of an air pressure sensing switch.