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CCT-55/ CCT-55-I
Signal Integrators
M2304/1201
TABLE OF CONTENTS
PAGE
Open the Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Internal Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Power Supply module MA . . . . . . . . . . . . . . . . . . . . . . 4
Changing the Power Supply . . . . . . . . . . . . . . . . . . . . 4
Signal Output, module MS-55 Overview. . . . . . . . . . . 5
Types of Pulses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Frequency Output Range Selection, Pulses/second . . 6
Frequency Output Range Selection, Pulses/hour . . . . 7
Signal Input, module ME Overview. . . . . . . . . . . . . . . 8
CCT-55-V, Electrical Features (Specifications) . . . . . 9
Signal Input Range Selection . . . . . . . . . . . . . . . 10
Adjustment and Calibration Procedure . . . . . . . 10
CCT-55-I, Electrical Features (Specifications) . . . . . 11
Signal Input Range Selection . . . . . . . . . . . . . . . 12
Adjustment and Calibration Procedure . . . . . . . 12
Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mechanical Specifications. . . . . . . . . . . . . . . . . . . . . 14
2
C
OPEN THE HOUSING
A
d
PROCEDURE
c
1. Insert a screwdriver or similar tool in the
points marked c.
e
c
d
2. Turn the screwdriver until the case walls
begin to separate towards A and B, so the
two side lugs e, are free.
B
e
3. Grab the Signal Conditioner body, at the
points marked d‚ and pull it towards C,
until the two side lugs e are out of their
housing and the internal circuits are visible.
See the sketch below for the disassembly of
the circuit boards.
FIG.1
4. Before reinserting the Signal Conditioner
body into the case, the following must be
checked :
-The front label (blue color) must be in its correct position, with terminals 1 and
7 (power supply) separated from the other terminals.
-The three internal modules must be inserted correctly in their internal case
guides.
MA
Power Supply Module
C
INTERNAL OVERVIEW
a
a
A. "ME" Input module.
MP
Input board
B. "MS-55" Output module.
C. "MA" Power supply module.
D. "MP" Input Board.
FIG.2
A
B
D
PROCEDURE FOR DISASSEMBLY
1. Pull out the "ME" input module towards "a".
2. Pull out the "MS-55" output module towards "a".
3. Pull out the "MP" input board towards "b".
4. To assemble reverse the procedure.
b
ME Input module
MS-55 Output module
3
POWER SUPPLY module MA
The power supply must be connected to Terminals 1 and 7.
The characteristics of the power supply are shown on the side
label.
1
3
4
5
6
WARNING.- If the power supply is dc voltage, be careful with
the polarity indicated for each terminal.
H i
INPUT / ENTRADA
Make sure the signal conditioner is correctly connected to a
power supply of the correct voltage and frequency. Do not use any
other power supply. Permanent damage may result to the signal
conditioner.
OUTPUTS / SALIDAS
mA
Vdc
+
-
Lo
7
+
9
-
PRECAUTIONS.- The installation must incorporate safety
devices to protect the operator and the process when using the
signal conditioner to control a machine or process where injury to
personnel or damage to equipment or process, may occur as a
result of failure of the signal conditioner.
10 11 12
FIG.3
CHANGING THE POWER SUPPLY
Solder pads are used to change the value of the power supply. They
are located on the "MA" Power Supply module, on the solder side, Fig.
4.
ModuleMA
See Table 1 for more details.
TABLE 1
Power
supply
Status of the solder pads
Closed
Opened
220 Vac
110 Vac
3,3 and 1
3,3,2 and 2
2 and 2
1
*48 Vac
*24 Vac
3,3 and 1
3,3,2 and 2
2 and 2
1
3
3
2
2
1
**24 Vdc
1
3,3,2 and 2
Solder view
*
Using the transformer code 63338301 and selecting the
solder pads as indicated.
** Using the power supply option, code 029103 and select-
ing the solder pads as indicated.
