Rosemount Analytical 389 Specifications
Rosemount™ 389/389VP
General Purpose pH/ORP Sensors
Product Data Sheet
June 2017
LIQ-PDS-389
Dependable pH/ORP measurements to solve your process needs
Rosemount 389/389VP sensors are suitable for use in a wide variety of applications. Reliably measure pH or Oxidation/Reduction
Potential of aqueous solutions in pipelines, open tanks, and ponds. Rosemount 389/389VP sensors are ideal for use in process
solutions containing poisoning ions.
Rosemount 389/389VP General Purpose pH/ORP Sensors
Overview
Reliability Meets Robustness
A triple junction reference prolongs sensor life and protects
against poisoning ions such as ammonia, chlorine, cyanides,
and sulfides.
Enhanced performance and increased life with cracking
resistant glass.
Available with a glass electrode option for high pH
applications.
Superior chemical resistance provided by a rugged Tefzel
body with Viton O-rings.
Ease of Installation
June 2017
The molded sensor body features 1 in. MNPT front and rear
facing process connections for insertion, submersion, and
flow-through applications.
Variopol (VP6) cable connection option, for quick
cable-to-sensor release, eliminates cable twisting (389VP).
Maintenance Made Simple
Automatic recognition of pH sensors by Rosemount
transmitters: 56, 1056, 1057, and 1066 with integral SMART
preamplifier.
pH calibration data is stored which allows sensors to be
calibrated in advance for “Plug and Play” installations in the
field.
Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Product Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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June 2017
Rosemount 389/389VP General Purpose pH/ORP Sensors
Ordering Information
The Rosemount 389 and 389VP General Purpose pH/ORP Sensors are housed in a
molded Tefzel body with 1 in. MNPT forward and rear facing threads suitable for
insertion, submersion, or flow through installation. The sensors can be configured with
a general purpose pH, high pH, or platinum ORP electrode. Rosemount 389/389VP
sensors are offered with SMART preamplifiers for pH measurements and standard
integral preamplifiers for ORP measurements. These sensors may be configured
without a preamplifier but must be used with a remote preamplifier (j-box or
transmitter). Automatic temperature compensation is standard. Sensors are available
with either an integral cable connection (389) or Variopol (VP6) connector (389VP).
Variopol cables sold separately (see
Table 1. Rosemount 389 pH/ORP Sensor ordering information
Model Sensor Type
389 pH/ORP Sensor
Accessories ).
Preamplifier/Cable
01 Integral Preamplifier, 25 ft Cable
02 No Preamplifier, 15 ft Cable
(1)
Combination Electrode
10 pH - GPLR Glass
11 pH - High pH Glass
12 ORP
Transmitter/TC Compatibility
50 1181, 1050, 1060 (code -01 or -02)
54 1054A/B, 81, 2081 (code -01 or -02); for 54, 56, 1055, 1056, 1057, 1066, 5081, 6081, XMT (code -02 only)
55 54, 56, 1055, 1056, 1057, 5081, 6081, and XMT (code -01 only)
Optional
_ No Selection
62 Cable without BNC for Models: 54, 54, 1055, 1056, 1057, 1066, 5081, 6081, XMT (codes -02 and -54 only)
Typical Model Number: 389-02-10-54-62
1. Preamplifier is SMART if selected with pH electrode and option 55 only. Preamplifier is standard for ORP electrodes and for options 50 and 54.
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Rosemount 389/389VP General Purpose pH/ORP Sensors
Table 2. Rosemount 389VP pH/ORP Sensor ordering information
Model Sensor Type
389VP pH/ORP Sensor
Combination Electrode
10 pH - GPLR Glass
11 pH - High pH Glass
12 ORP
Transmitter/TC Compatibility
50 1181, 1050, 1060 (code -01 or -02)
54 1054A/B, 81, 2081 (code -01 or -02); for 54, 56, 1055, 1056, 1057, 1066, 5081, 6081, XMT (code -02 only)
55 54, 56, 1055, 1056, 1057, 5081, 6081, and XMT (code -01 only)
Preamplifier Option
_ No Preamplifier
70 SMART Preamplifier
(1)
June 2017
Typical Model Number: 389VP-10-55-70
1. Only available with -10, -11, and -55 options.
4
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June 2017
Rosemount 389/389VP General Purpose pH/ORP Sensors
Specifications
Table 3. Percent Linearity Over pH Range
pH Range GPLR Glass (-10) High pH Glass (-11)
0 to 2 pH 94% 94%
2 to 12 pH 99% 97%
12 to 13 pH 97% 98%
13 to 14 pH 92% 98%
Table 4. Rosemount 389/389VP pH/ORP Sensor specification
Measurement Range
pH 0 to 14
ORP -1500 to +1500 mV
Temperature Range
0 to 85 °C (32 to 185 °F)
Automatic temperature compensation: 0 to 85 °C (32 to 185 °F)
Maximum Pressure
100 psig (790 kPa [abs]) at 65 °C (150 °F) – see Figure 1
Materials of Construction
Sensor Body Tefzel
pH Electrode Glass
ORP Electrode Platinum
Junction Ceramic
O-ring Viton
Process Connections
Front Facing 1 in. MNPT
Rear Facing 1 in. MNPT
Cable
389 Integral Preamplifier – 25 ft (7.8 m); No Preamplifier – 15 ft (4.6 m)
389VP Use 24281-XX, 2.5 ft (0.8 m) to 100 ft (31m) (see
Accessories )
Weight/Shipping Weight
0.45 kg/0.9 kg (1 lb/2 lbs)
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