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DIGITAL CONDUCTIVITY METER SERVICE MANUAL
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 1 OF 14
MODEL 1152 SERVICE MANUAL
EMCEE ELECTRONICS, INC.
520 CYPRESS AVENUE
VENICE, FL 34285
(941) 485-1515
FAX 941-488-4648
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 1 OF 14
MODEL 1152 SERVICE MANUAL
EMCEE ELECTRONICS, INC.
520 CYPRESS AVENUE
VENICE, FL 34285
(941) 485-1515
FAX 941-488-4648
DIGITAL CONDUCTIVITY METER SERVICE MANUAL
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 2 OF 14
TABLE OF CONTENTS
PAGE
1.0 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . 3
2.0 TEST EQUIPMENT REQUIREMENTS . . . . . . . . . . . . . 3
3.0 PRELIMINARY CALIBRATION CHECK . . . . . . . . . . . . 3
4.0 BATTERY REPLACEMENT . . . . . . . . . . . . . . . . . 4
5.0 CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . 4
6.0 TROUBLE SHOOTING CHART . . . . . . . . . . . . . . . 6
7.0 CALIBRATION . . . . . . . . . . . . . . . . . . . . . 6
8.0 TEST PROCEDURE . . . . . . . . . . . . . . . . . . . 7
9.0 PARTS LIST . . . . . . . . . . . . . . . . . . . . . 8
10.0 ILLUSTRATIONS
FIGURE 1 METER AND PROBE . . . . . . . . . . . . . 9
FIGURE 2 PROBE ATTACHMENT . . . . . . . . . . . . . 9
FIGURE 3 PROBE CALIBRATION NO. . . . . . . . . . . 9
FIGURE 4 OPERATING POSITION . . . . . . . . . . . .10
FIGURE 5 CALIBRATION MODE . . . . . . . . . . . . .10
FIGURE 6 MEASURE MODE . . . . . . . . . . . . . . .10
FIGURE 7 ACCESSORY CABLE REEL . . . . . . . . . . .11
FIGURE 8 REEL - METER ATTACHMENT . . . . . . . . .11
FIGURE 9 METER INTERNAL VIEW . . . . . . . . . . .12
FIGURE 10 PC BOARD ASSEMBLY . . . . . . . . . . . .13
FIGURE 11 CALIBRATION ACCESSORY . . . . . . . . . .13
FIGURE 12 SCHEMATIC DIAGRAM . . . . . . . . . . . .13
SERVICE AND WARRANTY POLICY
See Service & Warranty Manual
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 2 OF 14
TABLE OF CONTENTS
PAGE
1.0 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . 3
2.0 TEST EQUIPMENT REQUIREMENTS . . . . . . . . . . . . . 3
3.0 PRELIMINARY CALIBRATION CHECK . . . . . . . . . . . . 3
4.0 BATTERY REPLACEMENT . . . . . . . . . . . . . . . . . 4
5.0 CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . 4
6.0 TROUBLE SHOOTING CHART . . . . . . . . . . . . . . . 6
7.0 CALIBRATION . . . . . . . . . . . . . . . . . . . . . 6
8.0 TEST PROCEDURE . . . . . . . . . . . . . . . . . . . 7
9.0 PARTS LIST . . . . . . . . . . . . . . . . . . . . . 8
10.0 ILLUSTRATIONS
FIGURE 1 METER AND PROBE . . . . . . . . . . . . . 9
FIGURE 2 PROBE ATTACHMENT . . . . . . . . . . . . . 9
FIGURE 3 PROBE CALIBRATION NO. . . . . . . . . . . 9
FIGURE 4 OPERATING POSITION . . . . . . . . . . . .10
FIGURE 5 CALIBRATION MODE . . . . . . . . . . . . .10
FIGURE 6 MEASURE MODE . . . . . . . . . . . . . . .10
FIGURE 7 ACCESSORY CABLE REEL . . . . . . . . . . .11
FIGURE 8 REEL - METER ATTACHMENT . . . . . . . . .11
FIGURE 9 METER INTERNAL VIEW . . . . . . . . . . .12
FIGURE 10 PC BOARD ASSEMBLY . . . . . . . . . . . .13
FIGURE 11 CALIBRATION ACCESSORY . . . . . . . . . .13
FIGURE 12 SCHEMATIC DIAGRAM . . . . . . . . . . . .13
SERVICE AND WARRANTY POLICY
See Service & Warranty Manual
DIGITAL CONDUCTIVITY METER SERVICE MANUAL
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 3 OF 14
1.0 GENERAL DESCRIPTION
1.1 The Emcee Digital Conductivity Meter model 1152 as shown in Figure 1 is
a hand held, battery operated, instrument for determining the conductivity of
fuel samples. Technically, the instrument is a high range ohmmeter capable
of reading between 500 megohms (2000 CU) and infinity (0 CU).