FIG.4
4
SIGNAL OUTPUT module MS-55
OVERVIEW
This module contains all the components for the frequency generator, and the trimmer for the
Span coarse frequency, The jumpers and solder pads to select the output range frequency and
solder pad to select the pulse width.
Both models are delivered as a standard version, with the frequency output adjusted from 0 to
4 KHz., unless specified otherwise.
The frequency range can be set in pulses per second (12 different ranges, see table 2) or in
pulses per hour (13 different ranges, see table 3), using the jumpers and solder pads located
on the MS-55 module, see figure 5.
JUMPERS
on components side.
Snap-on type
D
E
C
B
A
FIG.5
Solder pad 1
Solder pad 5
Solder pad 2
SPAN coarse gain (P3)
J4
TYPES OF PULSES
The signal conditioner provides two different types of output
pulses.
1
3
4
5
6
H i
INPUT / ENTRADA
Pulses in Current: 100 mA. (24 Vdc external
powersupply),terminals9-10
OUTPUTS / SALIDAS
PulsesinVoltage: 24 Vdc. @ 20 mA maximum,
terminals 11 - 12
mA
Vdc
Lo
7
+
-
+
-
9
10 11 12
Do not use both outputs simultaneously. Only one selection can
be made.
The side label shows which one is selected.
FIG.6
5
FREQUENCY OUTPUT RANGE SELECTION
PULSES PER SECOND
Table 2 indicates all the standard available ranges for these models when the frequency output
must be in pulses per second.
Set the jumpers/solder pads to the position indicated in Table 2. The jumpers are located on the
"MS-55" output module.
If the frequency output range is modified follow the adjustment and calibration procedure for
each model.
CLOSE JUMPERS/
AND SOLDER PADS
PULSES / SECOND
PULSE WIDTH
Variable
0 to 5000/10000
E, 2 & 5
0 to 2500/5000
0 to 1250/2500
E, 1 & 5
E, A, 1 & 5
0 to
625/1250
E, B, 1 & 5
50 % of the full cycle
0 to 312.5/625
0 to 156.3/312.5
0 to 78.1/156.3
E, B, A& 5
E, C, 1 & 5
E, C, A, 1 & 5
E, C, B, 1 & 5
E, C, B, A, 1 & 5
0 to
0 to
39.1/78.1
19.5/39.1
0 to
0 to
0 to
9.77/19.5
4.88/9.77
2.44/4.88
E, D, 1 & 5
E, D, A, 1 & 5
E, D, B, 1 & 5
TABLE 2
The frequency output for each range is indicated : 0 to 2500/5000 for example.
This means that the minimum frequency output is 2500 Hz. and the maximum frequency output
is 5000 Hz. Any frequency within the low and high value, can be obtained using the trimmer P3
located on the "MS-55" output module.
6
FREQUENCY OUTPUT RANGE SELECTION
PULSES PER HOUR
Table 3 indicates all the standard available ranges for these models when the frequency output
must be in pulses per hour.
Set the jumpers and solder pads to the position indicated in Table 3. The jumpers are located on
the "MS-55" output module.
If the frequency output range is modified follow the adjustment and calibration procedure for each
model.
CLOSE JUMPERS/
AND SOLDER PADS
PULSES / HOUR
PULSE WIDTH
0 to 4395/8790
0 to 2197/4395
0 to 1099/2197
B, A & 1
C & 1
C, A & 1
0 to
0 to
0 to
0 to
0 to
0 to
0 to
0 to
0 to
0 to
549/1099
275/549
C, B & 1
50 % of the full cycle,
when solder pad 5, is closed.
C, B, A & 1
D & 1
137/275
100 mS.
when solder pad 5, is
opened.
68.7/137
34.3/68.7
17.2/34.3
8.58/17.2
4.29/8.58
2.15/4.29
1.07/2.15
D, A & 1
D, B & 1
D, B, A & 1
D, C & 1
D, C, A & 1
D, C, B & 1
D, C, B, A & 1
TABLE 3
The frequency output for each range is indicated : 0 to 4395/8790 for example.
