SCIENTIFIC INSTRUMENTS 1900-7 Manuale utente

090-226 Rev. D

Instruction Manual

For

Model 1900-7 & 1901-7

Temperature Indicator

SCIENTIFIC INSTRUMENTS, INC

090-226 Rev. D

TABLE OF CONTENTS

Paragraph Title Page

SECTION I

GENERAL DESCRIPTION

1.1 INTRODUCTION.....................................

1.2 SPECIFICATIONS...................................

SECTION II

OPERATIONS

2.1 INPUT/OUTPUT CONNECTIONS ................................

2.2 OPERATING PROCEDURES ....................................

2.2.1 ACCESSING SINGLE POINT CALIBRATION MODE

.........

2.2.2 ACCESSING SET POINT MODE (MODEL 1901 ONLY).......

2.2.3

2.2.4 ACCESSING THE DIAGNOSTIC SUBROUTINE

Default Readouts.................................

2.3 CALIBRATION PROCEDURES ..................................

2.3.1 ACCESSING EPROM SENSOR CURVE DATA

...............

2.3.2 SETTING OF REFERENCE VOLTAGE

....................

2.4 RS232 OPERATIONAL (MODEL 1901 ONLY)

....................

2.4.1 TEMPERATURE DATA.................................

2.4.2 SETPOINT DATA....................................

DRAWINGS

OUTLINE/MOUNTING SPECIFICATIONS

......................... A020-098-1

SECTION I

GENERAL DESCRIPTION

1.1 INTRODUCTION

The Model 1900 Microprocessor-Based Temperature Indicator is a 3-digit

instrument designed to operate in conjunction with a ruthenium oxide

sensor to furnish accurate temperature measurement over the range of

1.5 to 273K. Different Models of the ruthenium oxide sensor can be

accommodated. These are:

a. Scientific Instruments, Inc. Model RO-105 (100K)

b. Scientific Instruments, Inc. Model RO-701GE (1K)

c. Scientific Instruments, Inc. Model RO-600 (1K)

Each Model has its own software that has been factory programmed at the time

of order.

Typical voltage vs. temperature data for these specific sensors is stored in

internal EPROMS to match the instrument to the actual sensor being used.

Model 1901 Indicator has the added features of two alarm set points, two

associated alarm relay outputs, and an RS232C interface port. A 0 to 1 or 4

volt DC analog output is also available as an option.

Two front-panel switches enable the user to access a “Single Point

Calibration” (SpCal) function and to set the temperature alarm points. The

SpCal function is a selectable positive or negative offset, which is applied

to the temperature reading.

1.2 SPECIFICATIONS

Sensor Excitation

10 Microamperes Constant Current

Display

3-Digit LED

Temperature Range

1.5 to 300K

Resolution 0.1K from 1.5 to 99.9K

1.0K from 100 to 273K

Accuracy (SpCal)* +/- 0.15K from 1.5 to 80K

+/- 0.15K to +/- 5.0%(80K to 273K)

Power Required 9 VDC @ 500 ma., via a furnished 100-240

VAC/9VDC power converter.

Alarm Setpoints (1901 only) Two, via front panel switches

Alarm Outputs (1901 only) Two SPDT Relays (C, NO, NC)

28 VDC @ 0.25A

RS232 Interface (1901 only) a) Output of Temperature

b) External Setting of Alarm Setpoints

Analog Output (1901 Option) 0 to 1 or 4 volt DC, corresponding to

0 to 273K (2K ohm minimum load)

* Single-Point Calibration (SpCal) is an integrated calibration function

which enables the user to achieve the highest possible system accuracy at the

most important temperature point.

090-226 Rev. D 3

SECTION II

OPERATION

2.1 INPUT/OUTPUT CONNECTIONS

All input and output connections are made at the rear panel of the

instrument:

a) Insert the plug from the power converter into the receptacle at

the extreme right-hand side of the rear panel.

b) Wire the ruthenium oxide sensor to the furnished 5-pin plug

as follows:

Insert this plug into its corresponding receptacle on the rear

panel.

c) Connect the conductors of the RS232 modular IDC cable assembly

(Model 1901 only), to the host computer or terminal as follows:

BLK – Ground GRN – Receive (In)

RED – Transmit (Out) YEL – (No Connection)

Insert the cable assembly receptacle into the RS232 port

located at the extreme left-hand side of the rear panel.

d) The alarm relay outputs are available at the 6-pin terminal

block (Model 1901 only). Pin assignments are as follows:

1 – Relay #1 NO 4 – Relay #2 NO

2 – Relay #1 C 5 – Relay #2 C

3 – Relay #1 NC 6 – Relay #2 NC

e) The analog output is available at the miniature double

banana jack.