1.2 The controls as shown in Figure 1 consist of a pushbutton switch marked
M (measure) and a pushbutton switch marked C (calibrate).
1.3 Figure 2 shows the instrument with the probe attached and ready for fuel
test.
1.4 Figure 6 shows the instrument in operation with the probe in a fuel
sample.
1.5 The Accessory Cable Kit is shown in Figure 7 and 8. With this reel the
instrument can be used to test fuel in a large storage tank.
1.6 Figure 10 shows the instrument with the back removed, and the plug in
pre-amp and analog to digital PC boards removed.
1.7 Figure 11 shows the CU Substitution Box for complete calibration.
2.0 TEST EQUIPMENT REQUIREMENTS
2.1 CU Substitution Box
2.2 Digital Voltmeter, 10 megohm impedance 0-1 volt +/- .001 0-20 volt
+/- .01.
3.0 PRELIMINARY CALIBRATION CHECK
3.1 Attach probe to bottom connector on the conductivity meter.
3.2 Depress measure switch (marked M). The display should indicate 000 +/-
001 after 3 seconds. If the display does not indicate 000 +/- 001 remove the
probe and recheck for zero. If the meter will zero without the probe but not
with the probe, the probe should be rinsed with isopropyl alcohol and allowed
to air dry before retesting. If the meter will not zero without probe,
proceed to calibration procedure.
3.3 Depress calibration switch (marked C). The display should
indicate the number on the probe (Figure 3) times 10 +/- 005.
Example: Probe No. = 42
Display = 415 – 425
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 3 OF 14
1.0 GENERAL DESCRIPTION
1.1 The Emcee Digital Conductivity Meter model 1152 as shown in Figure 1 is
a hand held, battery operated, instrument for determining the conductivity of
fuel samples. Technically, the instrument is a high range ohmmeter capable
of reading between 500 megohms (2000 CU) and infinity (0 CU).
1.2 The controls as shown in Figure 1 consist of a pushbutton switch marked
M (measure) and a pushbutton switch marked C (calibrate).
1.3 Figure 2 shows the instrument with the probe attached and ready for fuel
test.
1.4 Figure 6 shows the instrument in operation with the probe in a fuel
sample.
1.5 The Accessory Cable Kit is shown in Figure 7 and 8. With this reel the
instrument can be used to test fuel in a large storage tank.
1.6 Figure 10 shows the instrument with the back removed, and the plug in
pre-amp and analog to digital PC boards removed.
1.7 Figure 11 shows the CU Substitution Box for complete calibration.
2.0 TEST EQUIPMENT REQUIREMENTS
2.1 CU Substitution Box
2.2 Digital Voltmeter, 10 megohm impedance 0-1 volt +/- .001 0-20 volt
+/- .01.
3.0 PRELIMINARY CALIBRATION CHECK
3.1 Attach probe to bottom connector on the conductivity meter.
3.2 Depress measure switch (marked M). The display should indicate 000 +/-
001 after 3 seconds. If the display does not indicate 000 +/- 001 remove the
probe and recheck for zero. If the meter will zero without the probe but not
with the probe, the probe should be rinsed with isopropyl alcohol and allowed
to air dry before retesting. If the meter will not zero without probe,
proceed to calibration procedure.
3.3 Depress calibration switch (marked C). The display should
indicate the number on the probe (Figure 3) times 10 +/- 005.
Example: Probe No. = 42
Display = 415 – 425
DIGITAL CONDUCTIVITY METER SERVICE MANUAL
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 4 OF 14
4.0 BATTERY REPLACEMENT
4.1 The model 1152 Conductivity Meter has an internal battery checking
circuit. If batteries are weak the meter will read for a short time and shut
itself off. If batteries are very low the unit will not turn on.
4.2 When battery replacement is indicated remove the 4 screws holding the
back plate exposing the battery housing at the top of the meter.
4.3 Remove the 2 screws on the battery housing and set housing cover to one
side (Figure 10).
4.4 Observe the polarity markings and insert three new batteries as shown in
Figure 10. Battery replacement must be (3) 6 volt Alkaline Nema 1414A Emcee
P/N 152-90-5341. Any other battery replacement will invalidate the CSA and
UL Intrinsically Safe Rating.
4.5 Replace back panel, check zero and calibration.
5.0 CIRCUIT DESCRIPTION
5.1 Power Supply The model 1152 Digital Conductivity Meter uses (3) A-554 6
volt batteries as a single 18 volt power source. Depressing either the
measure or calibrate switches provides power to op amp 1 via D(1) or D(2).