This means that the minimum frequency output is 4395 Hz. and the maximum frequency output
is 8790 Hz. Any frequency within the low and high value, can be obtained using the trimmer P3
located on the "MS-55" output module.
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SIGNAL INPUT, module ME
OVERVIEW
This module together with the "MP" input board, performs all the input signal conditioning (see
Fig. 2). This module contains the trimmers and jumpers for the amplifier gain and the low level
output (offset).
The signal input connections are made at Terminals 3, 4, 5 and 6.
Each model may use some of these terminals, see the Connections Section.
FIG.7
P1 : Output zero adjustment.
P2 : Gain amplifier adjustment.
1
P1
P2
2
B
A
C
Solder pads on solder side
OFFSET ADJUST
Solder pad 1 if closed : Adjust the low range level of the output (Offset positive coarse).
Solder pad 2 if closed : Adjust the low range level of the output (Offset negative coarse).
Jumper A if closed
: Adjust the low range level of the output (Offset negative fine).
AMPLIFIER GAIN
Jumper B if closed
Jumper C if closed
: Gain at maximum level
: Gain at medium level.
Jumpers B and C opened : Gain at minimum level.
8
CCT-55-V; DC VOLTAGE INTEGRATOR
ELECTRICAL FEATURES
INPUT
Table 4 indicates all the standard available ranges for the CCT-55-V and its electrical
specifications. The position of the jumpers are indicated in Fig. 8.
For different signal ranges, contact the engineering department for more information.
Reference
A
B
C
D
E
Range
0 to 100 mV
10 mV
0 to 1 V
0.1 V
0 to 10 V
1 V
0 to 100 V
10 V
0 to 650 V
100 V
Min. input span *
Impedance
Overvoltage
100 KΩ
25 V
100 KΩ
75 V
1 MΩ
1,000 V
The minimum input span is the minimum difference between the maximum and minimum
*
input for a full scale output.
TABLE 4
OUTPUT
FREQUENCY : Pulses per second
0 to 10,000 (12 selectable ranges)
0 to 8,790 (13 selectable ranges)
24 Vdc @ 20 mA maximum
100 mA. (24 Vdc external power supply)
100 ms; 50 % of the full cycle or
variable with frequency ratio
≤ 0.2 % FS
Pulses per hour
TYPE OF PULSES : Voltage
Sink Current
PULSE WIDTH
ACCURACY
RESPONSE TIME
GALVANICISOLATION
≤ 250 ms
Input, Output and Power Supply are all isolated
to 2 kVeff. 50 Hz/1 m.
GENERAL SPECIFICATIONS
STORAGE TEMPERATURE
OPERATING TEMPERATURE
TEMPERATURECOEFFICIENT
STANDARD POWER SUPPLY
POWER CONSUMPTION
TEST VOLTAGE
-30° to +80°C
-10° to +60°C
≤ 0.015 %/°C
115 Vac (±10%) 50/60 Hz
≤ 1.5 VA
4 kVeff. 50 Hz/1m.
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SIGNAL INPUT RANGE SELECTION
Set the jumpers to the position indicated in Table 5 for each range. The jumpers are located
on the "MP" input board. See Fig. 8.
If the signal input range is modified, follow the adjustment and calibration procedure.
JUMPERS
RANGE SELECTION
on components
side. Snap-on type
D
C
B
A
INPUT
CLOSE
RANGE
JUMPER
FIG.8
"MP"
board
Components
side
Input
0 to 100 mV
0 to 1 V
0 to 10 V
0 to 100 V
0 to 650 V
A
------
------
D
B
TABLE 5
ADJUSTMENT AND CALIBRATION PROCEDURE
1. When input and output signal values are determined, remove the conditioner case. (Fig. 1).
2. Check on the "MA" module, if the selected power supply is correct. (Table 1).
3. Select on the input board the desired Voltage range, according to Table 5.
Caution : Do not confuse the jumpers on the "MP" board with the jumpers on the "ME" module,
(all of the jumpers on the "ME" board must be opened).
