Career opportunity with OTM: sales executive

We are looking for a sales executive for better sales flow and customer experience.

About us

OTM Solutions Pte Ltd was founded in 2013, with the following two operations:

  • Optical & thermal testing laboratory: we provide third-party material testing services to the building & construction industry (e.g. architectural glass optical properties, insulation material thermal conductivity). Our lab is SAC-SINGLAS accredited and with customers from more than 20 countries.
  • Instrumentation services: we are also the distributor of a well-established instrument manufacturer. We supply measurement instruments (e.g. weather stations and data loggers) and provide integration and measurement services.

For more details, please visit our website:

Job description

We are looking for a sales executive, with the following duties:

  • Pre-sales enquiries: communicate with customers on service/product specifications. Technical knowledge on our services/products is required. Training will be provided.
  • Official sales documents: generate official documents (e.g. quotation, tax invoice, delivery order) required a in typical sales cycle.
  • Post-sales coordination: communicate with customers on job progress and other customer enquiries (e.g. customer feedback and satisfaction survey).
  • Sales records: maintain sales related records in the Customer Relationship Management (CRM) system and other relevant tools (e.g. customer loyalty program, sales records).
  • Quality document management: help laboratory manager maintain quality documents (i.e. standard operating procedures, SOPs) and attend quality audits. Training will be provided.

Job requirements

  • Education: diploma or degree is preferred
  • Language skills: proficient in English (both oral and written) is essential, most communications with customers will be over phone and emails
  • Computer skills: emailing with MS outlook, document editing with MS Word & Excel, quoting and invoicing with software (training will be provided)
  • Professional working and learning attitude: able to learn and comprehend our service/product specifications, able to comply with company requirements
  • Good inter-personal skills and responsive
  • Willingness in working in small size company
  • Able to work in Woodlands area
  • We welcome fresh graduates to apply

Employment Benefits

  • Fixed basic salary with sales incentives and performance bonus
  • Short office hours (Monday to Friday, 9am – 4pm)
  • 14 days of annual leave
  • Medical benefits

How to apply

Please email your CV and cover letter to If you are shortlisted, we will contact you within 1 week.

Import user IGDB format file into LBNL Optics

On customers’ requests, we can provide the IGDB format files of the glass samples tested by us. Shown below is a screenshot of an IGDB format file:

The IGDB format file can be imported into LBNL Optics and WINDOW for further calculations.

For more detailed operations of the two software tools, please visit the respective help documents. The steps of importing user IGDB format file into LBNL Optics is described below.

Step 1. Create a new Optics user database

Use “Datebase” -> “Create new user database” to create a new user database file *.mdb.

When asked “Do you want to switch to this new (empty) database?”, click “Yes”.

Step 2. Import the IGDB format file

Use “File” -> “Import Text File(s)…” to import the IGDB format file.

Particulate matter (PM1.0, PM2.5 & PM10) measurement with PMsense and wireless data logger

A system was integrated by OTM for construction site particulate matter (PM1.0, PM2.5 & PM10) measurement, with the following components:

  • Delta Ohm PMsense-M particulate matter transmitter with MODBUS-RTU output
  • Delta Ohm HD35EDW-MB wireless data logger supporting MODBUS-RTU output

Listed below are the key specifications:

  • PM measuring principle: laser scattering
  • Calibration certificate can be provided on additional cost
  • Measuring range: 0 – 1000 μg/m3 for each component
  • IP67 protection for both transmitter and data logger, suitable for outdoor installation
  • Wireless connection between data logger and base unit
Left: PMsense-M, right: HD35EDW-MB
Software screenshot

Online luminance contrast calculator V1.0.0

We are pleased to introduce our online luminance contrast calculator (V1.0.0, first version). Click the screenshot below to access this online calculator.

The calculation principle of this calculator is similar to the online total daylight calculator. The luminous reflectances of the two sRGB colors selected are calculated with color space conversion. The luminance contrast is then calculated from the two luminous reflectance results.

Online total daylight reflectance calculator: V1.0.0

We are pleased to introduce our online total daylight reflectance calculator (V1.0.0, first version). Click the screenshot below to access this online calculator.

