3
Signet 2551 Display Magmeter
Power Requirements
4 to 20 mA ..................... 21.6 to 26.4 VDC, 22.1 mA max.
400 mV p-p maximum ripple voltage
Frequency......................5 to 26.4 VDC, 15 mA max.
Digital.............................5 to 6.5 VDC, 15 mA max.
Auxiliary ......................... 9 to 24 VDC, 0.4A max
(only required for units with relays)
Reverse polarity and short circuit protected
Current output (4 to 20 mA)
Max Loop Resistance ....300
Ω
Loop Accuracy ...............32
μ
A max. error (25 °C @ 24 VDC)
Temp. drift ......................± 1
μ
A per °C max.
Power supply rejection ...± 1
μ
A per V
Isolation: ....................... Low voltage < 48 VAC/DC from
electrodes and aux power
Maximum cable .............300 m (1000 ft)
Error condition ...............22.1 mA
Frequency output
Output modes ................Freq, Freq÷10, or Mirror Relay 1
Max. Pullup Voltage .......30 VDC
Max. Current Sink ..........50 mA, current limited
Maximum cable .............300 m (1000 ft)
Reverse Polarity Protected to -40 V
Digital (S
3
L) Output
Serial ASCII, TTL level 9600 bps
Compatible with Signet 8900 and 9900
Maximum cable ...... Application dependent (See 8900 manual)
Relay Speci
fi
cations
Relay 1 and 2 Type ........Mechanical SPDT
Rating ............................ 5 A @ 30 VDC max.,
5 A @ 250 VAC max.
Relay 3 Type ..................Solid State
Rating ............................50 mA @ 30 VDC, 50 mA @ 42 VAC
Hysteresis ......................Adjustable, plus timer delay
Trigger Delay .................Adjustable (0 to 9999.9 sec.)
Relay Modes.................. Off, Low, High, Window, and
Proportional Pulse
Relay Source .................Flow Rate, Resettable Totalizer
Error Condition ..............Selectable; Fail Open or Fail Closed
Display
Characters .....................2 x 16
Contrast .........................User-set in four levels
Backlighting ................... Requires external 9-24 VDC,
0.4 mA max. (only on relay versions)
Environmental Requirements
Enclosure ......................NEMA 4X / IP65 (with cap installed)
Case ..............................PBT
Display window ..............Polyamide
Storage Temperature .....-20 °C to 70 °C (-4 °F to 158 °F)
Relative Humidity...........0 to 95% (non-condensing)
Operating Temperature:
Ambient ......................-10 °C to 70 °C (14 °F to 158 °F)
Media .........................0 °C to 85 °C (32 °F to 185 °F)
Operating pressure:
Maximum
...................
10.3 bar @ 25 °C (150 psi @ 77 °F)
1.4 bar @ 85 °C (20 psi @ 185 °F)
Speci
fi
cations
General
Pipe size range ..............DN15 to DN900 (½ in. to 36 in.)
Flow Range ...................Minimum: 0.05 ms (0.15 ft/s)
(Bi-directional) ...............Maximum: 10 ms (33 ft/s)
Linearity ......................... ±1% of r0.01 ms (0.033 ft/s)
Repeatability ..................±0.5% of reading @ 25 °C (77 °F)
Minimum Conductivity ...20
μ
S/cm
Wetted Materials
Sensor body and Electrodes and Grounding ring:
-P0, -P1, -P2 ..............Polypropylene and 316L SS
-T0, -T1, -T2 ...............PVDF and Titanium
-V0, -V1,-V2 ...............PVDF and Hastelloy-C
O-rings
.......................
FPM (standard) EPDM, FFPM
(optional)
The user is responsible for determining
the chemical suitability of these materials
for a speci
fi
c application.
Standards and Approvals
• CE
• UL/CUL (for display versions with relays)
• NSF (3-2551-P versions only)
• RoHS
compliant
China RoHS (visit gfsignet.com for details)
•
Manufactured under ISO 9001 for Quality, ISO 14001
for Environmental Management and OHSAS 18001 for
Occupational Health and Safety.
Declaration of Conformity according to FCC Part 15
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and,
(2) This device must accept any interference received,
including interference that may cause undesired operation.
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
.7
1.4
2.1
2.8
3.4
4.1
4.8
5.5
6.2
6.9
7.6
8.3
9.0
9.7
10.3
11.0
11.7
12.4
(bar)
(psi)
0
-20
0
20
40
60
80
100
120
°F
°C
-4
32
68
104
140
176
212
248
