ScienceTech 500-75ST User manual

Sciencetech 75W Hg
Light Sources
User's Manual
Version 1.1
October 2016

Contents
1. INTRODUCTION....................................................................................................................3
2. TECHNICAL SPECIFICATIONS –POWER SUPPLY.....................................................4
3. SHIPPING AND UNPACKING.............................................................................................5
3.1 UNPACKING ..............................................................................................................................5
3.2 INCLUDED COMPONENTS ..........................................................................................................5
4. INSTALLATION AND ALIGNMENT.................................................................................6
4.1 BULB INSTALLATION PROCEDURE.............................................................................................6
4.2 LAMP REMOVAL........................................................................................................................7
5. OPERATING INSTRUCTIONS............................................................................................8
6. REPLACEMENT OF FUSES ................................................................................................9
6.1 EXTERNAL FUSES......................................................................................................................9
6.2 INTERNAL FUSE.........................................................................................................................9
7. IMPORTANT NOTICE........................................................................................................11
8. WARRANTY AND ASSISTANCE......................................................................................13

Sciencetech 75W Mercury Light Source Manual
Page 3 of 13
1. Introduction
St-series mercury lamps are stabilized by the geometry of the gas discharge, resulting in an
accurate position of the arc. As a result, the noise is very low - in the order of 0.1%. The most
favorable values of drift and noise are achieved when only the middle part of the light arc is used
as the light source.
The normal operating life for all St-lamp types is 1000 hrs with a reduction of the output of max.
50%. The normal useful operating life can be between 2000 to 4000 hrs. St-lamps should be
mounted with the base down and an inclination from the vertical of less than ±20°. In DC
operation, the lamp must be connected so that the anode is at the bottom.

Sciencetech 75W Mercury Light Source Manual
Page 4 of 13
2. Technical Specifications –Power Supply
POWER SUPPLY Model 500-75ST
Input:
110-115 Vac or 220-230 Vac (selectable), 50 to 60 Hz
Power:
0-100W
Operating Voltage:
0-approx. 88 V
Operating Current:
0-1A (max. current range +/- 5%)
Pre-Ignition Voltage:
> 80 V
Ripple at Maximum Current:
< 1 mV
Stability after Warm-Up:
0.05%
Line Voltage Regulation:
0.02% current variation for 5 V line change
Display:
digital LCD
Dimensions:
5.8" x 9.5" x 14.4" (12.9 cm x 20.9 cm x 31.7 cm)
Weight:
9.86 kg
IGNITER Model 500-IG75ST
Input Voltage Supply Line:
80-120V
Nom. Ignition Voltage:
800V (Pulses 1KHz)
Dimensions:
3.5" x 2.1" x 5.3" (10.5 cm x 5.1 cm x 14.8 cm)
Weight:
0.6 kg

Sciencetech 75W Mercury Light Source Manual
Page 5 of 13
3. Shipping and Unpacking
3.1 Unpacking
The instrument is packaged in such a way as to minimize damage during transport. If the
package is damaged or if after unpacking any signs of damage become apparent, a claim should be
filed with the carrier immediately.
If the instrument must be returned, contact Sciencetech Inc. for approval prior to shipping. A
full description of the reason for return should be included.
Inspect the exterior of all the units of the light source system for any noticeable defects. If any
are present, contact Sciencetech Inc. immediately.
3.2 Included Components
The packing box should contain the following components:
Sciencetech ST75 lamp housing
Sciencetech 500-75ST power supply and 500-IG75ST Igniter
Power supply cable
Lamp fan cable
Requested bulbs

Sciencetech 75W Mercury Light Source Manual
Page 6 of 13
4. Installation and Alignment
4.1 Bulb Installation Procedure
The 75w Hg Light source is an ST75 low pressure mercury lamp. The base, socket and shroud
that hold the lamp are pre-assembled. The only part to install is the bulb itself, which is shipped
separately.
a) Remove the lamp shroud carefully by removing the brass thumbscrew at the bottom front and
sliding the shroud up over the socket.
b) Note that one socket pin is labelled with a red dot (+ve) and one with a black dot (-ve). In the
next step, the +ve and –ve pins on the bottom of the lamp must line up accordingly with the
socket pins polarity.

Sciencetech 75W Mercury Light Source Manual
Page 7 of 13
c) Gripping the metal portion of the lamp base, insert it as shown by carefully pushing down and
then rotating clockwise. Note the orientation of the numbers on the lamp base with respect to
the black anodized aluminum socket baseplate. This shows the lamp with correct polarity
mounting.
d) Very carefully replace the copper lamp housing and secure it with the brass screw at
the bottom as shown in step (a) above.
4.2 Lamp removal
a) Remove the copper lamp shroud by unscrewing the one
screw holding it (see 4.1 (a)).
b) Release the lamp by gripping the metal at the base,
pushing it down and rotating counter clockwise.
c) Always store the lamp in its dedicated box, and avoid
touching the quartz bulb.