Calculation principle

The calculator simply converts an sRGB color (common in screen displays and websites) to a CIEXYZ color, whose Y component is equivalent to the total daylight reflectance of the color (refer to this Wikipedia article for more details).

This calculator calculates total daylight reflectance only and it cannot calculate diffuse and specular daylight reflectances, as the latter two components are dependent on surface finishing, but not on surface color.

The conversion is a theoretical conversion and does not introduce conversion errors. In practice, one needs to manually match a physical color with screen displayed color. This manual process introduces some errors. Nevertheless, this online tools is still useful in estimating the total daylight reflectance of color samples.

20% total daylight reflectance

BCA requires that, for roof surfaces with greater than 20° inclination angle, the total daylight reflectance shall be less than 20% (What is daylight reflectance?). The table below lists 4 colors (grey, red, green, and blue) with close to 20% total daylight reflectance.

If your color is brighter than the 4 colors (except blue color, read the explanation below the table), it is possible that it cannot meet the 20% requirement.

Color typeColor valueTotal daylight reflectanceColor display
GreyRGB (123, 123, 123)
Hex (#7B7B7B)
0.198 (19.8%)
RedRGB (248, 0, 0)
Hex (#F80000)
0.200 (19.8%)
GreenRGB (0, 144, 0)
Hex (#009000)
0.199 (19.9%)
BlueRGB (0, 0, 255)
Hex (#0000FF)
0.072 (7.2%)

Human eyes are less sensitive to blue and red colors, but more sensitive to green and grey colors. In the table above, the total daylight reflectance of the most saturated blue color in the sRGB color space is only with 7.2% of total daylight reflectance.

On-site glass optical & thermal property monitoring system

A measurement system was integrated by OTM for on-site glass optical & thermal property monitoring. The system uses off-shelf sensors and wireless data loggers and can be easily deployed for 24×7 glass performance monitoring projects.

Measurement principle

The system consists of two indoor measurement systems (reference room vs. test room) and one outdoor measurement system. Shown below are the system schematics.

Instruments in an indoor measurement system (in total two sets, one for the reference room and one for the test room)
Instruments in the outdoor measurement system (one set only)

The following quantities are measured:

  • Indoor side (4 quantities): daylight illuminance [lux], solar irradiance [W/m2], air temperature [°C] and glass surface temperature [°C]
  • Outdoor side (3 quantities): daylight illuminance [lux], solar irradiance [W/m2], air temperature [°C]

What cannot be measured?

The system is for glass optical & thermal performance monitoring only. The results are qualitatively correlated to glass visible light transmittance and solar energy transmittance.

However, it is not possible to quantitatively evaluate glass optical & thermal properties rated under standard conditions (e.g. visible light transmittance, U-value, and shading coefficient) from the monitoring results. If such quantities are required, please consider our laboratory glass testing service.


The following instruments from Delta Ohm were used in the monitoring system:

Necessary mounting accessories were included. The instruments can be conveniently installed on-site in less than 1 hour. Shown below is a photo of the outdoor side instruments in the demo installation.

Outdoor side instruments in the demo installation


Shown below is a screen capture of some monitoring results (in the wireless data logger control software).

An in-house software can be used to automate the data processing part, as shown below.

Shown below are some sample results:

Material yellowness index and whiteness index testing

We are able to measure material yellowness index and whiteness index according to ASTM E313-20. The measurement part is the same as our usual material color measurement.

The spectral reflectance data in the 380 nm – 780 nm range are used in the calculation. Our in-house software Color@OTM has been upgraded for automated calculation.

As the spectral range is included in the daylight reflectance test and solar reflectance index (SRI) test, it is possible to re-use the spectral data collected in the two tests for yellowness index and whiteness index calculation, without re-testing.

Far infra-red radiation measurement with pyrgeometer and wireless data logger

The system below was wired and configured by OTM for far infra-red radiation measurement, with the following components:

  • Delta Ohm LPPIRG01S pyrgeometer with MODBUS-RTU output
  • Delta Ohm HD35EDW-MB wireless data logger supporting MODBUS-RTU output

Listed below are the key specifications:

  • Spectral range: 5.5 μm – 45 μm
  • Viewing angle: 160°
  • Protection degree: IP67, for outdoor use
  • Wireless connection between data logger and base unit
Top view
Side view
Software interface