Safety Instructions
1. Prior to installation or removal:
• Depressurize and vent system
• Drain below sensor level
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
6. Dispose of properly; DO NOT INCINERATE!
Signet 2250 Hydrostatic Level Sensor
1. Description
2. Specifi cations
The Signet 2250 Hydrostatic Level Sensor uses a gauge pressure sensor to calculate the level of fl uid in a tank. Gauge pressure
sensors measure the difference in pressure between the process on one side of a diaphragm and the atmospheric pressure on the
opposite side of the diaphragm. A tiny capillary tube running from inside the sensor body and up the length of
the cable provides the reference to atmospheric pressure.
Hydrostatic level measurement can be a simple and practical solution to those applications where the fl uid
temperature is stable and constant.
IMPORTANT! This method of level measurement is not recommended if the fl uid is subject to
temperature variations or any other variable that causes the density of the fl uid to change.
The 2250 Hydrostatic Level Sensor has excellent chemical compatibility. The wetted materials are PVDF,
Ceramic and FPM.
Several different hardware mounting kits are available to accommodate every installation requirement.
3-2250.090
Rev. A 12/06
English
*3-2250.090*
English
Dimensions
½ in. (ANSI) or
25 mm (ISO)
Solvent Socket,
PVC-U
34 mm
(1.32 in)
115 mm
(4.55 in)
53 mm
(2.09 in)
General
Compatibility:
Signet 8250-2 and -3 Level Transmitters
Signet
8900
Multi-Parameter
Controller
Standards and Approvals:
• CE
•
Manufactured under ISO 9001:2000 for Quality and
ISO 14001:2004 for Environmental Management
Wetted Material
• Sensor
housing:
PVDF
• Union
nut/bushing:
PVC-U
• Diaphragm:
Ceramic
•
Diaphragm seal:
FPM (optional EPDM)
Cable type:
22 AWG, 3 cocapillary tube
Cable length:
10 m (32.8 ft.) supplied
max. extension 120 m (400 ft.)
Operating Temperature:
15˚C to 85˚C (5˚F to 185˚F)
Storage Temperature:
-20˚C to 100˚C (-4˚F to 212˚F)
Operating Pressure:
-XU: 0 to 0.7 bar (0 to 10 psig)
-XL: 0 to 3.4 bar (0 to 50 psig)
Electrical
Digital (S
3
L) Output:
•
Format:
Serial ASCII, TTL level 9600 bps.
•
Accuracy:
±1% of full scale (±0.001 psi)
•
Power:
5 VDC nominal, 1.5 mA max. current
(5 VDC min, 6.5 VDC max)
•
Reverse polarity and short circuit protected
4 to 20 mA Output:
• Factory
span:
• -XU: 0 to 0.7 bar (0-10 psig) = 0-7 m (23 ft.) of water
• -XL: 0 to 3.4 bar (0-50 psig) = 0-34 m (115.5 ft.) of water
• Accuracy:
±32
µA
• Resolution:
<5
µA
• Response
Time:
<100ms
•
Loop Power Required: 12 to 24 VDC nominal, 22.1 mA max
(10.8 VDC min. to 26.4 VDC max.)
•
Max. Loop Impedance:
100Ω
@
12V
325Ω
@
18V
600Ω
@
24V