SmartLine
Technical Information
STD700 SmartLine Differential Pressure
Specification 34-ST-03-121, Jan 2021
Introduction
Part of the SmartLine® family of products, the STD700 models are suitable for monitoring, control and data acquisition featuring piezoresistive sensor technology. By combining pressure sensing with on chip temperature compensation capabilities STD700 offers high accuracy,
stability and performance over a wide range of application pressures and temperatures. The SmartLine family is also fully tested and compliant with Experion® PKS providing the highest level of compatibility assurance and integration capabilities. SmartLine easily meets the most demanding application needs for pressure measurement applications.
Best in Class Features:
o Accuracies up to 0.05% of span
o Stability up to 0.020% of URL per year for 10 years
o Automatic static pressure & temperature compensation o Rangeability up to 100:1
o Response times as fast as 100ms
o Easy to use and intuitive display capabilities
oIntuitive External Zero, Span and configuration capability
o Comprehensive on-board diagnostic capabilities
oIntegral Dual Seal design for highest safety based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0
o World class overpressure protection
o Full compliance to SIL 2/3 requirements. o Modular design characteristics
o Available with additional 4-year warranty
Communications/Output Options:
o HART ® (version 7.0)
Figure 1 – STD725/735/775 Differential Pressure Transmitters feature field-proven piezoresistive sensor technology
Span & Range Limits:
Model |
URL |
LRL |
Min Span |
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inH2O |
inH2O |
inH2O |
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(mbar) |
(mbar) |
(mbar) |
STD725 |
400 (1000) |
-400 (1000) |
4 (10) |
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Model |
psi (bar) |
psi (bar) |
psi (bar) |
STD735 |
100 (7.0) |
-100 (-7.0) |
1 (0.07) |
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STD775 |
3000 (210) |
-100 (-7.0) |
30 (2.1) |
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STD700 Smart Pressure Transmitter |
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Description
The SmartLine family pressure transmitters are designed around a high performance piezo-resistive sensor. This one sensor actually integrates multiple sensors linking process pressure measurement with on-board static pressure (DP Models) and temperature compensation measurements.
Indication/Display Option
Standard LCD Display Features
o Modular (may be added or removed in the field) o Supports HART protocol variant
o 0, 90,180, & 270 degree position adjustments
oConfigurable (HART only) and standard (Pa, KPa, MPa, KGcm2, Torr, ATM, inH2O, mH2O, bar, mbar, inHG, FTH2O, mmH2O, mm HG, & psi) measurement units.
o Supports Flow engineering units
o 2 Lines 6 digits PV (9.95H x 4.20W mm) 8 Characters o Square root output indication (√)
o Write protect Indication
oBuilt in Basic Device Configuration through Internal or External Buttons – Range/Engineering Unit/Loop Test /Loop Calibration/Zero /Span Setting
o Multiple language capability (EN, RU)
Diagnostics
SmartLine transmitters all offer digitally accessible diagnostics which aid in providing advanced warning of possible failure events minimizing unplanned shutdowns, providing lower overall operational costs
System Integration
oSmartLine communications protocols all meet the most current published standards for HART.
oAll ST 700 units are Experion tested to provide the highest level of compatibility assurance
Configuration Tools
External Two Button Configuration Option
Suitable for all electrical and environmental requirements, SmartLine offers the ability to configure the transmitter and display, for all basic parameters, via two externally accessible buttons when a display option is
selected. Zero/span capabilities are also optionally available via two external buttons with or without selection of the display option.
Internal Two Button Configuration Option
The Standard display has two buttons that can be used for Basic configuration such as re ranging, PV Engineering unit setting, Zero/Span settings, Loop testing and calibration functions.
Hand Held Configuration
SmartLine transmitters feature two-way communication and configuration capability between the operator and the transmitter. All Honeywell transmitters are designed and tested for compliance with the offered communication protocols and are designed to operate with any Standards compliant handheld configuration device.
Modular Design
To help contain maintenance & inventory costs, all ST 700 transmitters are modular in design supporting the user’s ability to replace meter bodies, standard displays or electronic modules without affecting overall performance. Each meter body is uniquely characterized to provide intolerance performance over a wide range of application variations in temperature and pressure.
Modular Features
Meter body replacement
Add or remove standard displays
Add or remove lightning protection (terminal connection)
With no performance effects, Honeywell’s unique modularity results in lower inventory needs and lower overall operating costs.
