Temperature instruments(filled system) specification

General
1. Tag No.(ตั้งชื่อ) Service(อยู่ pipeline/equipment อะไร)
2. Function : Record/Indicate/Control/Trans/Blind/Other ระบุการใช้งาน
3. Case(โครงตัวถัง): MFR STD/Other(ระบุ)
4. Mounting(การคิดตั้ง):Flush/Surface/Yoke(stanchion 2")/Other
5. Enclosure class :General purpose/Weather proof/
Explosion proof for_____/Intrinsically safe for______
6. Power supply : 220 Vac/120 vAc/24 Vdc/Other________
7. Chart: Strip/Roll/Fold/Circular/Time marks
8. Chart Drive(synchronous motor operating) : Speed MFR STD/ Other ระบุ
9. Scale: Type(SEGMENTAL, VERTICAL, HORIZONTAL, DIAL (CIRCULAR))
Range : ระบุย่านการวัด
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XMTR
10.Transmitter output : 4-20mA/Other_________ Range, setting : Screw adjust

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Controller
11. Control Modes : P=Prop(Gain), I=Integral(Auto reset), D=Derivative(Rate)
(ระบุถ้าสั่ง ) P/PI/PD/PID/Other_______
- A proportional(P=Prop) controller decreases the average power
supplied to the heater as the temperature approaches setpoint.
This has the effect of slowing down the heater so that
it will not overshoot the setpoint,
เป็นค่าการขยายมากน้อยเพื่อเร่งให้เข้าสู่ setpoint
ค่าจะแกว่งเนื่องจากถึง setpoint จะหยุดการสั่งงาน จะสั่่งให้ทํางานอีกครั้งเมื่อหลุด setpoint
-I=Integral(Auto reset) action gives the controller a large gain
at low frequencies that results in eliminating offset
and "beating down" load disturbances.
The controller phase starts out at –90 degrees and increases to
near 0 degrees at the break frequency.
This additional phase lag is what you give up by adding integral action.
Derivative action adds phase lead and is used to compensate for
the lag introduced by integral action.
ทําให้การควบคุมแบบ Prop มีความนิ่งขึ้น ลดช่องว่าง ของ process variable กับ set point
- D=Derivative(Rate)With derivative action, the controller output is proportional to
the rate of change of the measurement or error.
The controller output is calculated by the rate of change
of the measurement with time.
Output จะออกมาตาม Rate of change ของ Process variable กับ set point

12. Action: On measure output : Increase/Decrease
(เลือกแบบ output, input เพิ่ม Output เพิ่มตามหรือ ลดลง)
13. Auto/Manual switch : MFR STD/None/Other
ให้มี Auto/Manual switch หรือไม่
14. Set point Adjustment : Manual/Remote/External/Other_____
15. Manual Reg. : MFR STD/None/Other
16. Output : 4-20mA/Other(ต่องการต่อไปดูที่อื่นหรือไม่ ถ้ามี เช็ค ว่าจะสื่อสารแบบไหน(rs-232,rs-485 เป็นต้น)
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Element
17. fill : SAMA Class____________ Compensation___________
Class Temperature range Response
Class l -125 F to + 600 F Slowest
Filled thermal systems can be of the following SAMA classifications:
SAMA Class I, Liquid Filled SystemsSAMA Class I systems are completely
liquid filled. The fill fluid is usually a hydro-carbon such as xylene
or ethylbenzene. The fill fluid should remain in the liquid
phase over the entire temperature range.
The vapor pressure of the fill fluid should be below the maximum pressure
of the filled thermal system at maximum temperature to prevent bubbles.
The fill fluid should never freeze or solidify because this
would change the calibration. Class I systems are subdivided as follows
:SAMA Class IA systems are fully compensated for ambient temperature changes.
This is accomplished with a second bourdon tube and capillary.
:Class IB systems are case compensated for ambient temperature changes at
the instrument case. This is usually accomplished with a bimetallic
mechanism in the case
Class IA: Liquid filled, uniform scale, fully compensated.
Class IB: Liquid filled, uniform scale, case compensated only.

18. Process data :Temp. Min/Normal/Max
19. Pipe pressure class : 150 psi/300 psi/600 psi/Other____
(สําคัญตอนสั่ง thermowell แบบ flange)
20. Range :Fixed/Adjustable set at field
Overrange protection to :30 % of Max. Temp/ Other(ระบุ)
21. Bulb :Material: 316 ss,length : Fit to bottom of well
Size: MFR. STD. Diameter: MFR. STD.
Connection: 1" MNPT or MFR.STD. /w Adjustable union lock
22. Capillary : MFR STD/ Length ระบุ /Material: 316 ss/Armor: 316 ss
23. Well: Materail: 316 ss,
Insertion: 2/3 of Pipe I.D.(If pipe less than 4" then Extend to 4")
Lag Ext: MFR. STD.,Process Connection: 2" Flange is prefered or MFR. STD.
Contruction : Drilled/Built-up/Other________
Connection with Bulb : 1" FNPT
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Alarm swithces
24. Number of alarm: 1-2, Form/: SPDT, rating: 220 Vac, 5A
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Options
25. Sup.-gage/Output gage
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26. MFR & Model:ระบุหลังจากสรุปยี่ห้อที่จะซื้อ
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27. Certificate: Yes Cerficate of conformity, alarm set report(if required)