090-226 Rev. D 4

2.2 OPERATING PROCEDURES

Several moments after power is applied to the instruments, it will assume

its principal mode of operation which is to display temperature as sensed

by the associated ruthenium oxide sensor. If desired, the operator can:

a) Access the single point calibration mode,

b) change temperature set points (if the instrument is a

Model 1901), and

c) access a special diagnostic subroutine to check

operational readiness of the instrument.

The following paragraphs describe how all of these functions are

accomplished.

2.2.1 Accessing Single Point Calibration Mode

a) Before applying power, press and hold the red “up”

switch. Apply power and release the “up” switch. The

temperature readout will not display the current single

point calibration value.

b) To change this value, immediately press and hold both

“up” and “down” switches. When the readout begins to

flash, release both switches and press the “up” switch

to increase the calibration setting or the “down” switch

to decrease the setting. When either switch is pressed

once and released, the calibration value changes by one

unit. If either switch is held for one second, the value

changes rapidly.

c) Three seconds after either switch is released, the

calibration value is stored (and displayed for an

additional two seconds), and then temperature is

displayed again.

Accessing Set Point Mode (Model 1901 only)

2.2.2

NOTE: The function of the set points is to control operation

of the two internal alarm relays. If the temperature rises

to, or above the set point established for a given relay

(i.e., set point #1 for relay #1; set point #2 for relay #2),

that relay will energize. If the temperature falls below the

set point, that relay de-energizes.

a) With the instrument in its normal mode of operation (i.e.

displaying temperature), press and release the “up”

switch to display set point #1 or the “down” switch to

display set point #2.

090-226 Rev. D 5

b) To change either set point, press and release the

appropriate switch, then immediately press and hold both

the “up” and “down” switches. When the readout begins to

flash, increase the set point by pressing the “up”

switch or decrease the set point by pressing the “down”

switch. When either switch is pressed and released once,

the set point changes by one unit. If either switch is

held for one second, the value changes rapidly.

c) Three seconds after switch is released, the new set point

is stored (and displayed for an additional two seconds),

and then temperature is displayed again.

2.2.3 Accessing the Diagnostic Subroutine

a) Before applying power, press and hold the “down” switch.

Apply power and release the “down” switch. The

instrument will now enter the diagnostic subroutine and

all eight segments of all readout decades will be

displayed.

b) Press the “down” switch again. The instrument will

display a legend designating which particular ruthenium

oxide curve is being used in the temperature calculation

software. Legends are as follows:

105 – Scientific Instruments, Inc. Model RO-105

701 – Scientific Instruments, Inc. Model RO-701GE

600 - Scientific Instrument's, Inc. Model RO-600

c) Press the “down” switch again. The instrument will

display the version of software in the instrument.

d) Press the “down” switch again. The instrument will

display a “d1” legend and output 0 volts at the analog

output (assuming this option is installed).

e) Press the “down” switch again. The instrument will

display a “d2” legend and output 1 or 4 +/- 0.010 volts

at the analog output.

f) Press the “down” switch once more to return the

instrument to its normal display of temperature.

2.2.4 Default Readouts

a) ‘000’ Indicates an open Sensor.

b) ‘555’ Indicates a possible shorted input or that the

input is outside the range of the instrument.

090-226 Rev. D 6

2.3 CALIBRATION PROCEDURES

CAUTION: THE FOLLOWING PROCEDURE IS PERFORMED BY SCIENTIFIC

INSTRUMENTS, INC. AND IS USUALLY ONLY NECESSARY DURING

INITIAL SET-UP OF THE INDICATOR AT THE TIME OF ORDER. IT

HAS BEEN INCLUDED IN THIS MANUAL FOR INFORMATIONAL PURPOSES

ONLY AND IS NOT NECESSARY FOR ROUTINE USE.

By means of the front panel switches, the operator can access the sensor

curve data stored in the internal EPROMs and select a different curve, if

desired. In addition, through the use of a sensor simulator, the operator

can reset an internal reference voltage. The following paragraphs describe

how these functions are accomplished.