STD700 Smart Pressure Transmitter |
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Performance Specifications
Reference Accuracy (conformance to +/-3 Sigma)
Table 1
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Maximum |
Stability |
Reference |
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Accuracy1,2 |
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Model |
URL |
LRL |
Min Span |
Turndown |
(% URL/Year |
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Ratio |
for 10 years) |
(% Span) |
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Standard |
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STD725 |
400 in H2O (1000 mbar) |
-400 in H2O (-1000 mbar) |
4 in H2O (10 mbar) |
100:1 |
0.020 |
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0.05 |
STD735 |
100 psi (7.0 bar) |
-100 psi (-7.0 bar) |
1 psi (0.07 bar) |
100:1 |
0.020 |
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STD775 |
3000 psi (210 bar) |
-100 psi (-7.0 bar) |
30 psi (2.1bar) |
100:1 |
0.020 |
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Zero and span may be set anywhere within the listed (URL/LRL) range limits
Accuracy, Temperature and Static Pressure Effects: (Conformance to +/-3)
Table 2
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Combined Zero & |
Combined Zero & |
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Accuracy1,2 |
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Span temperature |
Span Static Line |
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Effect |
Pressure Effect |
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(% of Span) |
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(% Span / 28oC |
(% Span / 1000psi) |
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(50oF)) |
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Reference |
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C |
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F |
G |
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Model |
URL |
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A |
B |
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(see URL |
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E |
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Turndown |
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units) |
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<![if ! IE]> <![endif]>Standard Accuracy |
STD725 |
400 in H2O |
16:1 |
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25 (62,5) |
0.050 |
0.025 |
0.100 |
0.020 |
(1000 mbar) |
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STD735 |
100 psi (7.0 bar) |
4:1 |
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0.005 |
0.045 |
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25 (1.75) |
0.070 |
0.015 |
0.100 |
0.020 |
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STD775 |
3000 psi (210 bar) |
10:1 |
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300 (21) |
0.070 |
0.015 |
0.100 |
0.020 |
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Turn Down Effect |
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Temp Effect |
Static Effect |
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Total Performance (% of Span):
Total Performance = +/- √(Accuracy)2 + (Temp Effect)2+ (Static Line Pressure Effect)2
Total Performance Examples: (standard accuracy, 5:1 Turndown, up to 50 oF shift & up to 1000 psi Static Pressure)
STD725 @ 80 inH2O: 0.270% of span STD735 @ 20 psi: 0.255 % of span STD775 @ 600 psi: 0.252 % of span
Typical Calibration Frequency:
Calibration verification is recommended every two (2) years
Notes:
1.Terminal Based Accuracy – Includes combined effects of linearity, hysteresis and repeatability. Analog output adds 0.006% of span
2.For zero based spans and reference conditions of: 25oC (77oF), 0 psig static pressure, 10 to 55% RH and 316SS barrier diaphragm.
4 STD700 Smart Pressure Transmitter
Operating Conditions – All Models
Parameter |
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Reference |
Rated Condition |
Operative Limits |
Transportation and |
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Condition |
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Storage |
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C |
F |
C |
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F |
C |
F |
C |
F |
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Ambient Temperature1 |
25±1 |
77±2 |
-40 to 85 |
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-40 to 185 |
-40 to 85 |
-40 to 185 |
-55 to 120 |
-67 to 248 |
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Meter Body Temperature |
25±1 |
77±2 |
-40 to 110 |
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-40 to 230 |
-40 to 125 |
-40 to 257 |
-55 to 120 |
-67 to 248 |
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Humidity |
%RH |
10 to 55 |
0 to 100 |
0 to 100 |
0 to 100 |
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Vac. Region – Min. Pressure |
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mmHg absolute |
Atmospheric |
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25 |
2 (short term ) 2 |
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inH2O absolute |
Atmospheric |
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13 |
1 (short term ) 2 |
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Supply Voltage |
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10.8 to 42.4 Vdc at terminals (IS versions limited to 30 Vdc) |
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Load Resistance |
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0 to 1,440 ohms (as shown in Figure 2) |
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Maximum Allowable |
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Working Pressure (MAWP)3,4 |
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(ST 700 products are rated to |
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Maximum Allowable Working |
4,500 psi (310 bar) |
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Pressure. MAWP depends on |
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Approval Agency and |
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transmitter materials of |
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construction.) |
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1LCD Display operating temperature -20 C to +70 C Storage temperature -30 C to 80 C.
