34-ST-03-57 Page 7

 

1440

 

 

 

 

 

 

 

 

1200

 

 

 

 

 

 

 

Loop

800

 

 

 

 

 

 

 

Resistance

 

 

 

 

 

 

 

 

(ohms)

650

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

450

 

 

 

 

 

 

 

 

250

 

 

 

 

 

 

 

 

0

10.8

16.28

20.63

25

28.3

37.0

42.4

Operating Voltage (Vdc)

Note: A minimum of 250 ohms of loop resistance is necessary to support communications.

Loop resistance equals barrier resistance plus wire resistance plus receiver resistance.

= Operating Area

Figure 14—Supply voltage and loop resistance chart

Performance Under Rated Conditions * - Model STR93D (0 to 100 psi/7 bar)

Parameter

Upper Range Limit

psi

 

bar

Minimum Span

psi

 

bar

Turndown Ratio

 

Zero Elevation and Suppression

Accuracy (Reference – Includes combined effects of linearity, hysteresis, and repeatability)

Accuracy includes residual error after averaging successive readings.

For FOUNDATION Fieldbus use Digital Mode specifications. For HART use Analog Mode specifications.

Combined Zero and Span Temperature Effect per 28°C (50°F) **

Description

100 (Transmitter URL or maximum seal pressure rating, whichever is lower.) 7

0.9

0.063

110 to 1

No limit except minimum span within ±100% URL.

In Analog Mode: ±0.20% of calibrated span or upper range value (URV), whichever is greater, terminal based.

For URV below reference point (50 inH2O), accuracy equals:

 

50 inH2O

 

125 mbar

±0.10 + 0.10

 

or ±0.10 + 0.10 (

 

) in % of span

span inH2O

span mbar

In Digital Mode: ±0.175% of calibrated span or upper range value (URV), whichever is greater, terminal based.

For URV below reference point (50 inH2O), accuracy equals:

 

 

±0.075 + 0.10

50 inH2O

or ±0.075 + 0.10 (

125 mbar

 

) in % of span

 

span inH2O

span mbar

In Analog Mode: ±1.5% of span.

 

 

 

 

 

For URV below reference point (200 inH2O), effect equals:

 

 

 

200 in H2O

 

500 mbar

±0.30 + 1.2

 

 

 

or ±0.30 + 1.2

span mbar

In % span

 

span in H2O

 

 

 

 

 

 

 

 

In Digital Mode: ±1.475% of span.

 

 

 

 

 

For URV below reference point (200 inH2O), effect equals:

 

 

 

200 in H2O

 

500 mbar

±0.275 + 1.2

 

 

or ±0.275 + 1.2

span mbar

In % span

span in H2O

 

 

 

 

 

 

 

 

*Performance specifications are based on reference conditions of 25°C (77°F), zero (0) static pressure, 10 to 55% RH, and 316L Stainless Steel barrier diaphragm.

**Specification applies to transmitters with 2 seals only. Apply 1.5 times factor to temperature effect for capillary lengths greater than 10 feet or for 2-inch sanitary seals.

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Honeywell STR94G, STR93D manual Parameter, Description, Bar, Mbar, ±0.275 +

STR94G, STR93D specifications

The Honeywell STR93D and STR94G are advanced temperature controllers designed for precision temperature management in a variety of applications, from industrial processes to HVAC systems. These intelligent devices are engineered to enhance efficiency, reliability, and user flexibility, catering to both simple and complex control scenarios.

The STR93D is characterized by its dual-channel capability, making it ideal for processes requiring simultaneous temperature monitoring and control. Its robust design ensures stable performance even in demanding environments. The controller features a user-friendly interface that includes a large, backlit display, allowing operators to easily navigate through menus and settings. The intuitive design simplifies the setup process, reducing installation time and minimizing user error.

On the other hand, the STR94G takes automation a step further with its advanced features and connectivity options. This model is equipped with a comprehensive set of control algorithms, including PID, on-off, and fuzzy logic controls, ensuring precise temperature regulation. The STR94G also supports multiple input types, such as thermocouples and RTDs, providing versatility across various applications.

Both models incorporate Honeywell's proprietary Smart Control technology, which optimizes energy consumption and enhances operational efficiency. This technology not only ensures accurate temperature management but also contributes to reduced operational costs by minimizing energy waste. Additionally, the controllers support communication protocols such as Modbus and BACnet, facilitating easy integration into existing systems and enabling remote monitoring capabilities.

Both controllers are built with durability in mind, featuring a rugged housing that protects against environmental factors, including dust and moisture. This makes them suitable for use in harsh industrial settings as well as in less demanding environments. Their adaptability and advanced technology provide users with solutions that not only meet but exceed industry standards.

In summary, the Honeywell STR93D and STR94G are exemplary temperature controllers that stand out in their field. They combine advanced control features, robust design, and exceptional connectivity, making them suitable for a wide range of applications. Whether for industrial use or commercial HVAC installations, these controllers deliver reliability and efficiency, setting a benchmark in temperature control solutions.