Close on "MS-55" output module, jumper E & solder pad 1, and open the jumpers A, B, C &
and solder pads 2 & 5, according to Tables 2 and 3.
D
4. Connect the calibrator to the conditioner terminals
: 4 and 6 for signal > 1 V.
: 5 and 6 for signal < 1 V.
5. Connect a digital voltmeter to the jumper "J4" located on the "MS-55 output module.
6. Power up the signal conditioner with the appropriate power supply.
7. Adjust the calibrator until it generates the low signal level.
8. Check the voltmeter reading is 0. If not, turn the trimmer P1, located on the "ME" input module,
until the reading of the voltmeter is 0.
9. Adjust the calibrator until it generates the high signal level.
10. Check the voltmeter reading is 10.0 V. If not, turn the trimmer P2, located on the "ME" input
module, until the reading of the voltmeter is 10.0 V.
11. Repeat steps 7 thru 10, until the two values are correct.
12. Connect a digital frequency meter, to the signal output terminals 11 and 12. The reading must
be between 2500/5000 Hz.
13. Select on the "MS-55" output module, the corresponding jumpers, according to Tables 2 & 3.
14. Adjust the calibrator until it generates the high signal level and turn the SPAN trimmer (P3),
located on the "MS-55" output module, until the frequency meter shows the desired output
frequency.
15. Disconnect the conditioner and the instruments used and reinsert into the case.
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CCT-55-I : DC CURRENT INTEGRATOR
ELECTRICAL FEATURES
SIGNAL INPUT
Table 6 indicates two standard available ranges for the CCT-55-I and its electrical specifications.
Using the jumpers located on the "MP" input board and "ME" input module, 4 different ranges may
be selected ( see Table 7).
For other signal ranges, contact the engineering department for more information.
Reference
A
B
TABLE 6
Input range
Min. input Span *
Impedance
Overload
0 to 5 mAdc
0.5 mAdc
20 Ω
0 to 50 mAdc
5 mAdc
The minimum input span is the minimum
difference between the maximum and
minimum input for a full scale output.
*
20 Ω
100 mAdc
100 mAdc
OUTPUT
FREQUENCY : Pulses per second
Pulses per hour
TYPE OF PULSES: Voltage
Sink Current
0 to 10,000 (12 selectable ranges).
0 to 8,790 (13 selectable ranges).
24 Vdc @ 20 mA maximum.
100 mA. (24 Vdc external power supply)
100 mS; 50 % of the full cycle or
variable with frequency ratio.
≤ 0.2 % FS.
PULSE WIDTH
ACCURACY
RESPONSE TIME
GALVANICISOLATION
≤ 250 ms.
Input, Output and Power Supply are all isolated
to 2 kVeff. 50 Hz/1 m.
GENERAL SPECIFICATIONS
STORAGE TEMPERATURE
OPERATING TEMPERATURE
TEMPERATURECOEFFICIENT
STANDARD POWER SUPPLY
POWER CONSUMPTION
TEST VOLTAGE
-30° to +80°C.
-10° to +60°C.
≤ 0.015 %/°C.
115 Vac (±10%) 50/60 Hz.
≤ 1.5 VA.
4 kVeff. 50 Hz/1m.
11
SIGNAL INPUT RANGE SELECTION
Set the jumper to the position indicated in the table below for each range. The jumpers are located
on the "MP" input board and "ME" input module. See Fig. 9.
If the signal input range is modified, follow the adjustment and calibration procedure.
"ME" Input module
Components view
"MP" Input board
Components
view
FIG.9
INPUT
Close jumpers on module :
RANGE
MP
ME
D
A
0 to 5mAdc
A & D
--------
C
A & C
-------
A
B
C
0 to 20 mAdc
4 to 20 mAdc
0 to 50 mAdc
D
D
D
TABLE 7
ADJUSTMENT AND CALIBRATION PROCEDURE
1. When input and output signal values are determined, remove the conditioner case. (Fig. 1).
2. Check on the "MA" module, if the selected power supply is correct. (Table 1).
3. Select on the "MP" input board and "ME" input module the desired Current range, according
to
Table 7.