2Short term equals 2 hours at 70 C (158 F)
3MAWP applies for temperatures -40 to 125 C. Static Pressure Limit is de-rated to 3,000 psi for -26 C to -40 C. for all models. Use of
graphite o-rings de-rates transmitter to 3,625 psi. Use of 1/2:” process adaptors with graphite o |
-rings de-rates transmitter to 3,000 psi. |
4Consult factory for MAWP of ST 700 transmitters with CRN approval.
5Silicone minimum temperature rating is -40 C (-40 F). CTFE minimum temperature rating is -30 C (-22 F).
Figure 2 - Supply voltage and loop resistance chart & calculations
STD700 Smart Pressure Transmitter |
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Performance Under Rated Conditions – All Models
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Parameter |
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Description |
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Analog Output |
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Two-wire, 4 to 20 mA |
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Digital Communications: |
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HART 7 protocol |
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HART Output Failure Modes |
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Honeywell Standard: |
NAMUR NE 43 |
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Compliance: |
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Normal Limits: |
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3.8 – 20.8 mA |
3.8 – 20.5 |
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mA |
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Failure Mode: |
≤ 3.6 mA and ≥ 21.0 mA |
≤ 3.6 mA and ≥ |
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21.0 mA |
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Supply Voltage Effect |
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0.005% span per volt. |
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Transmitter Turn on Time |
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(includes power up & test |
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2.5 sec. |
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algorithms) |
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Response Time |
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100mS |
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(delay + time constant) |
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Damping Time Constant |
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Adjustable from 0 to 32 seconds in 0.1 increments. Default: 0.50 seconds |
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Vibration Effect |
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Less than +/- 0.1% of URL w/o damping |
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Per IEC60770-1 field or pipeline, high vibration level (10-2000Hz: 0.21 |
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displacement/3g max acceleration) |
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Electromagnetic Compatibility |
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IEC 61326-3-1 |
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Lightning Protection Option |
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Leakage Current: 10uA max @ 42.4VDC 93C |
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Impulse rating: |
8/20uS |
5000A (>10 strikes) |
10000A (1 strike min.) |
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10/1000uS 200A (> 300 strikes) |
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Materials Specifications (see model selection guide for availability/restrictions with various models) |
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Parameter |
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Description |
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Barrier Diaphragms Material |
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316L SS, Hastelloy® C-2762 |
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Process Head Material |
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316 SS4, Carbon Steel (Zinc-plated) 5, Hastelloy® C-2766 |
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Vent/Drain Valves & Plugs 1 |
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316 SS4, Hastelloy® C-2762 |
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Head Gaskets |
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Glass-filled PTFE standard. Viton® and graphite are optional. |
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Meter Body Bolting |
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Carbon Steel (Zinc plated) standard. Options include 316 SS, NACE A286 SS bolts |
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and Super Duplex. |
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Optional Adapter Flange and |
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Adapter Flange materials include 316 SS, Hastelloy® C-276 and Super-Duplex. Bolt |
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material for flanges is dependent on process head bolts material chosen. Standard |
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Bolts |
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adaptor seal material is glass-filled PTFE. Viton and graphite are optional. |
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Mounting Bracket |
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2” Pipe, Carbon Steel (Zinc-plated), 304 Stainless Steel or 316 Stainless Steel |
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Fill Fluid |
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Silicone 200 , CTFE |
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Electronic Housing |
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Pure Polyester Powder Coated Low Copper (<0.4%)-Aluminum. Meets NEMA 4X, |
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IP66, & IP67. All stainless steel housing is optional. |
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Mounting |
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Can be mounted in virtually any position using the standard mounting bracket. Bracket |
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is designed to mount on 2-inch (50 mm) vertical or horizontal pipe. See Figure 3. |
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Process Connections |
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1/4- NPT or 1/2- NPT with adapter (meets DIN requirements) |
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Wiring |
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Accepts up to 16 AWG (1.5 mm diameter). |
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Dimensions |
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See Figure 3. |
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Net Weight |
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8.3 pounds (3.8 Kg) with Aluminum Housing. |
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1Vent/Drains are sealed with Teflon®
2Hastelloy® C-276 or UNS N10276
4Supplied as 316 SS or as Grade CF8M, the casting equivalent of 316 SS.
5Carbon Steel heads are zinc-plated and not recommended for water service due to hydrogen migration. For that service, use 316 stainless steel wetted Process Heads.
6Hastelloy C-276 or UNS N10276. Supplied as indicated or as Grade CW12MW, the casting equivalent of Hastelloy C-276