SmartLine STG700 Series STG74L-EIH000-1-C-DHC transmitters

1. General description

l The Honeywell SmartLine STG700 Series STG74L-EIH000-1-C-DHC is a gauge pressure transmitter built for mid-range applications. It measures pressures up to about 500 psi, making it a good fit for pumps, compressors, pipelines, and utility systems.

l The “L” in its name means it uses an inline connection design. This layout makes installation easier, especially in tight spaces. The transmitter’s sensor delivers accurate and stable readings, even when the process environment changes.

l You can replace its electronics and other parts in the field. This design helps you cut downtime and lower maintenance costs. The transmitter also supports digital communication, enabling smooth connection with modern control systems.

l Honeywell designed the SmartLine series to respond quickly and maintain accuracy over time. Its strong housing and safety approvals allow you to use it in demanding industries. These include oil and gas, chemicals, power, and water treatment.

2. The specifications:

l This model measures pressures up to about 500 psi (≈35 bar). You can use it in pumps, compressors, pipelines, and other medium-pressure systems.

l The transmitter sends a 4–20 mA signal and also supports HART digital communication. This makes it easy to connect with most modern control systems.

l It delivers accuracy around 0.055% of the span. Over time, it stays reliable with a stability of about 0.02% of URL per year for up to ten years.

l The unit reacts quickly. It can update readings in about 100 milliseconds, which helps in fast-changing processes.

l You can scale the transmitter over a wide span, with a rangeability up to 100:1.

l It works in ambient temperatures from about –20°C to +70°C. The process temperature limit depends on the fill fluid and materials.

l Honeywell builds the body from 316L stainless steel. The inline (“L”) design comes with ½-inch NPT female connections for easy mounting.

l The housing is rugged and meets IP66/IP67 ratings so that it can resist dust and water in outdoor use.

l You can order versions with explosion-proof, intrinsically safe, or non-incendive certifications. These options make it suitable for hazardous areas.

3. Common Honeywell SmartLine STG700 Models and unique features:

3.1 stg735 (0–50 psi) gauge :

A low-pressure gauge transmitter is suitable for general utility and process monitoring.

3.2 stg740 (0–500 psi) gauge:

A mid-range option, often used in plant utilities and pipelines.

3.3 stg74s gauge (0–500 psi, square flange):

Same range as STG740 but with a different mounting style.

3.4 stg74l gauge (0–500 psi, inline) :

The inline body version makes installation easier in tight spots.

3.5 stg77s high pressure transmitter (up to 3,000 psi, square flange):

Designed for higher-pressure applications like hydraulics.

3.6 stg77l heavy duty gauge (up to 3,000 psi, inline):

Same pressure rating as STG77S but in a straight-through body.

3.7 stg79l heavy-duty transmitter gauge (up to 10,000 psi, inline) :

Heavy-duty model for extremely high-pressure systems.

3.8 stg79s high-pressure gauge (up to 10,000 psi, square flange):

High-pressure version with flange mounting.

3.9 STG735-E1GC4A :

A popular factory-shipped build of the 0–50 psi model with dual head and standard electronics.

3.10 STG79L-E1G000 :

A frequently stocked build of the 10,000 psi inline model with standard options.

4. Application occasions:

l In the oil and gas industry, you can use it to check pressure in pipelines, pump stations, and separators. The fast response time enables operators to see changes quickly and react before problems escalate.

l In chemical plants, the transmitter tracks pressure in reactors, tanks, and process lines. Its stainless-steel body stands up to harsh and sometimes corrosive conditions.

l In the power sector, engineers use it on feedwater lines, boilers, and cooling systems. Accurate readings keep systems running efficiently and prevent sudden shutdowns.

l In water and wastewater treatment, the transmitter supports pumping stations and filtration systems. Reliable feedback helps operators move water smoothly and reduce wasted energy.

l The STG74L-EIH000-1-C-DHC also works well with modern control systems. Its HART digital output lets maintenance crews set it up, adjust it, and troubleshoot from the control room. That reduces downtime and lowers labor costs.

For some other models or parts you are interested in, please refer to the following:

900A16-0103 Honeywell Analog Input 16-channel card

900R12-0300 Honeywell Combustion 12-Slot Rack

 Honeywell STD810 Differential Pressure Transmitter

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