2.3.1 Accessing EPROM Sensor Curve Data

CAUTION: SELECTING THE ALTERNATE SENSOR CURVE REQUIRES BOTH CHANGING

THE SENSOR AND ALSO ADDITIONAL HARDWARE CHANGES WITHIN THE

INDICATOR.

a) Before applying power, press and hold both the “up” and

“down” switches. Apply power. After two seconds, release

both switches, then press and hold the “up” switch. After

two seconds, release the “up” switch and then press and

hold it again for two seconds.

b) When the “up” switch is released, the applicable legend

will be displayed to signify which ruthenium oxide c

rve is

being used. The display will flash for two seconds if

neither switch is again pressed.

NOTE: The display will cycle through its programmed

operations (briefly showing reference voltage) until the

legend “CAL” is displayed. At that time, remove power

unless a different curve is to be selected.

c) To select a different curve, press and release either the

“up” or “down” switch while the display is flashing. At

this time, the next sequential legend will be displayed.

Subsequent pressing and releasing of either switch will

cause the instrument to toggle through each curve legend.

When the desired legend is displayed, do not press either

switch; simply wait until the display cycles through its

programmed operations until the legend “CAL” is displayed.

At that time, remove power and the selected curve will be

entered into memory.

WARNING: DO NOT PRESS BOTH SWITCHES WHEN THE “CAL” LEGEND IS

DISPLAYED, OTHERWISE THE INSTRUMENT WILL RECALIBRATE ITSELF AND ITS

TEMPERATURE READINGS WILL NO LONGER BE VALID.

090-226 Rev. D 7

2.3.2 Setting of Reference Voltage

a) Connect a 1 Megohm decade resistance box (General Radio

Model 1433-B, or equivalent) to the sensor input

receptacle in lieu of the 100K ruthenium oxide sensor.

Use a 10K ohm decade resistance box (General Radio Model

1433-W, or equivalent for the 1K sensor.

b) Connect a digital voltmeter (Fluke Model 8840A, or

equivalent) across the decade box terminals.

c) Perform steps “a” and “b” of paragraph 2.3.1.

d) When the legend “CAL” is displayed, set the simulated

sensor input to 1.000 +/- 0.005 volts by means of the 1

Megohm decade box set to 100K ohms. This will calibrate

the 100K Ruthenium Oxide Sensor..

e) Press both the “up” and “down” switches. The instrument

will then accept this new reference voltage (1.2xxx)and

return to the temperature display.

WARNING: PERFORM THIS PROCEDURE ONLY WITH A 1.000 VOLT

INPUT, OTHERWISE INACCURATE TEMPERATURES WILL BE

DISPLAYED.

f) To calibrate the 1K sensor, perform steps A through C

and E using the 10K ohm decade box set at 1K ohms. The

voltage across the box terminals should be .010 +.0001

olts.v

WARNING: PERFORM THIS PROCEDURE ONLY WITH A 10 MV INPUT,

OTHERWISE INACCURATE TEMPERATURES WILL BE DISPLAYED.

2.4 RS232 OPERATIONAL (Model 1901 Only)

a) Connect the conductors of the RS232 modular IDC cable assembly

to the computer as follows:

BLK – Ground GRN – Receive (In)

RED – Transmit (Out) YEL – (No Connection)

Insert the cable assembly receptacle into the RS 232 port

located at the extreme left-hand side of the rear panel.

b) Set the computer to a baud rate of 9600, no parity, 8 data bits

and 1 stop bit.

2.4.1 Temperature Data

a) The Model 1901 will transmit the current temperature

reading to the host computer when a “T” and carriage

return ..<CR>.. are received.

NOTE: The instrument responds to both uppercase and

lowercase letters.

090-226 Rev. D 8

090-226 Rev. D 9

2.4.2 Setpoint Data

a) The Model 1901 will accept a new alarm setpoint value

for the selected relay when the host computer transmits

the following code:

S1, N, <CR>

in which:

S1 indicates that the setpoint is for relay #1.

(S2 is used for relay #2).

N is the temperature setpoint in degrees Kelvin (to

tenths of degree resolution), with the least

significant digit being the tenth’s digit.

<CR> is a carriage return.

EXAMPLE: A setpoint value of 12.3K for relay #2 should be

transmitted as:

S2, 123, <CR>

Since the maximum range of the instrument is 273 Kelvin, the

largest alarm setpoint value that will be interpreted

correctly is 2730.

b) The Model 1901 will transmit the current setpoint value

for the selected relay when the host computer transmits

the follow code:

S1, <CR> or S2, <CR>

as applicable.

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