7 engineering guides
Engineering guides for choosing instruments
Straight answers to the selection questions we hear from consultants and plant engineers, with comparison tables and checklists for your next project.
- 01
Magnehelic-type vs digital DP gauges for cleanrooms
For any cleanroom pressure difference your risk assessment calls critical, use a digital differential pressure transmitter or room monitor wired to a…
9 min read - 02
BTU meters for chilled water: selection and installation
A BTU meter (thermal energy meter) combines a flow sensor, a matched pair of temperature sensors and a calculator that integrates flow × temperature…
9 min read - 03
Electromagnetic vs ultrasonic flow meter: which to use
Choose an electromagnetic flowmeter when the liquid is conductive, the pipe can be cut and will always run full, and you want the best installed…
9 min read - 04
How to select a pressure gauge: range, accuracy, fittings
Choose the range so that normal operating pressure sits in the middle third of the scale and the maximum working pressure stays below about 75% of…
9 min read - 05
CO2 sensors for demand-controlled ventilation and IAQ
For demand-controlled ventilation, use an NDIR CO2 sensor in each densely and variably occupied zone, mounted in the breathing zone and wired to the…
9 min read - 06
RTD vs thermocouple: how to choose a temperature sensor
Choose a Pt100 RTD for most measurements from about −200 °C to 600 °C where accuracy and long-term stability matter, such as HVAC water, process…
9 min read - 07
Radar vs ultrasonic level transmitter: which to choose
Use an ultrasonic level transmitter for water, effluent and chemical tanks at atmospheric pressure, and for open-channel flow, where the air space is…
8 min read