Close on "MS-55" output module, jumper E & solder pad 1, and open the jumpers A, B, C &
and solder pads 2 & 5, according to Tables 2 and 3.
D
4. Connect the calibrator to the conditioner terminals
5 and 6.
5. Connect a digital voltmeter, to the jumper "J4" located on the "MS-55 output module.
6. Power up the signal conditioner with the appropriate power supply.
7. Adjust the calibrator until it generates the low signal level.
8. Check the voltmeter reading is 0. If not, turn the trimmer P1, located on the "ME" input module,
until the reading of the voltmeter is 0.
9. Adjust the calibrator until it generates the high signal level.
10. Check the voltmeter reading is 10.00 V. If not, turn the trimmer P2, located on the "ME" input
module, until the reading of the voltmeter is 10.00 V.
11. Repeat steps 7 thru 10, until the two values are correct.
12. Connect a digital frequency meter, to the signal output terminals 11 and 12. The reading must
be between 2500/5000 Hz.
13. Select on the "MS-55" output module, the corresponding jumpers, according to Tables 2 & 3.
14. Adjust the calibrator until it generates the high signal level and turn the SPAN trimmer (P3),
located on the "MS-55" output module, until the frequency meter shows the desired output
frequency.
15. Disconnect the conditioner and the instruments used and reinsert into the case.
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WIRING CONNECTIONS
-
↑
↓
↑
↓
≤ 1 V
> 1 V
FIG.10
+
CCT-55-V
1
3
4
5
6
H i
POWERSUPPLY
The side label,
shows the type
and value of the
power supply.
INPUT ENTRADA
/
OUTPUTS
mA
/
SALIDAS
Vdc
Lo
7
+
9
-
+
-
10 11 12
+
Vexc
_
LOAD
LOAD
+
-
Transducer
3-wire system
CCT-55-I
signal
-
+
Transducer
2-wire system
+
Current generator signal
-
FIG.11
1
3
4
5
6
H i
POWERSUPPLY
The side label,
shows the type
and value of the
INPUT / ENTRADA
The voltage excitation for the current loop, it
is supplied by the signal conditioner (24 Vdc
@ 25 mA).
Terminals 3 and 5, for 2-wire transducers.
Terminals 3, 5 and 6 for 3-wire transducers.
power supply.
OUTPUTS
mA
/
SALIDAS
Vdc
Lo
7
+
-
+
-
9
10 11 12
+
Vexc
_
LOAD
LOAD
13
MECHANICAL SPECIFICATIONS
DIMENSIONS
1
3
4
5
6
H i
INPUT / ENTRADA
75 mm
(2.952")
36 mm
(1.417")
OUTPUTS
mA
/
SALIDAS
Vdc
Lo
7
+
9
-
+
-
10 11 12
45 mm
(1.771")
110 mm
(4.33")
TECHNICAL DATA
WEIGHT . . . . . . . . . . . . . . . . . . . 270 g.
HOUSING BASE . . . . . . . . . . . . Polycarbonate, RAL 7032, UL 94 V-1 light grey, IP-40
TERMINAL HOUSING, COVER
AND BLIND PLUGS . . . . . . . . . . Polycarbonate, UL 94 V-2 dark grey, IP-20
2
WIRE CROSS SECTION : . . . . . 4 mm
Provided with a snap fastener for attaching to DIN 46277 and DIN EN 50022 (35 x 7.5 mm)
assembly rails.
14
NOTES
15
M ADE
IN
USA
WARRANTY/DIS CLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and
workm anship for a period of 1 3 m o n t h s from date of purchase. OMEGA Warranty adds an
additional one (1) m onth grace period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to
co ve r h a n d lin g a n d s h ip p in g tim e . Th is e n s u re s th a t OMEGA’s cu s to m e rs re ce ive
m axim um coverage on each product.