Sciencetech 75W Mercury Light Source Manual
Page 8 of 13
5. Operating Instructions
Before operating the lamp the user has to make all cable connections (refer to figures below).
Figure 1 Figure 2
Figure 3
1) Connect the yellow power cable (Figure 1) to the igniter (Figure 3).
2) Connect the lamp housing leads into the igniter (Figure 2). Red to red and black to black.
3) Plug the power supply into your mains power line using the proper cable type (Figure 1).
4) Warning please verify that the Schurter module on the back of the power supply is set to
the AC voltage you are using (120VAC or 220VAC)
To ignite the lamp, set the current dial to about 50% its base value and, ensuring all the
connections are made properly, turn the power switch (Figure 1) to the ON position (-). When
powering off the lamp, turn the current dial down to zero.
The igniter will generate 1 KHz HV pulses to ignite the lamp. Normally, the ST75 arc lamp
ignites within 3-5 seconds. During the ignition process the display will show 110-130V. As soon
as the lamp ignites the display will show 18-22 V. Then the voltage will gradually grow to its
working value of 77-95 V (this takes typically 25-35minutes). Once the lamp has stabilized, the

Sciencetech 75W Mercury Light Source Manual
Page 9 of 13
user may adjust the lamp power to the desired value by using the CURRENT control knob.
IMPORTANT:
NOTE 1: After switching the lamp off, it remains hot. It is recommended that you leave
the cooling circuit on for about 5 more minutes to cool down the housing.
6. Replacement of Fuses
6.1 External Fuses
To access the external fuses (there are two each 250 Volts and 3.2 Amps Slo Blo), carefully pry
the grey plastic fuse drawer out of the black Schurter module on the back of the power supply with
a small slot screwdriver. See image below:
Replace any blown fuses with the same type only. Four spare fuses have been provided with the
power supply.
6.2 Internal Fuse
To access the internal fuse (250Volts, 1.5 Amps, Fast Blo), first remove slide the cover off the
power supply carefully by first removing the three screws that hold it on at the back. The cover
cannot be totally removed as it is tethered by a cable to the fan that is hardwired inside. See the
image below:

Sciencetech 75W Mercury Light Source Manual
Page 10 of 13
The Internal Fuse holder is a black plastic device on the side of the case just under the cover. See
the image below:
Replace a blown fuse with the same type only. Two spare fuses have been provided with the
power supply.

Sciencetech 75W Mercury Light Source Manual
Page 11 of 13
7. Important Notice
All electrical instruments may be dangerous if not handled in accordance with proper
instructions and common precautions. Sciencetech Inc. will not be responsible for any damage
caused by such units if instructions herein are not followed and repairs are not attended to or
performed by company-trained or licensed personnel. All instruments should be operated with
proper grounds on power line and should not be opened or handled as to electrical or
electrically operated components without being switched off and disconnected from power
receptacle.
Sciencetech Inc. reserves the right to make adjustments or improvements in its product
without notice and without obligation to subsequent purchasers and without being required to
make corresponding changes or improvements in products theretofore manufactured and sold.
We have done our very best in the manufacture and packing of this material. The
transportation carrier is now responsible for delivering it to you in its original good condition,
since all purchases are FOB London.
If the shipment is NOT delivered in good order and in accordance with quantity shown on
Bill of Lading or Packing Slip, have the shortage or damage noted by the Carrier on both the
delivery receipt and the freight bill, or by special form provided by United Parcel or the Post
Office.
The Interstate Commerce Commission has ruled that Transportation Companies will not
honor any losses or shortage claims unless exceptions are noted on the freight bill at the time
of delivery. It is the buyer’s responsibility to make a complete inspection immediately upon
receipt of purchased goods.
If you accept shipment from the Transportation Carrier short of what is enumerated on the
Bill of Lading –or in damaged condition –without having proper notation made by the
Carrier, you do so at your own risk.
If bundles or crates are in apparent good order, but on opening contents are found to be
damaged, call Carrier for adjuster to view same and have the Transportation Company/United
Parcel/Post Office mark the freight bill or packing slip relative to such concealed damage.
Make your claim at once for the Transportation Company/United Parcel/Post Office has
a limited time for presentation of claims.
We are willing to assist you in every possible manner in collecting claims for loss or
damage on this shipment, but this willingness on our part does not make us responsible for
filing or collecting claims or replacing materials. Claims for Loss or Damage on shipment may
not be deducted from out invoice, nor pay of the invoice withheld awaiting adjustment of such
claims, as we cannot guarantee safe delivery.
Important: Do not return goods to Sciencetech Inc. without written authorization!

Sciencetech 75W Mercury Light Source Manual
Page 12 of 13
Contact factory for return material authorization.
Returned goods will not be accepted by us from the Transportation Company/United
Parcel/Post Office unless written authorization has been issued by Sciencetech Inc.
Return of special or non-stock items cannot be authorized. Credit for goods returned -
under authorization - will depend on the value to us based on our selling price, less a fair
charge to cover the expense of shipping - re-handling - transportation - refinishing, etc,
providing material is received in good condition - transportation charges prepaid - credit
rendered to be used against future purchases.
All equipment manufactured by Sciencetech Inc. has been subjected to extensive
performance and quality control testing. In order to constantly improve our product, we ask
your assistance. Upon installation of our equipment, please fill out the attached card and return
to us.
By completing the card and returning it to Sciencetech, you will register your instrument in
warranty and enable us to provide you with the best possible service.

Sciencetech 75W Mercury Light Source Manual
Page 13 of 13
8. Warranty and Assistance
All Sciencetech products are warranted against defects in materials and workmanship. This
warranty applies for one year from the date of delivery, or, in the case of certain major
components listed in the operating manual, for the specified period. Products sold or resold,
but not manufactured by Sciencetech, carry the warranty, if any of the original manufacturer.
We will repair or replace products that prove to be defective during the warranty period or
employ our best efforts to effect repair or replacement of equipment sold, but not
manufactured, by Sciencetech. No other warranty is expressed or implied.
We are not liable for consequential damages.
Telephone: [phone].
Fax: [phone]
Email: [email protected]