Model 59

Model 59
Relays
Series 59 Derivative Relays
Introduction
Features & Benefits
Force-balance principle produces a proportional output
for pneumatic circuit flexibility
Derivative action compensates for process and measurement
lags for stable pneumatic control
Description
The Series 59 Derivative Relays are pneumatic relays that
operate on the force-balance principle. As such, they
produce an output equal to the input signal plus or minus an
amount proportional to the rate of input change.
The direct derivative output is the input signal plus an
amount proportional to the rate of the input change. Inverse
derivative output is the input minus an amount proportional to
the rate of the input change. Since the magnitude of the
derivative response is proportional to the rate of input change,
a steady rate of input change will make the output lead
(or lag) the input by a definite time. This lead (or lag) time is
the derivative time.
The Model 59 is a 3 mode controller which includes an integral
derivative section, where the derivative action on the input
precedes proportional and reset responses. This arrangement,
which is the only one that can prevent overshooting on startup, also provides the most effective control following any large
load change.
Minimum Output Pressure
0.3 psig with 20 psig supply
Input/Output Ratio
Specifications
1:1 (±0.5%) for steady state conditions
Operating Range
Response Level
3-15 psig normal
(50 psig maximum for input and output)
0.01% of full scale
Supply Pressure
Less than 0.08 scfm at balance
Normal: 20 psig
Minimum: 3 psig above maximum output
Maximum: 60 psig
Pneumatic
Maximum Overload Protection
Ambient Temperature Limits
100 psig to any connection
- 40 to 180°F (- 40 to 82°C)
Air Consumption
7
Connections: 1/4" NPT
7.17
Relays
Series 59 Derivative Relays
Technical data
Mounting Dimensions
Model Designation
Model
Number
Derivative
Action
Derivative
Gain
59D
Direct
59DF
Direct, Fast
59DH1,2 Direct High Gain
59R
Inverse
59RF
Inverse, Fast
Time
(MINUTES)
6:1
.05-20
6:1 .005-2.0
30:1 .05-20
1:6
.05-20
1:6 .005-2.0
Derivative
Needle Valve
Graduations
0.5-20
.01-5
.05-20
.05-20
.01-5
7
1) Model 59DH cannot be converted to an inverse unit.
2) The derivative time of the Model 59DH may be further increased by adding an external volume chamber that connects into the side of the derivative unit.
This volume chamber increases the needle valve setting by a factor of ten.
7.18
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