If the unit should m alfunction, it m ust be returned to the factory for evaluation. OMEGA’s
Custom er Service Departm ent will issue an Authorized Return (AR) num ber im m ediately
upon phone or written request. Upon exam ination by OMEGA, if the unit is found to be
defective it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply
to d e fe cts re s u ltin g fro m a n y a ctio n o f th e p u rch a s e r, in clu d in g b u t n o t lim ite d to
m ishandling, im proper interfacing, operation outside of design lim its, im proper repair, or
unauthorized m odification. This WARRANTY is VOID if the unit shows evidence of having
been tam pered with or shows evidence of being dam aged as a result of excessive corrosion;
or current, heat, m oisture or vibration; im proper specification; m isapplication; m isuse or
other operating conditions outside of OMEGA’s control. Com ponents which wear are not
warranted, including but not lim ited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. How ever,
OMEGA n e it h e r a s s u m e s re s p o n s ib ilit y fo r a n y o m is s io n s o r e rro rs n o r a s s u m e s
liability for any dam ages that result from the use of its products in accordance w ith
inform ation provided by OMEGA, either verbal or w ritten. OMEGA w arrants only that
the parts m anufactured by it w ill be as specified and free of defects. OMEGA MAKES
NO OTHER WARRANTIES OR REP RES ENTATIONS OF ANY KIND WHATS OEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
IN C LU D IN G A N Y WA RRA N TY O F M ERC HA N TA BILITY A N D FITN ES S FO R
A
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The
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w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,
indem nification, strict liability or otherw ise, shall not exceed the purchase price of the
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consequential, incidental or special dam ages.
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1)
as
a
“Basic Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or
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harm less from any liability or dam age whatsoever arising out of the use of the Product(s) in
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RETURN REQUES TS / INQUIRIES
Dire ct a ll w a rra n ty a n d re p a ir re q u e s ts /in q u irie s to th e OMEGA Cu s to m e r S e rvice
Departm ent. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST
OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE
DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR num ber
should then be m arked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging
to prevent breakage in transit.
FOR WARRANTY RETURNS, please have
the following inform ation available BEFORE
contacting OMEGA:
1. P.O. num ber under which the product
was PURCHASED,
2. Model and serial num ber of the product
under warranty, and
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following inform ation available
BEFORE contacting OMEGA:
1. P.O. num ber to cover the COST
of the repair,
2. Model and serial num ber of product, and
3. Repair instructions and/or specific
problem s relative to the product.
3. Repair instructions and/or specific
problem s relative to the product.
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible.
This affords our custom ers the latest in technology and engineering.
OMEGA is
a
registered tradem ark of OMEGA ENGINEERING, INC.
©
Co p yrig h t 1996 OMEGA ENGINEERING, INC. All rig h ts re s e rve d . Th is d o cu m e n t m a y n o t b e co p ie d ,
photocopied, reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or
in part, without prior written consent of OMEGA ENGINEERING, INC.
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ߜ Ⅺ
ߜ Ⅺ
ߜ Rotameters, Gas Mass Flowmeters & Flow Computers
Air Velocity Indicators
Turbine/ Paddlewheel Systems
Totalizers & Batch Controllers
p H/ CO NDUCTIVITY
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ߜ pH Electrodes, Testers & Accessories
Benchtop/ Laboratory Meters
Controllers, Calibrators, Simulators & Pumps
Industrial pH & Conductivity Equipment
DATA ACQ UISITIO N
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ߜ Data Acquisition & Engineering Software
Communications-Based Acquisition Systems
Plug-in Cards for Apple, IBM & Compatibles
Datalogging Systems
Recorders, Printers & Plotters
HEATERS
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ߜ Heating Cable
Cartridge & Strip Heaters
Immersion & Band Heaters
Flexible Heaters
Laboratory Heaters
ENVIRO NMENTAL
MO NITO RING AND CO NTRO L
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ߜ Metering & Control Instrumentation
Refractometers
Pumps & Tubing
Air, Soil & Water Monitors
Industrial Water & Wastewater Treatment
pH, Conductivity & Dissolved Oxygen Instruments
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