Op amp 1A compares the battery voltage to a positive output at 6 volt zener
reference (ZD-1) and provides a positive output at pin 1 if the battery
voltage is above 13 volts. This insures adequate voltage for good regulation
via VR-1. VR-1 provides a +10 volt (pin 1) and a +5 volt (pin 2) output in
reference to pin 4. The +5 volt (pin 2) output in reference to pin 4. The
+5 volt output is buffered with op amp 1B. The 0 level reference voltage is
developed using the output on op amp 1B pin 7. From this reference point we
now have a +5 volt source and a -5 volt source.
The 0 reference voltage is not attached to the case. Resistors R-15 and R-16
make up a voltage divider to provide a -1 volt source which is tied to the
case. The -1 volt becomes the bias voltage for the fuel probe.
5.2 CALIBRATE REFERENCE - The calibrate voltage is supplied by Q-1 and is
adjustable from 0 to -1 volt. Q-1 is biased on in a saturation mode via R-14
when the calibrate switch is depressed. The collector output is divided by
R-21 and R-20 and the adjustable voltage is passed on to the pre-amp. When
the measure switch is depressed R-13 reverse biases Q-1 and turns Q-1 off.
This action guarantees a 0 volt potential to the pre-amp calibrate input.
The information contained in the accompanying document is proprietary and confidential, and may not be copied in any manner whatsoever without prior written consent of Emcee Electronics,
Inc. The document and the material therein may not be used for any purpose other than that intended by Emcee Electronics, Inc.
COPYRIGHT 2002 EMCEE ELECTRONICS, INC.
REVISION DATE: FEBRUARY 23, 1996
PAGE 4 OF 14
4.0 BATTERY REPLACEMENT
4.1 The model 1152 Conductivity Meter has an internal battery checking
circuit. If batteries are weak the meter will read for a short time and shut
itself off. If batteries are very low the unit will not turn on.
4.2 When battery replacement is indicated remove the 4 screws holding the
back plate exposing the battery housing at the top of the meter.
4.3 Remove the 2 screws on the battery housing and set housing cover to one
side (Figure 10).
4.4 Observe the polarity markings and insert three new batteries as shown in
Figure 10. Battery replacement must be (3) 6 volt Alkaline Nema 1414A Emcee
P/N 152-90-5341. Any other battery replacement will invalidate the CSA and
UL Intrinsically Safe Rating.
4.5 Replace back panel, check zero and calibration.
5.0 CIRCUIT DESCRIPTION
5.1 Power Supply The model 1152 Digital Conductivity Meter uses (3) A-554 6
volt batteries as a single 18 volt power source. Depressing either the
measure or calibrate switches provides power to op amp 1 via D(1) or D(2).
Op amp 1A compares the battery voltage to a positive output at 6 volt zener
reference (ZD-1) and provides a positive output at pin 1 if the battery
voltage is above 13 volts. This insures adequate voltage for good regulation
via VR-1. VR-1 provides a +10 volt (pin 1) and a +5 volt (pin 2) output in
reference to pin 4. The +5 volt (pin 2) output in reference to pin 4. The
+5 volt output is buffered with op amp 1B. The 0 level reference voltage is
developed using the output on op amp 1B pin 7. From this reference point we
now have a +5 volt source and a -5 volt source.
The 0 reference voltage is not attached to the case. Resistors R-15 and R-16
make up a voltage divider to provide a -1 volt source which is tied to the
case. The -1 volt becomes the bias voltage for the fuel probe.
5.2 CALIBRATE REFERENCE - The calibrate voltage is supplied by Q-1 and is
adjustable from 0 to -1 volt. Q-1 is biased on in a saturation mode via R-14
when the calibrate switch is depressed. The collector output is divided by
R-21 and R-20 and the adjustable voltage is passed on to the pre-amp. When
the measure switch is depressed R-13 reverse biases Q-1 and turns Q-1 off.
This action guarantees a 0 volt potential to the pre-amp calibrate input.
5
6
7
8
9
10
11
12
13
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Key Features
- Handheld, battery-operated
- Measures fuel conductivity
- High-range ohmmeter
- Probe included
- Digital display
- Calibration feature
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Frequently Answers and Questions
What is the purpose of the Emcee Digital Conductivity Meter Model 1152?
The Emcee Digital Conductivity Meter Model 1152 is used to measure the conductivity of fuel samples.
How do I calibrate the Emcee Digital Conductivity Meter Model 1152?
The calibration procedure is described in detail in section 7.0 of the manual. It involves using a CU substitution box and adjusting specific potentiometers on the meter.
What are the battery requirements for the Emcee Digital Conductivity Meter Model 1152?
The meter uses three 6 volt Alkaline Nema 1414A batteries (Emcee P/N 152-90-5341). Replacing them with any other battery type will void the CSA and UL Intrinsically Safe Rating.
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