ST857 Retraction DynaProbe pH and Redox Sensors

The ST857 is a rugged, sealed, replacement sensor designed for insertion / retraction applications. The Patented solid state reference cell features the unique IonTrap^™ design for extended service life in the most severe applications. The body, with an integral bulb guard and anti-blowout restraint, is moulded from chemically resistant Kynar(PVDF) and the reference junction is porous Teflon. Built-in temperature compensators are available. Sensor also available in ORP (Redox) version. Also fits TBI / Bailey Model TB557 «Hot Tap» sensor assemblies.

Specification

pH Range: 0-14 pH

ORP Range: ± 5000 mV

Temp Range: 0 -120º C

Max Pressure/Temp: 100 psig at 90º C

Reference: Ag-AgCl

Wetted Materials: Ryton, Teflon, Glass and Viton O-rings

Standard cable length: 7 Feet

Housing Model SA857 must be ordered separately

Please use this information to build your part number. If you need any assistance please call us on +44 (0) 1525 862 518.
Part No.	1	2	3	4	–	5	6	7	8	9
ST-857	__	__	__	__	–	__	__	__	__	__

1 — Liquid Junction

[W] Recessed Coaxial Wood
[R] Recessed Coaxial Teflon

2-3 — Measurement Electrode

[33] pH, HT-3 Rugged Dome Bulb
[43] pH, HT-4 High pH bulb (for pH 13 and above)
[PB] ORP, Platinum Band

4 — Temperature Compensator: (for direct input into following manufacturer’s preamp/instrument)

[0] T.C. not required
[1] 3K Ohms for most older Models of TBI/Bailey, Uniloc, and other US manufacturers
[9] 301 Ohms for older Great Lakes Models: 60, 70, 90, 570, and 690
[D] Pt 100 Ohms for Beckman Model SoluComp, TBI/Bailey (ABB) TB82 & TB84, Uniloc 1054, Foxboro 870 & 874, Yokogawa, and most European Models
[H] Pt 1000 Ohms for Yokogawa, Conducta, Polymetron, LTH, & many European models

5 — Cable Type:

[A] Low Noise Coax ( < 80º C service ) – for more than 7 ft.
[E] Jacketed Coax w/ TC leads ( < 80º C service ) – for more than 7 ft.
[T] Teflon Coax ( > 80º service ) for more than 7 ft.
[U] Jacketed Teflon Coax w/TC leads ( > 80º service ) for more than 7 ft.

6-7 — Cable Length:

[07] 7 ft. is standard length
[XX] Specify length (in feet) above 7 ft. standard length

8-9 — Required Sensor Connectors:

[FB] BNC for pH and ferrules on all other leads (for use with Terminal Block or Terminal Strip)
[BC] BNC for pH and ORP only (no T.C.)
[FF] All Ferrule connectors ( for use with Terminal block or Terminal Strip)

ST857 Retraction DynaProbe pH and Redox Sensors

Ordering Information

Specification